MD Helicopters 369 Series User manual

Temporary Revision
369/500/600 Series
Manual: CSP−HMI−2, Handbook of Maintenance Instructions
Models: 369D/E/FF −500/600N Helicopters
Issued: 31 October 1990
Revision 39: 11 April 2007
TR 07−001: 09 July 2007
FILING INSTRUCTIONS:
(1) Before inserting this change, ensure the manual is current.
Check the existing List of Effective Pages in the manual to ensure all prior revisions are inserted.
(Do not insert this revision if prior revisions are not inserted).
(2) Insert this page in front of Page A of the List of Effective Pages (LOEP).
(3) Incorporate this change by removing old pages and inserting new pages as indicated below.
Temporary Revision
Number / Date Section Page Page Revision
*TR 07−001 / 09 July 2007 05−20−00 3 and 4 TR 07−001
53 i thru vi TR 07−001
53−50−30 205 thru 212 TR 07−001
* Signifies latest Temporary Revision.

This Page Intentionally Left Blank

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
05−20−00 Page 3
TR 07−001
Form HOE005 (Rev 04/07)
Table 1. 100−Hour or Annual Inspection (Cont.)
Registration No. Serial No.
Helicopter Hours Torque Events
Model InitialChap/SectRequirement
500/600N * Thruster cones and tip cap (500N only) for damage and security. Inspect
for wear between thruster cones and tailboom at points of contact.
* Using a flashlight and 10X magnifying glass, inspect horizontal stabilizer
mounting brackets for cracks (pay particular attention to the forward inboard
legs) (Ref. Tailboom Inspection).
* Using a bright flashlight, inspect fore and aft radii of the lower portion of
the three upper slot bridges for cracks, illuminate area under the flap. The
flap may be raised slightly, using finger pressure only, to aid in checking this
area (Ref. Tailboom Inspection).
* Using a bright light and 10X magnifying glass, inspect the four tailboom
attachment lugs for cracks and fiber damage. Pay particular attention to area
on top of the lug from the radius block to 2 inches aft (Ref. Tailboom
Inspection).
* Tailboom closeout fairings for security of attachment hardware. Inspect
for damage and chafing between closeout fairing and tailboom.
53−40−30
53−50−30
369D/E/FF Horizontal stabilizer for:
* Skin damage and loose rivets.
* Tip plates for damage. Check for secure attachments (Ref. Horizontal
Stabilizer and Tip Plates Inspection).
53−50−10
500/600N Horizontal stabilizer for:
* Skin damage and loose rivets.
* Mounting fittings for cracks and security.
* Stabilizer attach bolts for security.
53
369D/E/FF Vertical stabilizer for:
* Damage to leading and trailing edges and damaged stressed side panels
(no repair of side panels permitted).
* Mounting fittings for cracks and security.
* Tail skid for obvious damage and security (Ref. Vertical Stabilizer
Inspection).
53−50−10
500/600N Vertical stabilizers for:
* Damage to leading or trailing edges and damaged side panels.
* Cracks in skin, no cracks permitted (pay particular attention to areas
around mounting bolts).
* Stabilizer attach bolts for security.
* Stabilizer mount bushings for wear, security and correct installation.
* Excess play in control linkage, bearings and security of attaching
hardware.
53

CSP−HMI−2 MD Helicopters, Inc.
MAINTENANCE MANUAL
Page 4
Revision 35 05−20−00 Form HOE005 (Rev 04/07)
Table 1. 100−Hour or Annual Inspection (Cont.)
Registration No. Serial No.
Helicopter Hours Torque Events
Model InitialChap/SectRequirement
LANDING GEAR
ALL Landing gear skid tubes and fairings for:
* Wear and damage in excess of permissible limits.
* Upper fairing fillets for freedom of movement and general condition.
* Strut attachment points for security and pivot (swivel) bearings for
excessive play.
* Landing gear dampers for correct extension, security of attachment and
for signs of fluid leakage. Pivot bearings for excessive play.
* Passenger steps for security and damage.
32
369D/E/FF
500N
Remove landing gear fairing fillets and visually inspect landing gear strut
assemblies for cracks and damage.
