(b) If the circuit breaker (2GS) stays closed and if the fault continues:
 - replace the CONTACTOR-BRK FAN, R (6GS).
 B. Test Do the test given in Para. 3.A.(1).

 TASK 32-48-00-810-804
 Brake Fans Inoperative on All the Wheels
 1. Possible Causes
_______________
 - LGCIU-2 (5GA2)

 - wiring between the BRK FAN pushbutton switch (4GS) pin A/B1 and the first terminal block

 - wiring from the LGCIU2 (5GA2) pin AB/6F to the first terminal block

 - BRK FAN pushbutton switch (4GS)

 - wiring from the BRK FAN pushbutton switch (4GS) to the circuit breaker (3GS)

 - C/B-HYDRAULIC/BRK FAN/CTL (3GS)

 - P/BSW-BRK FAN CONTROL (4GS)

 - CONTACTOR-BRK FAN,l (5GS)

 - CONTACTOR-BRK FAN,R (6GS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 AMM 32-48-00-710-001 Functional Test of The Brake Cooling System
 ASM 32-48/01

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the brake cooling system (Ref. AMM TASK 32-48-00-710-001).

 (a) If the circuit breaker (3GS) trips:
 - refer to Para. 4.A.(2).

 (2) Make sure that the fans do not operate on the four wheels.

 4. Fault Isolation
_______________
 A. If the test confirms the fault:
 - do a check of the circuit breaker (3GS) status:
 (1) If the circuit breaker (3GS) is closed:
 - do a check for 28VDC at pin A/B1 of the BRK FAN pushbutton switch (4GS) (P/BSW (4GS) pushed) (Ref. ASM 32-48/01).
 (a) If there is 28VDC:
 - do a check of the wiring between the BRK FAN pushbutton switch (4GS) pin A/B1 and the first terminal block (Ref. ASM 32-48/01).
 1 If there is no continuity:
_ - repair the related wiring.

 2 If there is continuity:
_

 - do a check for a ground signal at pin AB/6F of the LGCIU2 (5GA2) (Ref. ASM 32-48/01).
 a If there is no ground signal:
_

 - replace the LGCIU-2 (5GA2) (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 (b) If there is a ground signal:

 - do a check and repair the wiring from the LGCIU2 (5GA2) pin AB/6F to the first terminal block (Ref. ASM 32-48/01).

 (c) If there is no 28VDC:

 - replace the BRK FAN pushbutton switch (4GS).
 1 If the fault continues:
_

 - do a check of the wiring from the BRK FAN pushbutton switch (4GS) to the circuit breaker (3GS) pin A/B3 to pin 2 (Ref. ASM 32-48/01).
 a If there is no continuity:
_

 - repair the above related wiring.
 b If there is continuity:
_ - replace the C/B-HYDRAULIC/BRK FAN/CTL (3GS).

 (2) If the circuit breaker (3GS) is open:
 - close it.

 (a) If it trips:
 - replace the P/BSW-BRK FAN CONTROL (4GS) or CONTACTOR-BRK FAN,l (5GS) or CONTACTOR-BRK FAN,R (6GS) or LGCIU-2 (5GA2) (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001)
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 301-399, 401-499, ∞∞32-48-00∞∞∞∞∞∞∞∞∞∞Page 210
 Aug 01/05 CES a If there is a short to ground:

 1_ If the fault continues:
 - do a check for a short to ground at:
 . the wiring from the circuit breaker (3GS) to the BRK FAN
 pushbutton switch (4GS> pin 2 to pin A/B3
 . the wiring from the BRK FAN pushbutton switch (4GS) pin
 A/B1 to the first terminal block
 . the wiring from the LGCIU2 (5GA2) pin AB/6F to the first
 terminal block (Ref. ASM 32-48/01).

_

 - repair the above related wiring. b If there is no short to ground:
_ - replace the C/B-HYDRAULIC/BRK FAN/CTL (3GS).

 (b) If the circuit breaker stays closed and if the fault continues:
 - replace the P/BSW-BRK FAN CONTROL (4GS).
 B. Test
 - do the test given in Para. 3.A.

 TIRE PRESSURE INDICATING SYSTEM (TPIS) - FAULT ISOLATION PROCEDURES
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