Tail Strobe Light Relamping 543
33-45-21 Figure 201 Feb 15/73
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TAIL STROBE LIGHT - REMOVAL/INSTALLATION
1. General
A. The following procedures provide instructions for replacing the tail mounted strobe light. The strobe light fits within a tube mounted on the fuselage. The tube must be removed before the strobe light can be replaced.
WARNING: HIGH VOLTAGE IS PRESENT AT LAMP TERMINALS. WAIT 5 MINUTES AFTER SYSTEM IS OFF BEFORE REMOVING STROBE LIGHT.
2. Remove Tail Strobe Light (Fig. 401)
A. Open POSITION-STROBE circuit breaker on P18-3 panel.
B. Remove eight tube mounting screws and pull tube-strobe light assembly aft to expose electrical wiring and connector.
C. Disconnect electrical connector from strobe light.
D. Remove eight mounting bolts retaining strobe light in tube and slide strobe light out of tube.
3. Install Tail Strobe Light (Fig. 401)
A. Slide strobe light into tube and install eight mounting bolts.
B. Connect electrical connector to strobe light.
C. Place tube-strobe light assembly in position on fuselage tail cone and install eight screws.
D. Close circuit breaker opened in step 2.A.
E. Test tail strobe light.
(1)
Provide electrical power.
(2)
Place POSITION light switch to STROBE & STEADY. Observe strobe lights flash. Return switch to OFF.
WARNING: DO NOT LOOK DIRECTLY AT LIGHT FROM CLOSE RANGE. LIGHT FLASHES MAY CAUSE TEMPORARY VISION IMPAIRMENT.
(3)
Remove electrical power if no longer required.
543
Nov 01/75 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-45-21 Page 401
Tail Strobe Light Installation 543
33-45-21 Figure 401 Feb 15/73
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY LIGHTING - DESCRIPTION AND OPERATION
EFFECTIVITY
Wide-Body Look and Carry-All Compartment Interior
1. General
A. Emergency lighting is provided in the passenger cabin, lavatories, control cabin, over the inboard wing and on the escape slides. If a partial power failure occurs on the main ac bus or ac transfer bus, some of the ceiling lights are transferred to the essential ac bus. If a complete power failure occurs, certain lights will be illuminated from the battery bus or battery transfer bus and emergency exit lighting Will automatically be illuminated by batteries associated with the light assemblies. A switch on the pilots' overhead panel controls the 28-volt dc hot battery bus power that provides light control and the 28-volt dc bus No. 1 power that charges the batteries. All airplane power is from the P18 load control center (Fig. 1).
2. Control Cabin Lights
A. The white incandescent lights in the pilots' lightshield are normally illuminated from the 28-volt ac essential bus. If essential power fails, two emergency lights in the shield are automatically connected, by the pilots' background lights relay in overhead panel P5, to the battery bus. The control cabin white dome lights and compass light receive power from the battery bus and will remain illuminated in case of generator power failure (Ref 33-11-0, Control Cabin Lighting).
3. Passenger Cabin Ceiling Lights
A. Emergency incandescent lights installed in the fluorescent light assemblies throughout the passenger cabin are normally illuminated from the 28-volt ac transfer bus. If power to the ac transfer bus is lost, the night light relay will de-energize and connect the emergency lights to the 28- volt ac bus No. 2 (Ref 33-21-01, Passenger Cabin Lighting).
B. A dome light in each lavatory is illuminated from the battery bus; therefore, lighting is provided in case of generator power failure.
Nov 15/78 33-51-01 Page 1
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Lights Components Location 535
33-51-01 Figure 1 (Sheet 1) Feb 15/72
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
535 Emergency Lights Component Location
Feb 15/72 Figure 1 (Sheet 2) 33-51-01
Page 3
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Lights Component Location 535
33-51-01 Figure 1 (Sheet 3) Feb 15/72
Page 4
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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