369D/E/FF
500N
For aircraft 369D; 001 & subs, 369E; 0001 thru 0528, 369FF; 0001 thru 0114
and 500N; 001 thru 077: Remove plug button from inboard of fairing
assembly. Using a bright light and 10X magnifying glass, inspect rivet hole in
underside of strut for cracks. If crack is found, strut must be scrapped.
CABIN
ALL Compartment heat and anti−icing valve controls for:
* Easy and correct operation and rigging.
* Heating system heat diffusers for security.
21
ALL * Seat belts for condition and security.
* Inertia reels for condition and proper extension/retraction.
25
ALL Pilot/copilot controls for:
* Wear, looseness and general condition of control rods and rod end
bearings.
* Quick−release pins for condition.
* Cyclic, collective and anti−torque controls for free movement.
* Cyclic trim actuators for security.
* Collective torque tube, support bracket and bungee support bracket for
evidence of cracks, gouges or other visible damage in attach lug and bungee
support bracket attach areas; gaps between bracket and cradle cap of
collective torque tube (use bright light and mirror).
*N
1power controls for obvious damage.
* Check for minimum cyclic friction adjustment (resistance to turning spring
with fingers).
* Flight control system one−way lock (Uniloc) for oil leakage, condition and
security. Fluid reservoir 1/2 −3/4 full; replenish if low.
67
76

CSP−HMI−2
MD Helicopters, Inc.
MAINTENANCE MANUAL
53 Contents Page i
TR 07−001
TABLE OF CONTENTS
Para/Figure/Table Title Page
53−00−00 Fuselage A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Fuselage − General 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Stressed Sheet Metal Panels 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Stressed Sheet Metal Panel Inspection 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Non−Stressed Sheet Metal Panels 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Negligible Damage Inspection 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 201. Negligible Damage Inspection − Fuselage 202. . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Fuselage − Major Sections 203. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Fuselage − Model 600N 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53−10−00 Windshields and Aft Section Windows A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Windshields 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Aft Section Windows 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Aft Section Windows Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Aft Section Windows Removal 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Aft Section Windows Installation 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Windshield Frame Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. New−Style Windshield Installation 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Windshield Inspection 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Windshield Repair 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Water Leak Prevention 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Geon Strips Repair 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 201. Negligible Damage of Canopy/Windshield 202. . . . . . . . . . . . . . . . . . . . . . .
Figure 201. (Round Nose) Windshields and Aft Section Windows 203. . . . . . . . . . . . .
Figure 202. (Extended Nose) Windshield and Aft Section Windows 204. . . . . . . . . . .
Figure 203. Windshield Installation (New Style) 205. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 204. (Extended Nose) Windshields and Aft Section Windows
(New Style) 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53−20−00 Lower Center Fuselage A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Lower Center Fuselage − General 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Lower Center Fuselage Inspection 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Fuel Tank Support Skin Inspection (Fuel Cells Removed) 201. . . . . . . . . . . . . . . . . . . . .
4. Fuel Tank Support Skins Repair (Fuel Cells Removed) 201. . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Lower Center Fuselage (369D/E/FF − 500N) 202. . . . . . . . . . . . . . . . . . . .

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TABLE OF CONTENTS (Cont.)
Para/Figure/Table Title Page
Figure 202. Lower Center Fuselage (Model 600N) 203. . . . . . . . . . . . . . . . . . . . . . . . . .
53−30−00 Upper Aft Section Fuselage (369D/E/FF) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Upper Firewall Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Firewall and Plenum Chamber Panels Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Soundproofing Insulation − Firewall and Plenum Chamber
(Sheet 1 of 2) 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Mast Support Structure 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Mast Support Structure Inspection 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Firewalls 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Firewalls Inspection 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Firewall and Aft Section 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Firewall, Station 124.00 Insulation and Soundproofing 205. . . . . . . . . . . . . . . . . . . . .
5. Firewall and Plenum Chamber Soundproofing Panel Inspection 205. . . . . . . . . . . . . . .
A. Engine Air Inlet Fairing 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Engine Air Inlet (Plenum Chamber) Inspection 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Upper Aft Section General Repair 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Aft Fuselage Fittings 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Aft Fuselage Fittings General Repair 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Aft Section Strut Repair 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Silver Brazing Procedure − Upper Firewall Shell Patch 206. . . . . . . . . . . . . . . . . . . . . . .
