Eaton Crouse-Hinds L-850 A User manual

DOCUMENT 9913
REVISION V
May 8, 2019
EATON Crouse-Hinds Series
Airport Lighting Products Rev. $
1200 Kennedy Road
Windsor, CT 06095
InstructionManual
Style3
RunwayCenterlineLight(RCL)L-850A
&
TouchdownZoneLight(TDZ)L-850B
For parts and technical service call [phone]
Copyright © 2019 Cooper Technologies Company

Document 9913
Rev. V
Instruction Manual
Style 3
RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
ii
1 Revisions
Revision
Number
Issue/Reissue
Letter Number
Description
Checked
Approved
A
A99-183
INITIAL ISSUE
KWF
JMM
B
A200-022
REVISED PGS.
9,10
KWF
JMM
C
A200-068
REVISED PGS. 4, 8 ( ADDED P/N 21124), PART LIST
ITEM 25 WAS 10030-135
KWF
JMM
D
A200-153
REVISED PAGES 1, 8 (ADDED CX VERSION AND
PARTS LIST ITEMS 30,31)
KWF
JMM
E
A201-281
PAGE 2 (PARA 6.1) & PAGE 8 ITEM 11, 48 WATT
LAMP WAS 45 WATT
PJG
JMM
F
A202-210
Revise paragraph 7. Revised paragraphs 8.2, 8.4, 8.5 to
include the use of Loctite 242. Added Loctite 242 as parts
list item 23. Change item 8 to 1.5" long.
KWF
JMM
G
A203-082
Added Figure 1 and renumbered following Figures
4/3/03
GFR
H
A203-142
Added O-ring, Item 32 in Parts List; Added para. 8.3 and
renumbered following paras; Updated Fig. 7
6/4/03
GFR
J
A204-244
Parts List, Item 21 was #10-32 x ½ LG
10/15/04
GFR
K
A205-082
Added Option G, Para. 9.9, Figure 8, and Item 33 to
Table 10
4/28/05
GFR
L
A205-370
Revised mounting bolt length from 3/8 x 7/8 to 3/8 x 1½
in paragraphs 7.1 and 8.0. Added “Install new stainless
steel split-ring lock washers”, to paragraphs 9.2, 9.4, 9.5,
9.6, 9.7, 9.9 Added Loctite 242 recommendation to
paragraph 9.11.4
11/28/05
KWF
M
A207-060
Title page, added copyright and removed from all other
pages; Figure 7, pointed item 1 & 2 to correct parts
2/23/07
PG

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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N
A209-101
Parts List, Item 10 was 21115 & 304 Stn Stl was 18-8;
FAA AC 150/5345-46D was 46C (all locations)
7/15/09
JRC
P
A210-072
Parts List, Item 9 was 21112, item 22 was 10038-43 &
added (**) 21508 assembly note; Copyright revised to
2010
8/12/10
MCB
R
A211-033
Pg 4, 93, ”Paragraph 9.4” was 8.4; Pg 10 Parts List , item
29 & 32 (see section 9.3) was 8.3; cover page, copy right
was 2010
4/5/11
SD
S
A212-403
Title page, copyright was 2011 & deleted PATENT
PENDING; 7.1 & 7.2, -46 (latest revision) was -46D, 7.1
& 8, 2 piece was lock & sec 8, 243 was 242; all locations,
Loctite 243 was 242 (P/N 10048-30) & 2 piece was split-
ring lock; page 10, item P/N was 11A12-037D & item 26
P/N was 10048-25
11/27/12
PG
T
A215-157
Item 8 was 10C10-037D40. Revised torque ranges
extensively. Added sections 8.1 and 8.2. Added table 1
10/12/15
FR
U
A217-181
Cover Page : Logo updated ; Pg. No. iv : Section 2
updated extensively ; Pg. No. 1 : Added section 8.1, 8.2 &
8.3 to the table of content ; Section 9.2, 9.4,9.5,9.6 & 9.7
are updated –Torque instructions are referred to section
8.2 ; Pg. No. 12 : Part list –Part no. 19 was 10000-468 ;
Pg. No. 14 : Fig 5 & 6 updated. Page 15 : Fig 7 updated.
09/12/17
MA
V
A219-078
Revised copyright to 2019; Revised section 8.2
extensively;
Section 10, Item 8 was 21715-XX, Item 25 was 10030-149
Updated table “BOLT LENGTHS”for P/N 21716-XX
was P/N 21715-XX.
05/08/19
EB

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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2 Limited ProductWarranty
Warranty: Refer to Eaton’s Crouse-Hinds Airport Lighting Products Terms and
Conditions for product specific warranty information.

