ENSTROM 280F Series User manual

ENSTROM 280F
OPERATORS MANUAL
AND
F.A.A. APPROVED
ROTORCRAFT FLIGHT MANUAL
REPORT NO. 28-AC-019
TYPE CERTIFICATE NO. HlCE
HELICOPTER SERIAL NO.------
HELICOPTER REGISTRATION NO. ____ _
THIS MANUAL MUST BE CARRIED IN THE HELICOPTER AT
ALL TlMES. SECTIONS 2,3,4, AND 5 ARE F. A.A. APPROVED.
SECTION
10 INCLUDES SUPPLEMENTS TO THE TYPE
CERTIFICATE WHICH ARE F. A.A. APPROVED IF SO DESIGNATED.
FOR MANAGER
CHICAGO AIRCRAFT CERTIFICATION OFFICE
CENTRAL
REGION
FEDERAL AVIATION ADMINISTRATION
DATE= DEC.31,1980
REVISED: Novernber. 7,1989
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280F Page: i
Report No: 28-AC-019
Date: 2/14/17
TABLE OF CONTENTS
AND
LIST OF EFFECTIVE PAGES
SECTION PAGE
Manual Cover Dated December 31, 1980
as revised
Table of Contents and List of i thru ii
Effective Pages
Log of Supplements iii
Log of Pages and Revisions iv thru vi
EASA Log of Revisions vii
EASA Log of Supplements viii
1 General 1.0 thru 1.5
2 Operating Limitations – FAA Approved 2.0 thru 2.7
3 Emergency and Malfunction Procedures 3.0 thru 3.11
FAA Approved
4 Normal Procedures 4.0 thru 4.13
5 Performance – FAA Approved 5.0 thru 5.12
6 Weight and Balance 6.0 thru 6.16
7 Aircraft and Systems Description 7.0 thru 7.8
8 Inspections, Maintenance, Servicing, 8.0 thru 8.15
Storage and Handling
9 Operational Information 9.0
10 Supplements 10.0
Supplement 1 10.1.1 thru 10.1.13
Wet/Dry Dispersal System
Supplement 2 10.2.1 thru 10.2.10
Float Landing Gear
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
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280F Page: ii
Report No: 28-AC-019
Date: 2/14/17
SECTION PAGE
10 Supplements - Continued
Supplement 3 10.3.1 thru 10.3.6
External Loads
Supplement 4 10.4.1
Snowshoe
Supplement 5 10.5.1
(Reserved)
Supplement 6 10.6.1
Right Side Pilot Configuration
Supplement 7 10.7.1
(Reserved)
Supplement 8 10.8.1 thru 10.8.9
Emergency Float Landing Gear
Supplement 9 10.9.1
(Reserved)
Supplement 10 10.10.1
(Reserved)
Supplement 11 10.11.1 thru 10.11.11
(Reserved)
Supplement 12 10.12.1
(Reserved)
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level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

280F Page: iii
Report No: 28-AC-019
Date: 2/14/17
LOG OF SUPPLEMENTS
SUP.
NO DESCRIPTION DATE FAA APPROVED
1 Wet/Dry Dispersal System 12-31-80 C. E. Arnold
2 Float Landing Gear 12-31-80 C. E. Arnold
3 External Loads 12-31-80 C. E. Arnold
4 Snowshoe 12-31-80 C. E. Arnold
5 (Reserved)
6 Right Side Pilot Configuration 6-26-81 C. E. Arnold
7 (Reserved)
8 Emergency Float Landing Gear 11-20-81 C. E. Arnold
9 (Reserved)
10 (Reserved)
11 Auxiliary Fuel Tank 9-23-83 J. Hannen
12 Engine Exhaust Muffler 7-16-86 P. Moe
APPROVED FOR MANAGER CHICAGO AIRCRAFT CERTIFICATION OFFICE,
CENTRAL REGION
FEDERAL AVIATION ADMINISTRATION
FAA Approved: March 28, 2017
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level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

9 THE ENSTROM HELICOPTER CORPORATrON
TWIN COUNTY AIRPORT•P.O.BOX 277. MENOMINEE, MICH. 4985B
PAGE iV
REPORT NO. 28-AC-019
DATE: ll/17/80
280F
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C::X::Z ::H.I)N
LOG OF PAGES AND REVISIONS
PAGES
FM
10-2-1
thru
10-2-6
AlL
i
~ii ,iv,
1.4,1.5,
2.1 thru
2.7,5.1
thru 5.1
6.1
6.2,6.8,
6.11'
10.1.5,
10.1.7,
10.1.8,
10.2.2,
10.2.3,
10.2. 7'
DESCRIPTION
Revised Float
Supplement to
Add
Restricted
Category
Envelope
Revised Basic Flight
Manual for Increased
Altitude Capability
in Both Normal and
Restricted Categories.