Figure 203. Major Bulkheads and Structural Members − Aft Fuselage 207. . . . . . .
9. Plenum Chamber Hole Sealing 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Forward Fuselage Section Structure Rework 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Transmission Compartment Air Baffle, Seal and Cover Initial Installation 209. . . . . .
Table 201. Weight and Balance Data 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 204. Forward Fuselage Section Structure Rework 211. . . . . . . . . . . . . . . . . . .
Figure 205. Installation of Air Baffle, Seal and Cover Assemblies
(Sheet 1 of 2) 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53−30−30 Upper Aft Section Fuselage (500/600N) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Engine/Anti−Torque Air Inlet Fan Fairings 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Engine Air and Fan Inlet (Plenum Chamber Area) Inspection 201. . . . . . . . . . . . . . . . .
Figure 201. Upper Aft Section (500N) 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Upper Aft Section Fuselage (600N) 203. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Upper Aft Section General Repair 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Upper Fuselage Controls Fairing (600N) 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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TABLE OF CONTENTS (Cont.)
Para/Figure/Table Title Page
4. Upper Fuselage Controls Fairing Replacement (600N) 204. . . . . . . . . . . . . . . . . . . . . . . .
A. Upper Fuselage Controls Fairing Removal 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Upper Fuselage Controls Fairing Installation 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Engine Inlet Fairings Replacement 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Engine Inlet Fairing Removal 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Engine Inlet Fairing Installation 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Anti−Torque Fan Air Inlet Screen Replacement 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Fan Air Inlet Screen Removal 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Fan Air Inlet Screen Installation 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Fan Hub and Transmission Cover Fairing Replacement 204. . . . . . . . . . . . . . . . . . . . . . .
A. Fan Hub and Transmission Cover Removal 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Fan Hub and Transmission Cover Installation 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Engine Plenum Access Cover Replacement 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Engine Plenum Access Cover Removal 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Engine Plenum Access Cover Installation 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Tailboom Attach Fitting Inspection 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 203. Tailboom Attach Fitting Inspection 206. . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Lower Longeron Inspection (L158, R158) 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Forward Upper Longeron Inspection (L137, R137) 207. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 204. Inspection Hole Locations 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12. Control Tunnel (FS 78.50) Beam Inspection 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 205. Control Tunnel (FS 78.50) Beam Inspection 209. . . . . . . . . . . . . . . . . . . .
53−40−00 Tailboom (369D/E/FF) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Tailboom − General 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Tailboom Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Tailboom Removal 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Tailboom Installation 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Tailboom Assembly and Tailboom Extension 202. . . . . . . . . . . . . . . . . . . .
3. Tailboom Extension Replacement (369FF) 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Tailboom Inspection 203. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Tailboom Repair 203. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Tailboom Installation and Removal 204. . . . . . . . . . . . . . . . . . . . . . . . . . . .
53−40−30 Tailboom (500/600N) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Tailboom Description 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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2. Tailboom Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Tailboom Removal 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Tailboom Assembly (Sheet 1 of 3) 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Tailboom Installation 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Tailboom Inspection 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Tailboom Flap Inspection 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Tailboom Repair 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Stator Replacement 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Stator Removal 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Stator Installation 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Stator Blade Replacement 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Rotating Thruster Cone Replacement 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Rotating Thruster Cone Removal 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Rotating Thruster Cone Installation 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Rotating Thruster Cone Inspection 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Stationary Thruster Cone Replacement 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Stationary Thruster Cone Removal 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Stationary Thruster Cone Installation 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Stationary Thruster Cone Inspection 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Conduit and Support Strap Rebonding 208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 203. Conduit and Support Strap Rebonding 209. . . . . . . . . . . . . . . . . . . . . . . . .
12. Horizontal Stabilizer Mount Fitting Replacement 210. . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. 500N3500−5 Cover Installation 211. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 204. 500N3500−5 Cover Installation 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14. Tail Skid Replacement 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Tail Skid Removal 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Tail Skid Installation 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 205. Tail Skid Installation 213. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53−50−10 Stabilizer (T−Tail) (369D/E/FF) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Stabilizer − General 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Stabilizer Troubleshooting 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Horizontal Stabilizer and Tip Plate Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Horizontal Stabilizer and Tip Plate Removal 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Horizontal Stabilizer and Tip Plate Installation 201. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Vertical Stabilizer Replacement 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CSP−HMI−2
MD Helicopters, Inc.