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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3 SAFETY NOTICES
NOTICE:
NOTICE
This equipment is normally used or connected to circuits that may employ voltages that
are dangerous and may be fatal if accidentally contacted by operating or maintenance
personnel. Extreme caution should be exercised when working with this equipment.
While practical safety precautions have been incorporated in this equipment, the
following rules must be strictly observed:
3.1 KEEP AWAY FROM LIVE CIRCUITS
DANGER:
DANGER
Operating and maintenance personnel must at all times observe all safety regulations.
Do not perform maintenance on internal components or re-lamp with power ON.
3.2 RESUSCITATION
Maintenance personnel should familiarize themselves with the technique for resuscitation found in
widely published manuals of first aid instructions.
IMPORTANT:
IMPORTANT
See FAA Advisory Circular AC 150/5340-26 for additional information.

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4 SAFETY SYMBOLS
DANGER:
DANGER
The hazard or unsafe practice will result in severe injury or death.
WARNING:
WARNING
The hazard or unsafe practice could result in severe injury or death.
CAUTION:
CAUTION
The hazard or unsafe practice could result in minor injury.
NOTICE:
NOTICE
Possibly dangerous situation, goods might be damaged.
IMPORTANT:
IMPORTANT
Helpful information.

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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5 TABLE OF CONTENTS
Title Page…. ....................................................................................................................... i
1.0 Revisions ..................................................................................................................... ii
2.0 Limited Product Warranty............................................................................................. Iii
3.0 Safety Notices .............................................................................................................. iv
4.0 Safety Symbols …………………………………………….. ............................................ v
5.0 Table of Contents ........................................................................................................ vi
6.0 Part Number Explanation ............................................................................................. 1
7.0 General Description...................................................................................................... 3
7.1 Runway Centerline Light, L-850A......................................................................... 3
7.2 Touchdown Zone Light L-850B............................................................................ 3
8.0 Installation..................................................................................................................... 4
8.1 Installation............................................................................................................. 4
8.2 Installation Bolt Torque......................................................................................... 4
8.3 Heico-Lock Installation Guidelines (2014)............................................................ 5
9.0 Maintenance................................................................................................................. 5
9.1 Cleaning Lenses................................................................................................... 5
9.2 Relamping ............................................................................................................ 6
9.3 Seal Revisions...................................................................................................... 6
9.4 Gasket Replacement ........................................................................................... 7
9.5 O-Ring Replacement............................................................................................ 7
9.6 Lens Replacement ............................................................................................... 8
9.7 Feed-thru Replacement ....................................................................................... 8
9.8 Pressure Test....................................................................................................... 8
9.9 External Support Ring Gasket Replacement …… ............................................... 9
9.10 Cleanliness and Workmanship............................................................................. 9
9.11 Maintenance Program.......................................................................................... 9
10.0 Parts List ……………………………………………………………………………….. 12
Figure 1 - Lamp Orientation ........................................................................................... 2
Figure 2 - 19999 Installation ( Lifting )Tool .................................................................... 11
Figure 3 - Top View of Fixture........................................................................................ 14
Figure 4 - Side View of Fixture........................................................................................ 14
Figure 5 - Feed-thru adapter detail................................................................................. 15
Figure 6 - Bottom View of Fixture ................................................................................... 15
Figure 7 - Cut-away View of Fixture................................................................................. 16
Figure 8 - Side View of Fixture with Optional External Support Ring Gasket ….. ........... 17