Additional Minor
Changes and Correction
Changes in this rev is io
are not indicated by
black vertical line
since all pages were
affected.
A 11 ows increased gross
weight to 2500 Jbs in
the
Normal Category
DATE
6/26/81
1/30/84
for SIN 1517 and Subse uent
or if the helicopter
meets the requirement~ 7/1/84
of Enstrom Specificati n
Drawin~ #28-100015
(continued on p. i v)
F.A.A. APPROVED
~-e~
* APPROVED FOR MANAGER, CHICAGO At RCRAFT CERTIFICATION OFFICE,
CENTRAL REG I ON
FEDERAL AVIATION ADMINISTRATION
NOTE: All changes are indicated by a black vertical line along right margin.
<I'!
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~~--------------------------------------------------------~
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
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-~ THE ENSTROM HELICOPTER CORPORATION
~ TWIN COUNTY AIRPORT• P.O. SOX 277, MENOMINEE, MICH. 49658
PAGE V
280f REPORT NO. 28-AC-019
-.
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DATE: ll/17/80
LOG OF PAGES AND REVISIONS
REV. NO. PAGES
.DESCRIPTION DATE
F.A.A. APPROVED
3
10.2.9,
lContinued)
(cont'd)
10.2.10,
10. 3.2'
7/1/84
10.3.3,
I
10.11.2
~
ll~h~~ 7
i
Added pages I
4 iv Revised
2.3
Added instruction
2.7
Added p1 aca rd
;z.q
4.6
Added instruction
4.7 Revised flt)G
7.3
Added paragraph
85
7.4
thru
Moved text
~~
7.8
8.12
Added autorotation rpm
8.13
Added figure
8.14
Added figure
5 . i
Changed/Added Pages
i i
.1\dded Suppl ernent
iii
Changed Page
'"
.v thru vi
Changed I Added Pages
1.4
Minor Correction
~~t.
2.3
Added Note
K
2.4
11oved Text
2.5
Moved Text
2.6
Moved Text
3.2
~li nor Changes '
3.3
~inor Changes h
3.g
Added Paragraph
4.7
tl.dded Cautions
4.11
Added Cautions
4.13
Added Page
5.1 Figures Redrawn,
thru rtinor Correction
;·!
~~rlnrl Paraoranh
APPROVED FOR MANAGER CHICAGO AIRCRAFT CERTIFICATION OFFICE,
CENTRAL REGION
FEDERAL AVIATION ADMINISTRATION
NOTE: All changes are indicated by a black vertical line along right margin.
~L-------------------------------------------------------------~
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

280F Page: vi
Report No: 28-AC-019
Date: 2/14/17
LOG OF PAGES AND REVISIONS
REV. NO PAGES DESCRIPTION DATE FAA APPROVED
5
(cont’d)
7.6 thru
7.8
8.5
8.15
10.12.1
Moved Text, Added 28-Volt System
Added 28-Volt System
Added Page
Added Page
Dec 14/88 Pat Moe
6 4.7, 4.9 Corrected Page Numbering Error Nov 7/89 Pat Moe
7
i
vi
3.10 thru
3.11
Revised List of Effective Pages
FAA Approval
Added Lamiflex Bearing Failure
Emergency Procedures
Jul 9/12
J. Miess
8
i, ii, iii, vi
vii, viii
4.1, 4.2,
4.3, 4.4
10.7.1
10.10.1
Updated
Added EASA Approval Logs
Added Fuel Management
Inspection Checklist
(Content removed, Reserved)
(Content removed, Reserved)
APPROVED FOR MANAGER CHICAGO AIRCRAFT CERTIFICATION OFFICE,
CENTRAL REGION
FEDERAL AVIATION ADMINISTRATION
FAA Approved: March 28, 2017
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
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280F Page: vii
Report No: 28-AC-019
Date: 2/14/17
EASA LOG OF REVISIONS
REV.