MAINTENANCE MANUAL
53 Contents Page v
TR 07−001
TABLE OF CONTENTS (Cont.)
Para/Figure/Table Title Page
A. Vertical Stabilizer Removal 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Vertical Stabilizer Installation 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Horizontal Stabilizer and Tip Plate Inspection 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Vertical Stabilizer Inspection 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Stabilizer T−Tail Removal and Installation 203. . . . . . . . . . . . . . . . . . . . .
6. Horizontal Stabilizer and Tip Plate Repair 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Vertical Stabilizer Repair 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Angle of Incidence Measurement 204. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 201. Horizontal Stabilizer Angle of Incidence 204. . . . . . . . . . . . . . . . . . . . . . . . .
9. Angle of Incidence Adjustment 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Horizontal Stabilizer Tab Weight Installation 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 202. Troubleshooting Tailboom and Tail Surfaces 205. . . . . . . . . . . . . . . . . . . . .
Figure 202. Horizontal Stabilizer Incidence Angle Measuring Tool 206. . . . . . . . . . .
Figure 203. Establishing Horizontal Stabilizer Angle of Incidence 206. . . . . . . . . . . .
Figure 204. Sealing − Vertical Stabilizer (0003D − 0286D) 207. . . . . . . . . . . . . . . . . .
53−50−30 Stabilizer (500/600N) A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Practices 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Stabilizers Description 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Horizontal Stabilizer Description 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Vertical Stabilizers Description 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Vertical Stabilizer Replacement 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Vertical Upper and Lower Stabilizer Removal 201. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Vertical Upper and Lower Stabilizer Installation 201. . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Horizontal Stabilizer Replacement 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Horizontal Stabilizer Removal 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Horizontal Stabilizer Installation 202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 201. Stabilizer Installation with YSAS (Sheet 1 of 2) 203. . . . . . . . . . . . . . . . .
4. Horizontal Stabilizer Eye Bolt Replacement 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Horizontal Stabilizer Eye Bolt Removal 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Horizontal Stabilizer Eye Bolt Installation 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Horizontal/Vertical Stabilizer Control Tube and Bellcrank Replacement 205. . . . . . . .
A. Horizontal/Vertical Stabilizer Control Tube and Bellcrank Removal 205. . . . . . . . . .
B. Horizontal/Vertical Stabilizer Control Tube and Bellcrank Installation 205. . . . . . .
6. Vertical Stabilizer Inspection 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Vertical Stabilizer Repair 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Horizontal Stabilizer Inspection 205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Vertical Stabilizer Torque Tube Replacement 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
Page vi
TR 07−001 53 Contents
TABLE OF CONTENTS (Cont.)
Para/Figure/Table Title Page
A. Vertical Stabilizer Torque Tube Removal 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Vertical Stabilizer Torque Tube Installation 206. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 202. Stabilizer Installation without YSAS 207. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 203. Vertical Stabilizer Installation with Expandable Bolts 208. . . . . . . . . . .
10. Horizontal Stabilizer Repair 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. Vertical Stabilizer Torque Tube and/or Bushing Replacement
(Non−Bonded Bushings) 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12. Vertical Stabilizer Torque Tube and/or Bushing Replacement
(Bonded Bushings) 209. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. Vertical Stabilizer Torque Tube Bushing Rework
(Non−Bonded Bushings to Bonded Bushings) 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14. Vertical Stabilizer Torque Tube Bearing Race Replacement 211. . . . . . . . . . . . . . . . . . . .
15. Stabilizer Troubleshooting 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 201. Troubleshooting Tailboom and Tail Surfaces 212. . . . . . . . . . . . . . . . . . . . .

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
53−50−30 Page 205
TR 07−001
4. Horizontal Stabilizer Eye Bolt
Replacement
A. Horizontal Stabilizer Eye Bolt Removal
(1). Remove horizontal stabilizer.