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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6 PART NUMBER EXPLANATION
FAA TYPE:
A = RUNWAY CENTERLINE
LIGHT
B = TOUCHDOWN ZONE
LIGHT
FAA STYLE:
COLOR FILTERS:
CC = CLEAR/CLEAR (L-850A)
CR = CLEAR/RED (L-850A)
RX = RED/BLANK (L-850A)
C = CLEAR (L-850B)
CX = CLEAR/BLANK (L-850B)
FIXTURE DIAMETER:
12F = OPTICAL ASSEMBLY WITH
12" FAA SUPPORT RING
NSR = OPTICAL ASSEMBLY WITHOUT
SUPPORT RING
L-823 CONNECTION:
P1 = ONE PLUG (BLANK COLOR UNITS WILL HAVE A
THREADED CAP INSTALLED ON SIDE "B"
FEED-THRU ADAPTER)
P2 = TWO PLUGS (L-850A ONLY)
BEAM ORIENTATION (L-850B ONLY):
L = LEFT TOE-IN
R = RIGHT TOE-IN
S = STRAIGHT
OPTIONS:
G = EXTERNAL GASKET BETWEEN OPTICAL ASSEMBLY AND
SUPPORT RING. NOTE: OPTICAL ASSEMBLIES WITH THE
EXTERNAL GASKET WILL ONLY FIT SUPPORT RINGS
MARKED "G" TOP SURFACE.
850 3 - - - - -

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RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
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7 General Description
7.1 Runway Centerline Light, L-850A
The Crouse-Hinds Style 3 Runway Centerline Light is an ITS verified FAA L-850A per FAA AC 150/5345-46
(latest revision). It is designed for installation at the centerline of runways or any other location where visual
guidance of moving aircraft or ground vehicles is desirable. The fixture is designed to fit on a FAA L-868, steel,
Size B light base per FAA AC 150/5345-42(latest version), and have a total height above grade/ground level of
.250 inch. The fixture is bi-directional, projecting two beams of light 180°apart. It is weatherproof and will
endure roll over loads without damage. The light fixture consists of a ductile iron support ring and a removable
aluminum optical assembly. The ductile iron ring is mounted to a light base with six bolts (3/8-16 UNC x1½ lg.,
stn. stl.) and 2 piece washers (3/8, stn. Stl.). The aluminum optical housing is secured to the ductile iron ring
using two high-strength bolts and two high-strength shear pins. The optical housing has a die cast inner cover
that is attached using 4 screws. A polyurethane o-ring is used to provide a watertight seal between the inner
cover and the optical housing (see section 9.3). An optional silicone gasket is bonded to the outside of the inner
cover to provide a watertight seal between the optical assembly and the ductile iron support ring. Two 48-watt,
MR-16 lamps are secured to two brackets, which are fastened to the bottom housing. Electrical connections are
made at either one or two feed-thru assemblies in the inner cover. The feed-thrus have ITS verified L-823 plugs
for connecting to FAA L-830/ L-831 Isolation Transformers. Lenses are held into the aluminum housing with a
bracket, gasket, molded elastomeric boot and two screws. Red dichroic-coated lenses are available from the
factory, or may be installed in the field. All hardware is type 18-8 stainless steel. The complete light unit is
11.94 inches in diameter, 3.63 inches deep, and weighs 20 lbs.
7.2 Touchdown Zone Light, L-850B
The Crouse-Hinds Touchdown Zone Light is an ITS verified FAA L-850B per FAA AC 150/5345-46 (latest
revision). Except for being unidirectional, its design is identical to the L-850A described in section 7.1. Toe-in
of the light beam is obtained internally by alignment of the lamp bracket holes and the corresponding holes in
the bottom housing. The toe-in direction orientation can be straight, toe-left or toe-right
Toe-Left Straight Toe-Right
Figure 1

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CAUTION:
CAUTION
Never handle the light assembly by the leads as this can break the waterproof seal.
8 Installation
8.1 Installation
The Style 3 RCL and TDZ light units are shipped complete, including the lamp(s), and are ready for installation
as received. Installation of the light unit is to be done with primary POWER OFF and SECURED. At
each light location, install a steel, Size B, 12 inch deep minimum, L-868 Light Base per FAA AC 150/5340-4
(latest revision). Install the light base with two opposite bolt holes perpendicular to the runway centerline. Place
the properly sized isolation transformer(s) in the light base and make necessary primary power connections
using L-823 connectors. The RCL light unit requires either two 45 watt, 6.6A secondary transformers for the
two lead version, or one 100 watt, 6.6A secondary transformer for the single lead version. The TDZ light unit
requires one 45 watt, 6.6A secondary transformer. Verify that the mounting flange on the light base is clean and
the o-ring (optional on deep cans) is coated with Dow Corning FS 1292 grease and is in place on the light base.
Connect the plug(s) from the light unit to the secondary(ies) of the previously installed isolation transformer(s).
Installation tool, Crouse-Hinds P/N 19999, will ease in the installation and removal of the light unit (See Figure
2). The threaded eyebolts on the lifting tool screw into threaded holes in the light fixture. Lower the light unit
straight down onto the base. The light fixture is subject to optical misalignment or mechanical damage if not
seated properly. Verify the light beam(s)/color(s) are properly orientated for the individual location. Secure the
light fixture to the base per section 8.2
8.2 Installation Bolt Torque
•Use fully threaded, 3/8-16 bolts meeting requirements of FAA EB83A. (P/N 21716 is
recommended.)
•Use Heico-Lock or Nord-Lock stainless steel lock-washers per FAA specifications*.
•Mounting base holes must be degreased, cleaned, and dried prior to bolt installation.
•Base-to-fixture mating surfaces must be degreased, cleaned, and dried prior to installation.
•Apply marine grade anti-seize (K=.18) per manufacturer’s instructions to each bolt.
•Install the 3/8-16 bolts with lock-washers per lock-washer manufacturer’s guidelines.
•See Section 8.3 for Heico-Lock installation guidelines (2014)
•Achieve a full final torque of 28 FT-LBS (37.9 N-m) ±10% with a calibrated torque wrench.
•Impact wrenches are not recommended as installation tools.
•Check torque and re-torque all bolts within 2 weeks of initial installation.
•Maintain all bolts by checking and re-torqueing per FAA specifications*.
•If any lubricants or thread locking compounds are used (not recommended), torque must be
recalculated based on K factor provided by lubricant or compound manufacturer.
•New bolts and lock-washers shall be used each time a light unit is removed from its base.
*Refer to the following specifications for FAA installation and maintenance recommendations:
•AC150/5340-26 “Maintenance of Airport Visual Aids”
•AC150/5345-46 “Specification for Runway and Taxiway Light Fixtures”
•FAA Engineering Brief No. 83A “In-pavement Light Fixture Bolts”

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WARNING:
WARNING
8” Pro APF TCL optical assemblies are designed to withstand a maximum torque of 28 ft-lb (336
in-lb) per bolt, assuming K=.18 lubricant and appropriate superior-grade 3/8” hardware, however
other components within the light fixture installation (i.e. base-can, extension rings, spacer rings,
etc.) may not be capable of supporting such a load. Crouse-Hinds recommends following the
installation bolt torque values and methodology outlined in Section 8.2.
8.3 Heico-Lock Installation Guidelines (2014)
Step 1: Hand tighten to ensure that 2-3 threads extend beyond the nut on through-bolt applications.
Step 2: Tighten each bolt to one-third of the final required torque following the pattern as shown below.
Step 3: Increase the torque to two-thirds following the pattern shown below.
Step 4: Increase the torque to full torque following the pattern shown below.
Step 5: Perform one final pass on each bolt working clockwise from bolt 1, at the full final torque.
9 Maintenance
The preferred method of maintaining these lights is to periodically and systematically replace the Optical
Assembly and return it to the maintenance shop for renovation. As an alternative, the Optical Assembly can be
serviced in the field. However, it is recommended that field servicing be limited to cleaning the lens as
described in section 9.1 and to lamp replacements as described in section 9.2.
9.1 Cleaning Lenses
With a compressed air blast or suitable brushes, remove all accumulated debris from the light channel. Clean
the outer surface of the prism with a detergent solution. If the lens is coated with a substance impervious to the
detergent, a suitable solvent should be sparingly applied with a wad of cotton or a patch of cloth on the end of a
wood splint. After the solvent has acted the remaining solvent and softened coating should be removed with a
clean piece of cotton or cloth. Care should be taken to avoid excessive contact between the solvent and the lens
seal. Remove all remaining solvent from lens and seal. A gentle air blast may be used.