NO DATE EASA APPROVED
FAA APPROVAL ON
BEHALF OF EASA
1 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
2 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
3 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
4 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
5 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
6 Sep 28/03 Article 3, Commission Regulation (EU) 748/2012 N/A
7 Aug 17/15 FAA/EASA T.I.P.* G. J. Michalik
8 Aug 16/17 FAA/EASA T.I.P.*
* Section 3.2 T.I.P.
FAA Approved: March 28, 2017
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

280F Page: viii
Report No: 28-AC-019
Date: 2/14/17
EASA LOG OF SUPPLEMENTS
SUP.
NO DESCRIPTION DATE EASA APPROVED
FAA APPROVAL ON
BEHALF OF EASA
1 Wet/Dry Dispersal
System Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
2 Float Landing Gear Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
3 External Loads Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
4 Snowshoe Sep 28/03
Article 3, Commission
Regulation (EU) 748/2012 N/A
5 [Reserved]
6 Right Side Pilot
Configuration NOT EASA APPROVED
7 [Reserved]
8 Emergency Float
Landing Gear Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
9 [Reserved]
10 [Reserved]
11 Auxiliary Fuel Tank Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
12 Engine Exhaust Muffler Sep 28/03 Article 3, Commission
Regulation (EU) 748/2012 N/A
FAA Approved: March 28, 2017
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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THE ESSTROM HEUCOPTER CoRPORATION
TWlN COIJNN AIFIPCIFI7 ~ P 0 BOX :277. MENOMl"'EO:. MJCH'GAN ~&856
SECTION 1
GENERAL
280F
PAGE
REPORT NO.
DATE·
1.0
28-AC-019
11/17/80
~ Issued: 12/31/80
~l. .. ~R:e:vl~·s~e:d~:~l~/~3~0~/8:4:. .................................................... ...
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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··- THE ENSTROM HEliCOPTER CoRPORATION
TWit.! CQl.ti\IT'J' AIFIPOR.T • P.O -BOX :2)'7_ ME.t.JQI,.IINEE. l.fiC'iiGII.N ~!leU
SECTION 1 - GENERAL
I. INTRODUCTION
280F
PAGE
AEPORT NO
DATE
1.1
28-AC-019
11/17/80
This manu a1 contains the operating instructions, procedures and
1i mi tat ions for the Enstrom 280F he 1icopter. The manu a1 is divided into
two basic parts, the FAA approved Rotorcra ft Fl ight Manu a1 (RFM) and
Supp 1 ementa 1 Data provided by The Enstrom He 1icopter Corporation.
Sections 2 through 5 and the portions of Section 10 so designated make up
the FAA approved RFM. It is required by Federal Regulations that this
manual be carried in the helicopter at all times.
II. OWNER RESPONSIBILITIES
Maintaining the helicopter in an airworthy condition is the responsibility
of the
owner. {See Section 8 for required inspections.) To aid the owner
in this task The Enstrom Helicopter Corporation has a network of
Distributors, Oea 1 ers, and Service Centers. In addition to this
Operator's Manu a1, The Enstrom He 1icopter Corporation has the fo 11 owing
technical publications available for your helicopter:
A. 280F Maintenance Manual Supplement
B. 280F Parts Manual Supplement
C. Service Information Letters
D. Service Directive Bulletins
Information regarding
dea 1 er 1ocations, techni ca 1 pub 1ications and
revisions can be obtained by contacting:
Enstrom Helicopter Service
The Enstrom Helicopter Corporation
Twin County Airport
PO Box 277
Menominee, Michigan 49858
III. PILOT RESPONSIBILITIES
A. The pilot is res pons ib1e for determining that the helicopter is safe
for flight.
B. The pilot is repsonsible for operating within the limitations
specified in Section
2.
C. The pilot should familiarize himself with the entire manual prior to
receiving competent flight instruction.
~ Issued: 12/31/80
>
~ Revised: 1/30/84
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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-~ THE ENSTROM HEUCOPTER CORPORATION
TWltt CO\.INTY AIRPORT • PO SOX;.,;;_ MIENCIMINEE. I,IIICHiiG.W 49858
IV. WARNINGS, CAUTIONS AND NOTES
280F
PAGf
REPORT NO.
OAH:·
1.2
28-AC-019
11/17/80
The use of WARNINGS, CAUTIONS, and NOTES to emphasize important and
critical instructions is defined as follows:
A. WARNING: An operating practice or procedure which, if not correctly
followed, could
result in personal injury or loss of life.
B. CAUTION: An operating practice or procedure which, if not correctly
followed, could result in damage to, or destruction of,
equipment.