(2). Remove eye bolts by holding the flat
surface of eye bolt with a wrench and
removing nut.
B. Horizontal Stabilizer Eye Bolt Installation
(1). Install eye bolts in horizontal stabilizer,
the short eye bolts in the forward holes
and the longer eye bolts with spacer to
the aft holes of horizontal stabilizer.
(2). Torque eye bolts to 80 − 120 inch−
pounds (9.04 − 13.56 Nm) plus drag
torque.
(3). Install horizontal stabilizer.
5. Horizontal/Vertical Stabilizer Control Tube
and Bellcrank Replacement
(Ref. Figure 201 and Figure 202)
A. Horizontal/Vertical Stabilizer Control Tube
and Bellcrank Removal
(1). Remove horizontal stabilizer end tip
covers and center access cover for
access to bellcranks and control tubes.
(2). Remove cotter pin, nut, washer and bolt
from center bellcrank shaft. Index mark
bellcrank with grease pencil in relation-
ship to shaft. Disconnect bellcrank.
(3). Disconnect control tube from vertical
stabilizer torque tube bellcrank.
Remove controls from horizontal
stabilizer as required for maintenance.
B. Horizontal/Vertical Stabilizer Control Tube
and Bellcrank Installation
Refer to adjustment and test control rigging
during installation.
(1). Connect bellcrank to center bellcrank
shaft and install bolt, washers and nut.
Torque bolt to standard aircraft torque
values and install cotter pin.
(2). Install control tubes and bellcranks as
required, safety wire or cotter pin.
(3). Install center access plate with seven
screws and washers.
6. Vertical Stabilizer Inspection
(Ref. Figure 201 and Figure 202)
(1). Inspect skin for cracks, bonding
separation, delamanation and obvious
damage.
(2). Inspect stabilizer for freedom of
movement through pedal travel range,
check for clearance between vertical to
horizontal.
(3). Check mounting fitting holes for
elongation.
NOTE: Internal stabilizer fitting may display
cracking after installation of expandable
bolts. This cracking, internal fitting only, is
acceptable for continued service. Cracking
of the external skin from the mounting bolt
holes is unacceptable and stabilizer must be
removed from service and scrapped.
7. Vertical Stabilizer Repair
Refer to MDHI Field Service Representative.
8. Horizontal Stabilizer Inspection
(1). Inspect skin for cracks, bonding
separation, delamination and obvious
damage.
(2). Inspect mounting fitting and attach-
ment hardware for condition.
(3). Inspect center access panel and nut
plate fasteners for condition, end tip
plate access covers and position lights
for condition.
(4). Inspect vertical stabilizer torques tubes
for excessive axial and radial move-
ment, 0.010 inch (0.254 mm) axial end
play maximum allowable.
(5). Inspect torque tube bushings for wear
and security.
(6). If the bushings are not bonded to the
horizontal stabilizer, rework Vertical
Stabilizer Torque Tube Bushings.

CSP−HMI−2 MD Helicopters, Inc.
MAINTENANCE MANUAL
Page 206
TR 07−001 53−50−30
9. Vertical Stabilizer Torque Tube
Replacement
A. Vertical Stabilizer Torque Tube Removal
(1). Remove vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
(2). Remove horizontal tip plate access
cover and disconnect YSAS torque tube
(if installed) from vertical stabilizer
bellcrank.
(3). Remove bellcrank from torque tube by
removing expandable bolt.
(4). Remove cotter pin, locknut and bushing
from torque tube. Remove torque tube
by lifting upward.
B. Vertical Stabilizer Torque Tube
Installation
(1). Slide torque tube from the top thru the
horizontal stabilizer.
(2). Apply one layer of teflon tape (CM726)
to threads of torque tube prior to
installing locknut.
(3). Install locknut, hand tighten and adjust
to a 0.005−0.010 inch (0.127−0.254 mm)
gap; Install cotter pin.
NOTE: When installing the bellcrank, opening
in bellcrank must face outboard.
(4). Install bellcrank, with opening facing
outboard, on torque tube and install
expandable bolt; Torque to 30 − 40
inch−pounds (3.39 − 4.52 Nm) plus
drag torque;Install cotter pin.
