Emergency Lights 535
33-51-01 Figure 2 (Sheet 1) Feb 15/72
Page 10
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
535 Emergency Lights
Aug 15/72 Figure 2 (Sheet 2) 33-51-01
Page 11
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY LIGHTING - TROUBLE SHOOTING
1. General
A. Trouble shooting procedures are based on the assumption that wiring is OX and electrical power is available. If corrective action in procedure does not correct problem, check wiring using the wiring diagram. When failure of a group of emergency lights is noted, the wiring diagram manual should be consulted to isolate the wire(s) common to those failed lights.
B. Trouble Shooting Tips
(1)
All power supply modules are similar to self-contained light modules in operation and control except they do not have internal lamps.
(2)
Circuit control and wiring status can be accomplished by disconnecting any self-contained emergency light module and checking inputs to airplane wire bundle connector pins 2, 3, and 4. Emergency light switches and emergency light charging power circuit breakers provide controls for this check. Figure 1010 tabulates data for check.
(3)
It is recommended that an electrical check for 28-volt dc charging power availability be performed as part of replacement for any malfunctioning light or power supply module.
(4)
Battery power supplies may have fuses which are replaceable after battery pack is removed. Fuses should be checked before replacing battery pack. If fuse is blown, check for a short circuit to lighting fixture and repair wiring as necessary, then replace fuse.
2. Prepare for Trouble Shooting
A. Verify that the following circuit breakers are closed on P18-3 panel:
EMERGENCY EXIT, P2R
EMERGENCY EXIT, CONT
B. Verify that EMER EXIT LIGHTS switch on pilot's overhead panel, P5, is OFF.
C. Verify that EMER lights switch on attendants panel is set to NORMAL.
D. Provide electrical power.
NOTE: Even though charging current is supplied to emergency lights when there is power to the airplane and lights are on, batteries will discharge faster than they are being charged. Do not leave emergency lights on any longer than necessary to trouble shoot system.
504
Nov 15/78 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-51-01 Page 101
Charging and Control Verification Data 504
33-51-01 Figure 101 Aug 15/80
Page 102
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Trouble Shooting Charts
CAUTION: DO NOT LEAVE EMERGENCY LIGHTS ON ANY LONGER THAN ABSOLUTELY NECESSARY TO ACCOMPLISH TROUBLE SHOOTING. EMERGENCY LIGHT SYSTEM BATTERIES MAY DISCHARGE AND REQUIRE RECHARGING.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
One emergency Faulty logic circuit in Verify that switch on portable Replace
light is on when light or power supply emergency lights is set to emergency light or
EMER EXIT ARM. If not, set switch to ON battery pack power
LIGHTS switch is then back to ARM. Check that supply
in OFF position. light operates.
All emergency Circuitry fails to disarm Check that EMERGENCY Replace EMER
lights on when LIGHTS switch on the aft EXIT LIGHT switch
EMER EXIT attendant’s panel is in on pilot’s overhead
LIGHT switch is in NORMAL position. panel.
OFF position
Emergency lights No voltage on charge/ None Replace EMER
come on when monitor wire EXIT LIGHTS
EMER EXIT switch.
LIGHT switch is
placed in ARMED
position (power
supplied to
airplane).
Emergency lights Emergency light circuitry Place EMERGENCY LIGHT
do not come on fails to arm. switch on aft attendant’s
with EMER EXIT panel in ON position.
LIGHT switch in ARMED position and no power to airplane. (Opening EMERGENCY If emergency lights come on EMER EXIT LIGHTS switch probably faulty. If emergency lights do not Replace EMER EXIT LIGHTS switch on pilot’s overhead panel.
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