C. NOTE: An operating practice or procedure which is essentia1 and
requires additional information.
V. SPECIFICATIONS
A. Principal dimensions of 280F helicopters:
Width overa 11
Rotor diameter
Height overa
11
Length overall
Cabin width at seat
Baggage box dimensions
Tread -landing gear
B. Power Plant
Type
Designation
Cylinders
Horsepower
RPM
SFC (full rich)
Weight
Oil
C. Ratios
Lower drive pulley to
upper pu 11 ey
Upper pulley to main
rotor shaft
Engine to main rotor
Tail rotor input shaft to
output shaft
28ft
32 ft
9ft
29 ft 3 in.
58 in.
16 in. x 18 in. x 31 in.
7 ft 4 in.
Lycoming Opposed
HI 0-360-FlAD
4
225 hp (sea level to 12,000 ft)
3050
• 69 1b/hp/hr
357 lbs
10 qts (8 qts minimum for flight)
1.213:1 (3050 - 2514 rpm)
7.154:1 (2514- 351 rpm)
8.678:1 {3050 - 351 rpm)
1:1
~ Issued: 12/31/80
~ Revised: 1/30/84
~~---------------------------------------------------------------- ..
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
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THE ENSTROM HELICOPTER CoRPORATION
280F
TWIN COUNTY AIRPORT • PO_ SOX 2n. MENOMINIEE. MICHIGAN-49656
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-REPORT
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28-AC-019
11/17/80
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This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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,-A THF. ENSTROM HELiCOPTER CoRPORATIOK
~ TWIN COUNl'r' AIRPORT • P 0 80X '2ll. MENO~INE.E. Ml{;HIGP.N '19856
280F · PAGE
REPORT NO
DATE:
1.4
28-AC-019
11/17/80
D. Rotor Systems
Number of blades, main rotor
Chord, main rotor blade
Disk area, main rotor
Number of blades, tail rotor
Chord, tail rotor blade
Disk
area, tail rotor
3
9.5 in.
804 sq ft
2
4.4 in.
17.1 sq ft
E. Weight (see Figure 6.1)
Designed gross weight
Empty weight
2600 lbs
1550 lbs
1050 lbs Usefu 1 load
C.G. travel 96.3
in. to 98.0 in. at 2600 lbs
92.0 in. to 98.8 in. at 2350 1bs
92.0 in. to 100.0 in. at 2000 lbs
NOTE: Four gross weight-e.g. envelopes apply to this helicopter,
see Figure 6.1. Each envelope is associated with a
different maximum cei1ing and a different \INE 1 imitation,
see figure 5.1.
VI. PERFORMANCE (All altitudes are density altitude and performance based on a
2350 lb gross weight unless otherwise noted.)
A. Maximum speed
B.
c.
0.
Issued;
Revised:
VNE power on
\INE power off
117 mph lAS from Sl to 3000 ft Hd.
See Figure 5.1
85 mph lAS from Sl to 8200 ft Hd.
See Figure 5.1
NOTE: Four different maximum ceiHng/\INE envelopes apply to this
helicopter, see Figure 5.1. Each envelope corresponds to a
gross weight/e.g. envelope, see Figure 5.1.
NOTE: This helicopter must meet the requirements of Enstrom
Specification Drawing #28-10015. See Helicopter logbook for
verification that this helicopter meets these requirements.
Cruise speed
75% power 101 mpn lAS at sea level
Maximum cruise speed 117 mph TAS at sea level
122 mph TAS at 3000 ft Hd
Maximum range speed 85 mph IAS at sea level
12/31/80
12/14/88
I
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
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-.- THE ENSTROM HELICOPTER CoRPORATION
TWIN COUNt'f' A~PORT • ? 0 BO:<: 'l77 M E"t.!OIIINEE. M ICHIGP.N 491!69
280F
PAGE }.5
REPORT NO 28-AC-019
DATE 11/17/80
E. Fue 1 consumption at 14. 7 ga 1/hr
75% power
F. Maximum endurance, no reserve 3.5 hrs
57 mph lAS at sea level
G. Fuel capacity 42 gal (40 gal usable)
H. Maxi mum R/C at sea 1 eve 1 1450 ft/mi n
I. Hover ceiling IGE 13,600 ft (see Item K)
J. Hover ceiling OGE 8700 ft
K. Maximum approved operating 12,000 ft, see Figure 5.1
altitude
Issued: 12/31/80
Revised:
7/l/84
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Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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·~ THE ENSTROM HELICOPTER CoRPORATION
~ TWIN COUNT'I' ArRF'OFIT • PO 80X 2n. MENOMINEE. MICHIGAN 4Q!!5.8
SECTION 2
OPERATING LIMITATIONS
PAGE 2.0
280F
REPORT NO 28-AC-019
om ll/17/80
~ FAA Approved: 12/31/80
~l. .. ~R:ev:l~·s~e:d~:~l~/~3:0/~8:4~ .......................................... ~--------..-
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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-.~ TH• ENSTROM HEUCOJ>TER CORPORATION
TWir..; COL-'NT'r AlR.F'ORT • PO SOX 2'l1. ME:t..O~INEE. t.tiCHIGAN ..c.9658
280F
PAGE
P.EPOAT NO
OA1E
2.1
28-AC-019
11/17/80
SECTION 2 - OPERATING LIMITATIONS
I. TYPE OF OPERATION
A. This helicopter is approved for operation under day and ni gilt VFR -
non-icing conditions.