(5). Connect YSAS actuator to vertical
stabilizer torque tube bellcrank. Torque
nut to 30 − 40 inch−pounds (3.39 −
4.52 Nm) and install cotter pin.
(6). Install end plate access covers.
(7). Install vertical stabilizer (Ref. Vertical
Stabilizer Replacement).

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
53−50−30 Page 207
TR 07−001
RIGHT
CONTROL ROD
AFT
CONTROL ROD
LEFT
CONTROL ROD
NOTE 1
GURNEY FLAPS
G53−5003−3B
NOTE:
1. EXTRA WASHER BETWEEN RADIUS BLOCK
AND SPACER.
2. OPENING IN BELLCRANK ALWAYS FACES
OUTBOARD (LH AND RH SIDES).
EARLY 600N SHOWN
NOTE 2
Figure 202. Stabilizer Installation without YSAS

CSP−HMI−2 MD Helicopters, Inc.
MAINTENANCE MANUAL
Page 208
TR 07−001 53−50−30
53−5007
WASHER
BOL
T
NUT
COTTER PIN
THICK WASHER
WASHER
BOL
T
MAX. DIA. O.254 IN. (6.4516 MM)
(8 PLCS) EACH TORQUE TUBE
TORQUE TUBE
EXPANDABLE DIAMETER
BOLT INSTALLATION
EXPANDABLE
ELEMENTS
VERTICAL STABILIZER
SPACER
S
NUT
COTTER
PIN
THICK WASHER
SPACER
S
WASHER
(OPTIONAL)
WASHER
(OPTIONAL)
NOTE:
THE BOLT, WASHER, THICK WASHER, SPACERS AND NUT ARE
COMPONENTS OF THE EXPANDABLE DIAMETER BOLT ASSEMBLY.
THICK
WASHER SPACERS (2)
THIN WASHER
THIN WASHER
EXPANDABLE
ELEMENTS
NON EXPANDABLE
ELEMENT
TORQUE TUBE
Figure 203. Vertical Stabilizer Installation with Expandable Bolts

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
53−50−30 Page 209
TR 07−001
10. Horizontal Stabilizer Repair
Refer to MDHI Field Service Representative.
11. Vertical Stabilizer Torque Tube and/or
Bushing Replacement (Non−Bonded
Bushings)
(Ref. Figure 201) The following procedure is for
replacing the early style (non−bonded) torque
tube bushings.
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM726 Tape, teflon
(1). Remove vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
(2). Remove horizontal tip plate access
cover and disconnect YSAS torque tube
(if installed) from vertical stabilizer
bellcrank.
(3). Remove bellcrank from torque tube by
removing expandable bolt.
(4). Remove cotter pin, locknut and bushing
from torque tube. Remove torque tube
by lifting upward.
(5). Remove bushing from bearing race of
torque tube.
(6). Install one bushing on bearing race of
torque tube and insert torque tube
through fitting of horizontal stabilizer
from the top downward.
(7). Apply one layer of teflon tape (CM726)
to threads of torque tube prior to
installing locknut.
(8). Install bushing and locknut, hand
tighten locknut and adjust to a
0.005−0.010 inch (0.127−0.254 mm)
gap; Install cotter pin.
NOTE: Ensure shouldered bushings are
installed in bellcrank.
(9). Install bellcrank on torque tube and
install expandable bolt and washers;
Torque to 30 − 40 inch−pounds (3.39 −
4.52 Nm) plus drag torque;Install
cotter pin.
(10). Connect YSAS actuator to vertical
stabilizer torque tube bellcrank. Torque
nut to 30 − 40 inch−pounds (3.39 −
4.52 Nm) and install cotter pin.
(11). Install end plate access covers.
(12). Install vertical stabilizer (Ref. Vertical
Stabilizer Replacement).
12. Vertical Stabilizer Torque Tube and/or
Bushing Replacement (Bonded Bushings)
(Ref. Figure 201) The following procedure is for
replacing the current style (bonded) torque
tube bushings.
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM222 1,1,1−Trichloroethane
CM402 Adhesive
CM726 Tape, teflon
CM802 Abrasive cloth, aluminum oxide
(1). Remove vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
(2). Remove horizontal tip plate access
cover and disconnect YSAS torque tube
(if installed) from vertical stabilizer
bellcrank.
