WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE LEADING EDGE FLAP AND SLAT LOCKS CORRECTLY. THE LEADING EDGE FLAPS AND SLATS CAN MOVE QUICKLY IF YOU DO NOT REMOVE THE LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(5) Do this task: "Leading Edge Flap and Slat Locks Removal" (AMM\27-81-00/MP).
Aug 01/95 33-42-21
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
INBOARD LANDING LIGHTS - MAINTENANCE PRACTICES
1. General
A. The following procedure is for relamping the inboard landing lights. Adjustment after relamping is usually not required unless the mount or the adjustment screws have been disturbed.
B. The landing and runway turnoff light-lens assembly is sealed to keep out water and fuel vapor (Ref 33-42-21, R/I).
2. Equipment and Materials
A. Compound, Standard Wiring Practices Manual (SWPM), 20-30-00
B. Cleaning Solvent - Keytone
C. Teflon Tape - Permacel No. 422/4220
D. Lock Assembly, Flight Controls - F80048-1, -2
3. References
A. MM 33-42-21 R/I Inboard Landing and Runway Turnoff Light
B. MM 27-51-0 MP Trailing Edge Flaps
C. MM 27-81-0 MP Leading Edge Flaps and Slats
D. Standard Wiring Practices Manual (SWPM), 20-30-00
4. Prepare Inboard Landing Light for Relamping (Fig. 201)
A. Retract and lock leading edge flaps as follows:
(1)
Install flight controls lock on leading edge devices shutoff valve at standby hydraulic module (Ref 27-81-0, MP).
(2)
Install flight controls lock on trailing edge bypass valve (Ref 27-51-0, MP).
(3)
Check that alternate flaps arm switch is in OFF position and tag switch DO NOT OPERATE.
WARNING: INSTALL FLIGHT CONTROLS LOCKS WHEN MAINTENANCE IS BEING PERFORMED IN THE WING LEADING EDGE AREA. FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
B. Remove landing light lens assembly (Ref 33-42-21, R/I).
C. Open INBD R and L inboard landing light circuit breakers on P18-3 panel.
5. Relamp Inboard Landing Light (Fig. 201)
A. Remove retainer by removing six retainer screws.
NOTE: Do not turn adjustment screws.
B. Remove lamp from landing light frame.
C. Disconnect wires from screw terminals on lamp.
D. Remove gasket from lamp and install gasket on replacement lamp.
NOTE: To install gasket, the gasket should be wiped clean with Keytone, or equivalent cleaning solvent. Then holding one end of gasket on rim of lamp, wrap gasket around lamp (keeping sufficient tension to cause gasket to form itself to the contour of the lamp) until ends of gasket are overlapped. If required, cut off excess gasket material so the overlap is approximately 1 inch. A piece of teflon tape may be used to retain overlapping gasket in position so that gasket will not come loose during lamp installation.
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Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-42-31 Page 201
K42027
Inboard Landing Lights Relamping 592
33-42-31 Figure 201 Oct 20/85
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
E. Connect wires to screw terminals on replacement lamp.
F. Seal the electrical terminals for a fuel vapor area (SWPM 20-30-00).
WARNING: MAKE SURE YOU SEAL EACH BARE ELECTRICAL CONNECTION TO PREVENT AN EXPLOSION OF THE FUEL FUMES. AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
G. Set lamp in landing light frame.
NOTE: When Q4559 (quartz halogen) lamp is used, install lamp with filament horizontal. When 4559 (tungsten filament) lamp is used, install lamp with filament shield inboard.
H. Place retainer on lamp, aligning holes with holes in frame, and instal1 six retainer screws.
6. Restore Airplane to Normal Configuration
A. Close applicable inboard landing light circuit breaker on P18-3 panel.
B. Test inboard landing lights.
(1)
Provide electrical power.
(2)
On forward overhead panel place inboard landing light switch to ON; check that both landing lights come on and illuminate symmetrical areas ahead of the airplane; and return inboard landing light switch to OFF.
CAUTION: DO NOT LEAVE LIGHTS ON MORE THAN 5 MINUTES. ALLOW AT LEAST 5 MINUTES BEFORE TURNING ON AGAIN.
(3)
Remove electrical power if no longer required.
C. Clean inside of lens with cloth.
D. Install lens assembly (Ref 33-42-21, R/I).
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