Ceiling-Mounted Exit Light 509
33-51-91 Figure 401 Feb 15/80
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CEILING-MOUNTED EXIT SIGN - MAINTENANCE PRACTICES
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. General (Fig. 201)
A. The hinged ceiling-mounted exit signs are powered by a battery pack located above and inboard of the exit signs. Each sign is hinged on its upper surface and opens for relamping or replacement.
2. Relamp Sign (Fig. 201)
A. Place emergency light switch on pilots' overhead panel to OFF.
B. Insert a 5/64-inch hex key (Allen wrench or equivalent) in each of two small holes in lower edge of sign and release fasteners.
C. Rotate sign (legend-half) upward exposing lamp retaining screws.
D. Replace lamps.
E. Rotate sign (legend-half) downward and secure fasteners.
F. Restore switch on pilots' panel to original position if required.
3. Remove Sign (Fig. 201)
A. Place emergency light switch on pilots' overhead panel to OFF.
B. Insert 5/64-inch hex key (Allen wrench or equivalent) in each of two small holes in lower edge of sign and release fasteners.
C. Rotate sign (legend-half) upward exposing two mounting screws.
D. Remove two mounting screws and pull sign away from installation for access to electrical terminals on back of sign.
CAUTION: SUPPORT SIGN TO PREVENT DAMAGE TO ELECTRICAL WIRING.
E. Disconnect electrical wires from rear of sign and remove sign.
Aug 01/75 33-51-92 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Ceiling Mounted Exit Sign 501
33-51-92 Figure 201 Aug 1/75
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PORTABLE EMERGENCY EXIT LIGHT - MAINTENANCE PRACTICES
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. General (Fig. 201)
A. Portable emergency lights that may be removed from their mountings and used as a flashlight are installed over the control cabin, entry and galley doors. They also may be installed over each emergency escape hatch. When installing the light, the control switch should be turned to the ARMED position. If the lamps are illuminated with the switch in the ARMED position, turn the control switch to ON and then back to the ARMED position.
B. The portable light assembly will come on and discharge its batteries if removed from mounting plate with pilot's emergency light switch set to ARMED. If emergency light comes on when removed from mounting plate, set switch on light assembly to ON then to ARM. Light will go off.
2. Remove Light Assembly (Fig. 201)
A. Turn off emergency lights switch on pilots' overhead panel and tag switch.
B. Open emergency light POWER and CONTROL circuit breakers on P18-3 panel.
C. Pull plastic cover out of engagement.
D. Press in on latch levers and pull light assembly to remove.
3. Replace Batteries (Fig. 201)
A. Remove two screws and remove back cover from light assembly.
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