(3). Remove bellcrank from torque tube by
removing expandable bolt.
(4). Remove cotter pin, locknut and bushing
from torque tube. Remove torque tube
by lifting upward.
In the following steps, care must
be taken to not damage the fi-
bers of the horizontal stabilizer.
(5). Remove bushing(s) from horizontal
stabilizer by gently working a sharp
scraper between bushing and stabilizer.
(6). Sand excess sealant from horizontal
stabilizer taking care not to disturb the
composite fibers of the stabilizer.
(7). Clean faying surfaces of horizontal
stabilizer, where bushings are to be
CAUTION

CSP−HMI−2 MD Helicopters, Inc.
MAINTENANCE MANUAL
Page 210
TR 07−001 53−50−30
bonded, with 1,1,1−trichloroethane
(CM222).
(8). Wipe dry using a clean dry rag and
then allow to air dry for 15 minutes.
(9). Lightly abrade the faying surface of the
new bushings with abrasive cloth
(CM802) until all gloss is removed.
Wipe clean with 1,1,1−trichloroethane.
(10). Wipe dry using a clean dry rag and
then allow to air dry for 15 minutes.
(11). Mix adhesive (CM402) according to
manufacturers instructions. Apply
adhesive within 2 hours of cleaning.
(12). Apply a thin uniform layer of adhesive
to faying surfaces.
Do not apply too much pressure,
damage to horizontal stabilizer
may occur.
(13). Press the faying surfaces firmly
together and maintain contact pressure
or apply 50 psi (3.45 kPa) maximum for
24 hours at ambient temperature.
(14). Using 1,1,1−trichloroethane, clean
excess adhesive from parts before
adhesive has had time to cure.
(15). Slide torque tube from the top thru the
horizontal stabilizer.
(16). Apply one layer of teflon tape (CM726)
to threads of torque tube prior to
installing locknut.
(17). Install locknut, hand tighten and adjust
to a 0.005−0.010 inch (0.127−0.254 mm)
gap; Install cotter pin.
(18). Install bellcrank on torque tube and
install expandable bolt; Torque to 30 −
40 inch−pounds (3.39 − 4.52 Nm)
plus drag torque;Install cotter pin.
(19). Connect YSAS actuator to vertical
stabilizer torque tube bellcrank. Torque
nut to 30 − 40 inch−pounds (3.39 −
4.52 Nm) and install cotter pin.
(20). Install end plate access covers.
(21). Install vertical stabilizer (Ref. Vertical
Stabilizer Replacement).
13. Vertical Stabilizer Torque Tube Bushing
Rework (Non−Bonded Bushings to
Bonded Bushings)
(Ref. Figure 201) The following procedure is for
converting the vertical stabilizer torque tube to
the current 500N3980−3 bushings,
500N3970−3 locknuts and MS24665−361
cotter pins.
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM222 1,1,1−Trichloroethane
CM402 Adhesive
CM726 Tape, teflon
CM802 Abrasive cloth, aluminum oxide
(1). Remove vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
(2). Remove cotter pins, locknuts and
bushings, and scrap. Remove torque
tube by lifting upward. Remove bushing
and scrap.
(3). Clean faying surfaces of horizontal
stabilizer, where bushings are to be
bonded, with 1,1,1−trichloroethane
(CM222).
(4). Wipe dry using a clean dry rag and
then allow to air dry for 15 minutes.
(5). Lightly abrade the faying surface of the
new bushings with abrasive cloth
(CM802) until all gloss is removed.
Wipe clean with 1,1,1−trichloroethane.
(6). Wipe dry using a clean dry rag and
then allow to air dry for 15 minutes.
(7). Mix adhesive (CM402) according to
manufacturers instructions. Apply
adhesive within 2 hours of cleaning.
(8). Apply a thin uniform layer of adhesive
to faying surfaces.
Do not apply too much pressure,
damage to horizontal stabilizer
may occur.
(9). Press the faying surfaces firmly
together and maintain contact pressure
or apply 50 psi (3.45 kPa) maximum for
24 hours at ambient temperature.
CAUTION
CAUTION

CSP−HMI−2MD Helicopters, Inc.
