© ADB Airfield Solutions All Rights Reserved
21
2.4.2.3 Replacing a Prism on an
L-852 LED Light Assembly
Figure 12:
Typical 12" L-852A, B, & C, and ICAO Straight, BI-DIR., 1 Cordset.
Assembly Shown
Follow the steps in “Replacing the Prism” on page 20 if the prism is broken or its surface is
badly pitted or scarred.
1. Remove the prism-clamp plate secured in the cover.
Discard the plate, and retain the countersunk screws.
2. Install the replacement prism-keeper plate supplied in the kit using the Phillips
countersunk screws retained from step 1. (See Figure 20) This plate holds the LEDs. Do
Not get grease on the LED surfaces or wires.
3. Apply a drop of sealant Loctite 270 or equivalent to the last threads.
4. Torque to 31 ±4 in-lb (3.5 ±0.5 N•m).
5. Connect the wires to the circuit board as shown in Figure 17.
6. Go to “Installing a New Optical Unit” on page 28 to complete the installation.
4
071
.
50
.
030
GAS
K
E
T
SLEEVE
F
RC
/FT
Z
/FT
D
/F
EDD
4
071
.
50
.
052
PR
I
SM
K
EEPER
PLA
T
E
,
,
,
63A0979
-
1
PR
I
SM
F-
RANGE
W
I
DE
BEAM
63A0993
-
2
PR
I
SM
F-
RNG
NARR
BM
OP
T
GLASS
63A0986
PR
I
SM
F
LA
T
SEAL
F-
RANGE
6
4
A0936
-
13
S
H
OULDER
SCREW
7080
.
90
.
335
O
-
R
I
NG
F-
RANGE
FI
X
T
URES
44
A6760
-
1120
44
A6760
-
2120
.
44
A6760
-
2220
.
44
A6760
-
2320
*
44
A6760
-
1130
44
A6760
-
1220
44
A6760
-
1230
44
A6760
-
2130
44
A6760
-
2230
2
2
2
q
t
y
2
2
Or
d
er
Co
d
es
Associ
a
te
d
Pris
m
Top Cover
Assembly
Screw