NOTE: Ni gilt operation authorized under vi sua 1 flight rules only.
Orientation
must be rna intai ned by ground 1ight or adequate
celestial illumination.
8. Operation with doors
removed is approved.
II. WEIGHT
A. The maximum gross weight of tl!is helicopter is 2600 pounds. See
Figure 6.1.
III. CENTER OF GRAVITY (All airspeeds are IAS unless otherwise noted.)
A. The longitudinal datum is 100.0 inches forward of the center line of
the main rotor head.
B. There are four gross weight/e.g. envelopes for this helicopter. See
Figure 6.1. Each envelope corresponds to one of four VNE/a ltitude
envelopes as described in paragraph IV. Also, see Figure 5.1.
NOTE: This helicopter must meet the requirements of Enstrom
Spec i fi cation Drawing #28-100015. See He 1icopter Logbook
for verification that this helicopter meets · these
requirements.
If the helicopter does not meet these
requirements,
it must be operated within the limits of
Envelope A.
C. Envelope A is the 1ightest weight envelope with a VNE of 117 mph at
sea level. The e.g. and gross weight limits vary as follows:
l. Upper.weight limit is 2350 lbs.
2. Forward limit at 92.0 inches.
3. Aft 1imit varies 1i nearly
from 94. 6 inches at 2350 lbs to
100.0 inches at 2000 lbs. Aft 1imit at 100.0 inches below
2000 lbs.
~ FAA Approved: 12/31/80
~ Revised: 7/1/84
X:
~------------------------------------------~
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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'~ THE ENSTROM HELICOPTER CORPORATION
TWIN COUHT't AIRPORT ... PO BO:f ?ll_ MENOMIN':E.E.. MICHIGAN [email protected]@.
280F
PAGE 2 .. 2
REPORT NO. 28-AC-019
DATE ll/17 /80
D. Envelope B is the next heavier envelope. It has a VNE of 104 mph.
The e.g. and gross weight limits vary as follows:
I. Upper weight 1 imit is 2450 lbs.
2. Forward limit varies linearly from 93.8 inches at 2450 lbs to
92.0 inches at 2350 lbs.
3. Aft limit varies linearly from 96.0 inches at 2450 lbs to
99.2 inches at 2240 pounds and 100.0 inches at 2000 lbs.
4. Tile lower 1imit corresponds to the upper forward and aft
limits of Envelope A.
E. Envelope C has· a VNE at sea level of 91 mph. The e.g. and gross
weight
limits vary as follows:
I. Upper weight 1i mit is 2550 1bs.
2. Forward limit varies lil'lfarly from 95.5 inches at 2550 lbs to
93.8 inches at 2450 lbs.
3. Aft limit varies linearly from 97.3 inches at 2550 lbs to
98.4 inches at 2470 lbs and then to 99.2 inches at 2240 lbs.
4. Lower limit corresponds to the upper forward and aft limits of
Envelope B.
F. Envelope D is the heaviest envelope. It has a VNE at sea level of
85 mph. The e.g. and gross weight limits vary as follows:
1. Upper weight limit is 2600 lbs.
2. Forward 1 imit varies from 96.3 inches at 2600 lbs to 95.5 inches
at 2550 lbs.
3. Aft limit varies linearly from 98.0 inches at 2600 lbs to
98.4 inches at 2470 lbs.
4. lower limit corresponds to the uptJer forward and aft limits of
Envelope C.