MAINTENANCE MANUAL
53−50−30 Page 211
TR 07−001
(10). Using 1,1,1−trichloroethane, clean
excess adhesive from parts before
adhesive has had time to cure.
(11). Slide torque tube from the top thru the
horizontal stabilizer.
(12). Apply one layer of teflon tape (CM726)
to new 500N3970−3 locknut.
(13). Install locknut, hand tighten and adjust
to a 0.005−0.010 inch (0.127−0.254 mm)
gap; Install MS24665−361 cotter pin.
(14). Install bellcrank on torque tube and
install expandable bolt; Torque to 30 −
40 inch−pounds (3.39 − 4.52 Nm)
plus drag torque;Install cotter pin.
(15). Install end plate access covers.
(16). Install vertical stabilizer (Ref. Vertical
Stabilizer Replacement).
14. Vertical Stabilizer Torque Tube Bearing
Race Replacement
(Ref. Figure 201) The following procedure is for
removal of the bearing race from the vertical
stabilizer torque tube. Some special tools will
need to be manufactured for this procedure.
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM234 Solvent, dry−cleaning
CM318 Primer
CM730 Tape, duct
Special Tools
(Ref. Section 91−00−00)
Item Nomenclature
N/A Arbor press
(1). Remove vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
(2). Remove vertical stabilizer torque tubes
(Ref. Vertical Stabilizer Torque Tube
Replacement).
(3). Fabricate the following tool for bearing
race removal.
(a). Locate a steel plate of approximately
0.250 inch (6.35 mm) thickness.
(b). Drill a 1.510 inch (38.3540 mm) hole
in the plate.
(c). Deburr edges of hole to prevent
damage to torque tube.
(d). Apply tape (CM730) to tool to prevent
damage to bearing race.
(4). Insert torque tube through the removal
tool and install on arbor press.
In the following steps, care must
be taken to not damage the hori-
zontal stabilizer torque tube.
(5). Place suitable device over torque tube
end to protect tube from damage from
arbor press.
(6). Remove bearing from the torque tube
by gently pressing torque tube through
the removal tool.
(7). Using solvent (CM234), clean primer
residue from torque tube.
(8). Inspect torque tube for damage to
bearing race contact surface.
(9). Fabricate the following tool for bearing
race installation.
(a). Locate a steel plate of approximately
0.250 inch (6.35 mm) thickness.
(b). Drill a 1.390 inch (35.306 mm) hole
in the plate.
(c). Deburr edges of hole to prevent
damage to torque tube.
(d). Apply tape (CM730) to tool to prevent
damage to bearing race.
(10). Insert bearing race into tool and mount
on arbor press.
(11). Coat torque tube bearing race mating
surface with primer (CM318).
In the following steps, care must
be taken to not damage the the
horizontal stabilizer torque tube.
(12). Place suitable device over torque tube
end to protect tube from damage from
arbor press.
CAUTION
CAUTION

CSP−HMI−2 MD Helicopters, Inc.
MAINTENANCE MANUAL
Page 212
TR 07−001 53−50−30
In the following step, ensure
bearing race is not cocked on
torque tube, this will cause non−repairable
damage to bearing race and torque tube.
(13). While primer is wet, press torque tube
down through the bearing race until
bearing race is tight against flange on
torque tube.
(14). Inspect bearing race flanged surface to
ensure no warpage occurred during
installation.
(15). Reinstall vertical stabilizer torque
tubes (Ref. Vertical Stabilizer Torque
Tube Replacement).
(16). Reinstall vertical stabilizers (Ref.
Vertical Stabilizer Replacement).
15. Stabilizer Troubleshooting
(Ref. Table 201)
Table 201. Troubleshooting Tailboom and Tail Surfaces
Symptom Probable Trouble Corrective Action
High frequency vibration Fan assembly out of balance Re−balance fan assembly.
Loose fan blades Replace and re−balance fan assy.
Loose bolts/nuts on Horizontal or
Vertical stabilizer
Inspect mounting hardware; adjust or
replace as necessary.
NOTE:High frequency vibrations in helicopter can be caused by components in other systems (Ref. Sec.
64−00−00, 63−25−10, 63−25−30 and 71−00−00).
CAUTION