NAVIGATION LIGHTS - FAULT ISOLATION PROCEDURES
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 TASK 33-41-00-810-801
 Navigation Lights - Fault in the Navigation Lights
 1. Possible Causes
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 - LT-NAVIGATION, TAIL (15LA)

 - XFMR-TAIL NAVIGATION LIGHT (13LA)

 - LT-NAVIGATION, L WING TIP (9LA)

 - LT-NAVIGATION, R WING TIP (10LA)

 - lamp

 - wiring

 - RELAY (6LA)

 - RELAY (7LA)

 - SWITCH (3LA)

 2. Job Set-up Information
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 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 33-41-00-710-001 Operational Test of the Navigation Lights AMM 33-41-11-000-001 Removal of the Wingtip Navigation Light 9LA(10LA). AMM 33-41-11-400-001 Installation of the Wingtip Navigation Light
 9LA(10LA). AMM 33-41-15-000-001 Removal of the Tail Navigation Light 15LA AMM 33-41-15-400-001 Installation of the Tail Navigation Light 15LA AMM 33-41-16-000-001 Removal of the Tail Navigation-Light Transformer 13LA AMM 33-41-16-400-001 Installation of the Tail Navigation-Light Transformer
 13LA ASM 33-41/01
 3. Fault Confirmation
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 A. Do the operational test of the navigation lights (Ref. AMM TASK 33-41-00-710-001).

 4. Fault Isolation
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 A. With the toggle switch NAV & LOGO 3LA in position 1.
 (1) If the LT-NAVIGATION, TAIL (15LA) does not come on, but one or more navigation lights come on:

 - replace the related lamp.
 (a) If the fault continues:

 - do a check of the LT-NAVIGATION, TAIL (15LA) and replace it if necessary (Ref. AMM TASK 33-41-15-000-001) and (Ref. AMM TASK 33-41-15-400-001).

 (b) If the fault continues:

 - do a check of the XFMR-TAIL NAVIGATION LIGHT (13LA) and replace it if necessary (Ref. AMM TASK 33-41-16-000-001) and (Ref. AMM TASK 33-41-16-400-001).

 (c) If the fault continues:

 - do a check and repair the wiring between: LT-NAVIGATION, TAIL (15LA) connector A/1 and XFMR-TAIL NAVIGATION LIGHT (13LA) connector A/1, XFMR-TAIL NAVIGATION LIGHT (13LA) connector A/1 and RELAY (6LA) connector A/1, LT-NAVIGATION, TAIL (15LA) connector A/2 and XFMR-TAIL NAVIGATION LIGHT (13LA) connector A/2, XFMR-TAIL NAVIGATION LIGHT (13LA) connector A/2 and GND (Ref. ASM 33-41/01).

 (2) If the LT-NAVIGATION, L WING TIP (9LA) does not come on, but one or more navigation lights come on:

 - replace the related lamp.
 (a) If the fault continues:

 - do a check of the LT-NAVIGATION, L WING TIP (9LA) and replace it if necessary (Ref. AMM TASK 33-41-11-000-001) and (Ref. AMM TASK 33-41-11-400-001).

 (b) If the fault continues:

 - do a check and repair the wiring between: LT-NAVIGATION, L WING TIP (9LA) connector A/A and RELAY (6LA) connector A/1 LT-NAVIGATION, L WING TIP (9LA) connector A/B and GND (Ref. ASM 33-41/01).

 (3) If the LT-NAVIGATION, R WING TIP (10LA) does not come on, but one or more navigation lights come on:

 - replace the related lamp.
 (a) If the fault continues:

 - do a check of the LT-NAVIGATION, R WING TIP (10LA) and replace it if necessary (Ref. AMM TASK 33-41-11-000-001) and (Ref. AMM TASK 33-41-11-400-001).

 (b) If the fault continues:

 - do a check and repair the wiring between: LT-NAVIGATION, R WING TIP (10LA) connector A/A and RELAY (6LA) connector B/1, LT-NAVIGATION, R WING TIP (10LA) connector A/B and GND (Ref. ASM 33-41/01).

 (4) If no navigation lights come on:

 - do a check of the RELAY 6LA and replace it if necessary.
 (a) If the fault continues:

 - do a check of the SWITCH 3LA and replace it if necessary.

 (b) If the fault continues:

 - do a check and repair the wiring between: RELAY (6LA) connector A/2 and CB 1LA, RELAY (6LA) connector B/2 and CB 1LA, RELAY (6LA) connector X/1 and CB 1LA, RELAY (6LA) connector X/2 and GND (Ref. ASM 33-41/01).
 B. With the toggle switch NAV & LOGO 3LA in position 2.
 (1) If the LT-NAVIGATION, TAIL (15LA) does not come on, but one or more navigation lights come on:
 - replace the related lamp.
 (a) If the fault continues:

 - do a check of the LT-NAVIGATION, TAIL (15LA) and replace it if necessary (Ref. AMM TASK 33-41-15-000-001) and (Ref. AMM TASK 33-41-15-400-001).
　
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