© ADB Airfield Solutions All Rights Reserved 19
2.4.2 Repair Procedures
2.4.2.1 Opening the Optical Unit To open the optical unit, perform the following procedure:
1. Turn the light unit upside-down.
2. See Figure 7. Remove the pressure release screw.
NOTE: Removing the pressure release screw equalizes the pressure inside and outside the
fixture, making it easier to break the seal and remove the inner cover.
Figure 7: Pressure Release Screw
3. Remove the 4 screws. The use of an impact driver may be required to unlock the screws.
Figure 8: Removing Screws
4. Insert small or medium flat blade screwdriver in the machined recess slot between cover
and inner cover and turn it vertically to separate the inner cover from the top cover.
Figure 9: Separating Inner Cover from Top Cover
60A2602
PRESSURE RELEASE SCREW F-RANGE
63B0267-011
O RING L852A/B/C/D
4 PLACES
HEATER ASSEMBLIES
M5 X 10 FLT PHIL SS
APPLY SILICONE
GREASE 67A0009
TO O-RING ON TOP
COVER ASSEMBLY.
W/MON, 1 CDST
7080.90.335
O-RING F-RANGE
FIXTURES
Screw in center slot
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