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9.2 Relamping
WARNING:
WARNING
Light assembly parts are hot when lamp is energized and remain hot for a short time
after lamp/fixture is turned off.
Remove and secure power to the fixture. Separate the Optical Assembly from the outer ring by removing
the two bolts. There are two pry slots in the optical housing to help separate the Optical Assembly from the
support ring. Turn the Optical Assembly upside down and remove the four screws holding the inner cover to the
light housing. Disconnect the lamp leads from the feed-thru terminals. Remove the Lamp Assembly by gently
pulling up on the lamp reflector base. Inspect the feed-thru terminal for signs of corrosion. Replace feed-thru
assemblies per paragraph 9.7. Clean the inside surfaces of the lens(es) with denatured alcohol. Inspect the lamp
holder bracket(s) for loose hardware; tighten the mounting screws to 30 in-lbs.
CAUTION:
CAUTION
Touching the quartz bulb with bare fingers may seriously shorten lamp life. If the
bulb has been touched, wipe it clean with a piece of lens cleaning tissue or similar
material moistened with denatured alcohol.
Install the new lamp by reversing the procedure above. Make certain the rim of the reflector is flush against the
bracket and seated against the two pins at the bottom of the bracket. Connect the lamp leads to the feed-thru
terminals. Inspect/ replace the inner cover o-ring per paragraph 9.5 (see section 9.3). Assemble the inner cover
onto the light housing. The screw hole patterns in the inner cover and light housing are offset to insure proper
alignment. Tighten the mounting screws to 30 in-lbs. Clean the mounting flange area of the support ring. Place
the Optical Assembly into the support ring. Secure per section 8.2.
9.3 Seal Revision
Fixtures manufactured prior to May 2003 use a high temperature silicone gasket (P/N 21124), bonded to the
inner cover (P/N 21118-X), to provide a watertight seal between the inner cover and the optical housing (P/N
21105-X). Paragraph 9.4, Gasket Replacement, details the instructions on how to replace the 21124 gasket.
Starting in May 2003, a polyurethane o-ring (P/N 10035-62) was used to provide the watertight seal between
the optical housing and inner cover. The o-ring is not bonded to either the optical housing or inner cover. This
revision requires an o-ring groove to be machined into the 21105-X optical housing, and all replacement optical
housings will be supplied with the o-ring groove. Paragraph 9.5, O-Ring Replacement, details the instructions
on how to replace the 10035-62 o-ring. To retrofit an older style inner cover to the o-ring groove style optical
housing, cut the 21124 gasket flush with the mounting surface on the inner cover with a razor blade.

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9.4 Gasket Replacement
Everytime the Optical Assembly is opened the gasket must be closely examined and replaced if necessary. Any
gasket that is stretched, torn, has a permanent set or some other defect, which would prevent it from forming a
watertight seal must be replaced with a new gasket. Remove the old gasket from the groove in the inner cover.
Carefully clean the flange mating surfaces and the inner cover groove. This can be done by carefully scraping.
Take care not to damage the mating surface and the bottom and sides of the groove. Coat the gasket (P/N
21124) with a thin layer of Dow Corning FS 1292 Lubricating grease. Position the new gasket in the center of
the groove and press it into place. The grease will hold the gasket in place while the inner cover is positioned on
the light housing. Torque the inner cover screws to 30 in-lbs. Perform a pressure test as described in paragraph
9.8. Clean the mounting flange area of the support ring. Place the Optical Assembly into the support ring.
Secure per section 8.2
9.5 O-Ring Replacement
Every time the Optical Assembly is opened the o-ring must be closely examined and replaced if necessary. Any
o-ring that is stretched, torn, has a permanent set or some other defect, which would prevent it from forming a
watertight seal must be replaced with a new o-ring. Remove the old o-ring from the groove in the optical
housing. Carefully clean the o-ring groove and flange mating surface on the inner cover. Take care not to
damage the mating surface or o-ring groove. Coat the o-ring (P/N 10035-62) with a thin layer of Dow Corning
FS 1292 Lubricating grease. Position the new o-ring in the groove and press it into place. Torque the inner
cover screws to 30 in-lbs. Perform a pressure test as described in paragraph 9.8. Clean the mounting flange
area of the support ring. Place the Optical Assembly into the support ring. Secure per section 8.2
IMPORTANT
IMPORTANT
NOTE –A bad gasket seal is the most common cause of inset fixture leaks. It is
strongly recommended that a new gasket be installed every time the Optical Assembly
is opened.
NOTE –The groove is designed to be wider than the gasket. This provides room for
displacement of the gasket when compressed between the housing and mating surface.
Properly tightened screws are important in obtaining a complete seal.

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9.6 Lens Replacement
If a lens is broken, leaks or is badly pitted or scarred, it must be replaced. It is highly recommended that this
task be performed in a clean shop environment. Use Lens Replacement Kit P/N 21126-C for clear lenses, and
kit P/N 21126-R for red lenses. Remove and secure power to the fixture. Separate the Optical Assembly
from the outer ring by removing the two bolts. There are two pry slots in the optical housing to help separate the
Optical Assembly from the support ring. Turn the Optical Assembly upside down and remove the four screws
holding the inner cover to the light housing. Remove the two lens retaining bracket screws from the light housing.
Remove the lens-retaining bracket and discard the lens-retaining gasket. Firmlypush the lens/boot assembly from the
outside of the light housing; discard the old lens and boot. Thoroughly clean the lensopening with denatured alcohol
and allow to dry. Inspectthe lensopening for scratches or pits, a damaged lens opening surface will not seal properly.
Place a new lens boot (P/N 21103) over the replacement lens (P/N 21102-C or 21102-R). Apply a thin coat of
Dow Corning FS 1292 grease over the entire outside surface of the lens boot. Align the lens/boot assembly in
the lens opening and press it into place. Verify that the lens boot is not pinched in the lens opening. Using a new
lens retaining gasket (P/N 21101), fasten the lens retaining bracket (P/N 21100) to the light housing. Torque the
mounting screws to 55-60 in-lbs. Assembly the inner cover onto the light housing. The screw hole patterns in
the inner cover and light housing are offset to insure proper alignment. Torque the mounting screws to 30 in-lbs.
Perform a pressure test per paragraph 9.8. Clean the mounting flange area of the support ring. Place the Optical
Assembly into the support ring. Secure per section 8.2
9.7 Feed-thru Replacement
Remove and secure power to the fixture. Separate the Optical Assembly from the outer ring by
removing the two bolts. There are two pry slots in the optical housing to help separate the Optical Assembly
from the support ring. Turn the Optical Assembly upside down and remove the four screws holding the inner
cover to the light housing. Disconnect the lamp leads from the feed-thru terminals. Remove the feed-thru by
unscrewing the retaining collar. Clean the mounting surface with Isopropyl Alcohol and allow to dry. Apply a
thin coat of Dow Corning FS 1292 grease to the mounting flange of a new feed-thru (P/N 21121 for 2 lamp/ 1
plug, or P/N 21122 for 1 lamp/ 1 plug). Apply a drop of Loctite 242 to the feed-thru adapter threads. Screw the
feed-thru retaining collar onto the adapter; refer to Figure 6 for proper inner cover/ feed-thru orientation. Torque
the retaining collar to 30 in-lbs. Assembly the inner cover onto the light housing. The screw hole patterns in the
inner cover and light housing are offset to insure proper alignment. Torque the mounting screws to 30 in-lbs. .
Perform a pressure test per paragraph 9.8. Clean the mounting flange area of the support ring. Place the Optical
Assembly into the support ring. Secure per section 8.2
9.8 Pressure Test
A light fixture should be subjected to a 20-psi air pressure test to verify that it is waterproof whenever it has
been opened or components have been replaced. A tire valve style pressure fitting is located on the bottom of
the inner cover. Pressurize the fixture to 20-psi then place it in a tub of water or use a soap solution to locate
escaping air bubbles. Carefully inspect the areas around the lens, inner cover seal, and feed-thru adapter for
leaks. Relieve the internal air pressure before installing the fixture or attempting to repair a leak.