G. The lateral datum line is the centerline of the helicopter. lateral
moment arms are positive right and negative left.
H. Lateral offset moment limits vary with weight. See Figure 6.2.
1. From 2025 lbs to 2600 lbs, limits are -3250 in-lbs and
+3700 in-lbs.
2. Below 2025 lbs, see Figure 6.2.
FAA Approved: 12/31/80
Revised: 7/l/84
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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~- Til" ENSTROM HELICO PTilR CoRPORATION
TWIN COUI>ff'l oiJAPOF'iT • PO E!OX 277_ MEt.DI/III\IE.E, MICHIGAN 496Y.I
280F
PAGE
REPORT NO.
OATE:
2.3
28-AC-019
11/17/80
IV. AIRSPEED
Never exceed speed (VNE) - 117 mph, lAS, sea level to 3000 ft density
altitude. See Figure 5.1 for variations above 3000 ft and for
variations with gross weight/CG.
NOTE: There are four VNE/a ltitude envelopes which apply to this
helicopter. Each envelope corresponds to one of four gross
weight/CG envelopes. See Figure 5. 1.
NOTE:
This helicopter must meet the requirements of Enstrom Speci-
fication Drawing #28-100015. See Helicopter Logbook for
verification that this helicopter meets these requirements.
If the helicopter does not meet these requirements, it must
be operated within the limits of Envelope A.
V. ALTITUDE
Maximum approved operating a1t itude -12,000 ft density a1 titude at
2350 1bs. For variations of altitude with gross weight, see
Figure
5.1.
NOTE: Takeoffs and landings at 2600 lbs gross weight were demon-
strated to 7000 ft density altitude in all wind conditions up
to 20 mph. DO NOT EXCEED ENGINE LIMITATIONS.
Takeoffs and landings at 2350 lbs gross weight were demon-
strated to 10,000 ft density altitude in all wind conditions
up to 15 mph.
Operators should use appropriate caution above 10,000 ft
density altitude and in winds greater than 15 mph to insure
safe
takeoffs and landings.
VI. ROTOR RPM
A. Flight limitations power on:
Minimum:
Maximum:
334 rpm
351 rpm
B. Flight limitations power off:
Minimum: 334 rpm
Maximum: 385 rpm
NOTE: During transient maneuvers, such as simulated power failure
during pilot training, the rotor RPM may fall below 334. These
maneuvers have been demonstrated with rotor RPM dropping briefly
to 280, however, sufficient time and altitude must be available
to regain RPM.
See Section 8 for Adjustment Procedures.
FAA Approved:
Revised: 12/31/80
12/14/88
~------------------------------------------~
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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0
,_ THE ENSTRO>! HELICOPTER CoRPORATION
TIM"' COU-•HV AIR-PORT • PO BOX ~71 MENOMINE~. MI:::HIGAN 49!58
280F
PAGE 2~4
REPORT NO. 28-AC-0 19
DATE 11/17/88
VII. POWER PLANT LIMITATIONS - LYCOMING HI0-360-FlAD
Engine modified per Enstrom Turbocharger Kit LW-14460.
A. Maximum continuous power:
level to 12,000 ft.
225 hp, 3050 rpm, 39.0 in. MP, sea
B. Engine operating rpm:
Minimum: 2900 rpm
Maximum: 3050 rpm
C. Engine id1e rpm - clutch disengaged
Minimum: 1450 rpm
Maximum: 1500 rpm
D. Manifold pressure: 39.0 in. Hg, sea level to 12,000 ft
E. Cylinder head temperature: 500°F maximum
F. EGT: 1650°f maximum
G. Fuel: 100/130 aviation grade gasoline (green)
lOOLl aviation grade gasoline (olue)
H. fuel mixture
setting:
1.
29 in. MP or be 1 ow
a. Maximum fuel flow - full rich
b.
Minimum fuel flow- leaned to 1650°f ricn
2. 29
in. MP to 39.0 in. MP (full
rich}
I. Oil temperature: 245° maximum
J. Oil pressure:
100 psi
60-90 psi
28 psi
maximum starting and warm up
normal operating
minimum id1ing
VIII. TRANSMISSION LIMITATIONS
Transmission oil temperature: 225°F maximum
side of peak
~ FAA Approved: 12/31/80
~ Revised: 12/14/88
~------------------------------------------~
This electronic document is not linked to a subscription for revision control or distribution. Refer to theTechnical
Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of the 280F Rotorcraft Flight Manual.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED