Replacing Optical Unit - ADB F-Range L-850C Manual

F-Range Type L-850C Style 3 Inset Lights
5. Replacing Prism
(contd.)

6. Replacing Optical Unit

 2006 ADB Airfield Solutions, Incorporated
All rights reserved
2. Remove the prism-keeper plate (B5) and the flat seal (B4).
3. Push the prism (B3) with the sock seal (B2) towards the inside of
the cover.
4. Clean and degrease the prism chamber with any effective
solvent.
Never use any abrasive substance. This will scratch or frost
the prism.
5. Apply a thin layer of lubricant MOLYKOTE (67A0095) BG87
INERTA or MOLYKOTE (67A0095) BG88 INERTA in the prism
chamber using a small brush.
6. Install a new sock seal (B2) over the prism (B3).
7. Push the prism/gasket assembly in the prism pocket from the
inside and clean the inner surface of the prism.
8. Install a new flat seal (B4) over the prism-keeper plate (B5).
9. Reinstall hardware with the Phillips pan head screws (B7). Apply
a droplet of sealant Loctite 270 to the last threads. Torque to 3.5
 0.5 Nt-m (31  4 inch-pounds).
Refer to Table 6-1 in Replacing Lamp and Filter in this section for
parts referred to in Figure 6-4.
To replace the optical unit, perform the following procedure:
1. Remove the lamp(s). Refer to Replacing Lamp and Filter in this
section.
2. See Figure 6-4. Remove the optical unit (1) by loosening
screws (5).
3. Position the new optical unit with new grommets (4).
NOTE: See Figure 2-3. Lamps and lamp holders must be
assembled to the same side of the optical bracket labeled "THIS
SIDE UP".
4. Torque the fixing screws to 3.5  0.5 Nt-m (31  4 inch-pounds).
96A0285D
Issued 04/13
Repair
Page 6-13