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9.9 External Support Ring Gasket Replacement
Everytime a light fixture with the optional external support ring gasket is removed from the support ring, the
gasket on the inner cover should be examined and replaced if necessary. Any gasket that is stretched, torn, has
a permanent set or some other defect, will allow water to enter the light base. Remove the old gasket from the
inner cover by carefully scraping. Take care not to damage the inner cover. Form a thin bead of high
temperature silicone adhesive, such as GE RTV 106, on the inner cover sealing surface. Position the new
gasket (P/N 21180) on the inner cover in the same location as the old gasket. Allow the silicone to cure for 4 to
12 hours. Cure times depend on the amount of silicone use, ambient temperature, and relative humidity. Apply
a thin coat of Dow Corning FS 1292 grease over the entire outside surface of the gasket before placing in the
support ring. Secure per section 8.2
WARNING:
WARNING
Do not exceed 20 psi when pressure testing the fixture. Serious injury and/or
permanent damage to the fixture may result if a higher air pressure is used. Once
the pressure test is complete be sure to relieve the air pressure.
9.10 Cleanliness and Workmanship
Service life depends upon the entire assembly being waterproof. All surfaces must be clean, dry and free of all
foreign matter if the light fixture is to operate for extended periods without requiring maintenance.
9.11 Maintenance Program
In order to insure maximum light fixture life, the installed units should be subject to a maintenance program in
accordance with the following:
A daily operation check should be made of the lighting fixture. The lights should be energized and visually
inspected. If any lamps are out, the location of the fixture should be recorded and the lamps replaced at a time
when the circuit is de-energized. (See Section 9.2 )

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9.11.1 Regular cleaning is necessary in order to insure that inset lighting fixtures operate at maximum efficiency. The
lensand channel in front of the lens should be cleaned periodically with a soft cloth and solvent. The weather
and the location of the fixtures will dictate the regularity and type of cleaning.
9.11.2 Snowplow operators should exercise extra care not to strike the light fixtures with snowplowblades. After
snowplow removaloperations, inspect all light fixtures to locate and replace if necessary, any damaged Light
Assemblies. Passes over the light rows should be made witha power broom only if practical. Whenever
snowplows must traverse in-pavement light fixtures, they should be traveling at less than 5 mph or have the
blades lifted clear of the fixtures.
9.11.3 The light is designed to exclude both ground and surface water from entering. If the lights are not properly
maintained (i.e., bolts tightened and seals in good condition) water mayenter the fixture. To prevent this from
occurring, itis recommended that each fixture be inspected for the presence of water at least once a month. More
frequent inspection is desirable duringand following rainy seasons.
9.11.4 Optical Assembly and support ring hold-down bolts should be checked for proper torque per section 8.2.
9.11.5 If any fixture contains water, the water should be removed and the entire fixture cleaned and dried. Perform a
pressure test per paragraph 9.8 to locate the source of the leak. Replace the bottomcover gasket or o-ring; see
Section 9.3, 9.4 and 9.5.

Document 9913
Rev. V
Instruction Manual
Style 3
RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
11
Figure 2 19999 Installation (Lifting) tool

