F-Range Type L-850C Style 3 Inset Lights
Maintenance
2006 ADB Airfield Solutions, Incorporated
96A0285D
Page 4-3
All rights reserved
Issued 04/13
2.
Clean the outer surface of the prism (3) using liquid glass
cleaner. If the prism is coated with a substance impervious to the
cleaner, apply a suitable solvent sparingly with a wad of cotton or
a patch of cloth. After the solvent has acted, remove the
softened coating with a clean piece of cotton or cloth. Dry the
prism with gently, dry, oil-free compressed air at a pressure no
greater than 10 psi (69 KNt/m
2
) to evaporate or remove all
remaining cleaner.
When retorquing mounting bolts, apply one drop of Grade AV Loctite
to each of the six 3.8-inch- (9.525-mm-) diameter mounting bolts.
Torque the bolts to 185
5 inch-pounds (20.902
0.565 Nt-m).
Torque the bolts across the corners.
See Figure 4-1. To torque the outer bolts across corners, tighten
bolts in noted sequence: #1 and #4, then #2 and #5, then #3 and #6.
NOTE:
Applying more than one drop of Loctite to the screw and bolt
threads will create future difficulty in removal of the bolts.
NOTE:
After several relampings, threaded holes may accumulate
with dirt and excessive Loctite. If this occurs, screws may not seat
properly. Clean holes with light weight oil or diesel fuel using a small
fiber brush. Wipe the holes clean with alcohol to remove all oil or
diesel fuel and dirt. Clean with dry, oil-free, low-pressure air.
Figure 4-1 Sequence for Torquing Mounting Bolts
Cleaning Light Channel and
Prism
(contd.)
Retorquing Mounting Bolts