Document 9913
Rev. V
Instruction Manual
Style 3
RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
12
10 Parts List
ITEM
PART
NUMBER
850A3-
CC-12F-
P1
QTY
850A3-
CR-12F-
P1
QTY
850A3-
CC-12F-
P2
QTY
850A3-
CR-12F-
P2
QTY
850B3-C-
12F-P1-
L, -R, -S
QTY
850B3-CX
-12F- P1-
L, -R, -S
QTY
DESCRIPTION
1
21100
2
2
2
2
1
2
BRACKET, LENS RETAINING, 18-8 STN STL.
2
21101 *
2
2
2
2
1
1
GASKET, LENS RETAINING
3
21102-C *
2
1
2
1
1
2
LENS, CLEAR
4
21102-R *
0
1
0
1
0
0
LENS, COLOR COATED RED
5
21103 *
2
2
2
2
1
2
BOOT, LENS
6
21105-1
0
0
0
0
1
0
OPTICAL HOUSING, MACHINED, TDZ, ALUM.
7
21105-2
1
1
1
1
0
1
OPTICAL HOUSING, MACHINED, RCL, ALUM.
8
21716-XX
2
2
2
2
2
2
BOLT, 3/8-16, 410 STN STL. CUSTOMER. SPEC’D LENGTH
9
**
1
1
1
1
1
1
SUPPORT RING, MACHINED/PLATED, DUCTILE IRON
10
21461
2
2
2
2
1
1
LAMP BRACKET ASSEMBLY, 304 STN STL.
11
21116
2
2
2
2
1
1
LAMP/REFLECTOR ASSEMBLY, 48 W, 6.6 A.
12
21118-1
0
0
0
0
1
0
BOTTOM COVER, MACHINED, TDZ, ALUM.
13
21118-2
1
1
1
1
0
1
BOTTOM COVER, MACHINED, RCL, ALUM.
14
21120
2
2
2
2
1
2
ADAPTER, THREADED, FEED-THRU, ALUM.
15
21121
1
1
0
0
0
0
FEED-THRU ASSEMBLY, 2 LAMP/1 PLUG, ALUM.
16
21122
0
0
2
2
1
1
FEED-THRU ASSEMBLY, 1 LAMP/1 PLUG, ALUM.
17
21123
0
0
1
1
0
0
BAFFLE, RCL
18
10000-471
1
1
1
1
1
1
SCREW, SEMS, PAN HD TYPE 1A CROSS, GREEN, #10-32 X
3/8 LG, 18-8 STN STL.
19
10000-548
4
4
4
4
2
4
SCREW, SOCKET HEAD CAP, #10-32 THD - 7/16'' LONG,
WITH NYLON PATCH.
20
10000-469
6
6
8
8
3
3
SCREW, SEMS, PAN HD TYPE 1A CROSS/DRI-LOC, #8-32 X
3/8 LG, 18-8 STN STL.
21
10000-470
4
4
4
4
4
4
SCREW, 100 FLAT HD/DRI-LOC, #10-32 X 7/16 LG, 18-8 STN
STL.
22
**
2
2
2
2
2
2
DOWEL PIN, 3/8 X 3/4 LG,
23
10048-30
A/R
A/R
A/R
A/R
A/R
A/R
MEDIUM STRENGTH THREADLOCKER, LOCTITE 242
24
10037-795
1
1
1
1
1
1
FITTING, PRESSURE TEST, 1/8-NPT
25
10030-0164
2
2
2
2
2
2
WASHER, 2 PIECE, 3/8, STN STL.
26
10048-140 *
A/R
A/R
A/R
A/R
A/R
A/R
SILICONE GREASE
27
10048-106
A/R
A/R
A/R
A/R
A/R
A/R
PIPE SEALANT PASTE
28
10035-0061
2
2
2
2
1
2
O-RING, FEED-THRU ADAPTER
29
21124
1
1
1
1
1
1
GASKET, BOTTOM COVER (SEE SECTION 9.3)
30
21143
0
0
0
0
0
1
GASKET, BLANK COLOR, LENS RETAINING
31
10037-805
0
0
0
0
0
1
CAP, 7/8-16 UN-2B THREAD
32
10035-62
1
1
1
1
1
1
O-RING, 3/32, (SEE SECTION 9.3)
33
21180
A/R
A/R
A/R
A/R
A/R
A/R
EXTERNAL SUPPORT RING GASKET (OPTIONAL)
* These parts are included in a Lens Replacement Kit. Use kit P/N 21126-C for clear lenses, and kit P/N 21126-R
for red lenses. Each kit contains parts to replace one lens.
** These parts come assembled as P/N 21508.

Document 9913
Rev. V
Instruction Manual
Style 3
RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
13
Item 8, 21716-XX, length options. Length is in inches.
BOLT LENGTHS
P/N
LENGTH
21716-07
.88
21716-08
1.00
21716-09
1.13
21716-10
1.25
21716-11
1.38
21716-12
1.50
21716-14
1.75
21716-16
2.00
21716-18
2.25
21716-20
2.50
21716-22
2.75
21716-24
3.00
21716-26
3.25
21716-28
3.50

Document 9913
Rev. V
Instruction Manual
Style 3
RunwayCenterline Light L-850A & Touchdown Zone Light L-850B
14
Figure 3 Top View of Fixture
Figure 4 Side View of Fixture