B. If the fault symptom is identified by the maintenance message: DRIFT TRANSF-PRESS XDCR 7HA1
-do a check of the status of the AIR BLEED/ENG 1/MONG circuit breaker (2HA1).
(1) If the circuit breaker is closed:
-do a check for 28VDC at pin A/1 of the bleed transferred pressure transducer (7HA1) (Ref. ASM 36-11/01).
(a) If there is no 28VDC:
-do a check for ground at pin A/2 of the bleed transferred pressure transducer (7HA1) (Ref. ASM 36-11/01).
1 If there is no ground:
_
-repair the wiring between pin A/2 of the bleed transferred pressure transducer (7HA1) and the ground (Ref. ASM 36-11/01).
2 If there is ground:
_
-do a check of the wiring between pin A/1 of the bleed transferred pressure transducer (7HA1) and the AIR BLEED/ENG 1/MONG circuit breaker (2HA1) (Ref. ASM 36-11/01).
a If there is no continuity:
_ -repair the wiring.
b If there is continuity:
_ -replace the C/B-AIR BLEED/ENG 1/MONG (Ref. ASM 36-11/01).
3 If the fault continues:
_
-make sure that there is a 0 psig output signal (0.9VDC) at the BMC1 (1HA1) connector between pins AA/14B and AA/15B.
a If there is no 0.9VDC:
_
-replace the XDCR-BLEED TRANSFER PRESS, ENG 1 (7HA1) (Ref. AMM TASK 36-11-15-000-001) and (Ref. AMM TASK 36-11-15-400-001).
4 If the fault continues:
_
-do a check and repair the wiring between pins A/3 and A/4 of the bleed transferred pressure transducer (7HA1) and pins AA/14B and AA/15B of the BMC1 (1HA1) (Ref. ASM 36-11/01).
(b) If there is 28VDC:
-replace the XDCR-BLEED TRANSFER PRESS, ENG 1 (7HA1) (Ref. AMM TASK 36-11-15-000-001) and (Ref. AMM TASK 36-11-15-400-001).
1
R -EFF : 106-149, 229-299, 303-399, 401-499,
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B241
--Aug 01/05 ---CES -
(2) If the circuit breaker is open:
-close the circuit breaker.
(a) If the circuit breaker trips:
-replace the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-000-001) and (Ref. AMM TASK 36-11-34-400-001).
1_ If the fault continues:
- do a check of the wiring for a short to ground between pin
A/1 of the bleed transferred pressure transducer (7HA1) and
the AIR BLEED/ENG1/MONG circuit breaker (2HA1) (Ref. ASM 36-
11/01).
a If there is a short to ground:
_
-repair the wiring. b If there is no short to ground:
_ -replace the C/B-AIR BLEED/ENG 1/MONG (Ref. ASM 36-11/01).
(b) If the circuit breaker stays closed and the fault continues:
-replace the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-000-001) and (Ref. AMM TASK 36-11-34-400-001).
C. After the subsequent flight, make sure that the fault does not continue.
1
R -EFF : 106-149, 229-299, 303-399, 401-499,
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B242
--Aug 01/05 ---CES - Drift of the Engine 2 Bleed Transferred Pressure Transducer
1. Possible Causes
_______________
-XDCR-BLEED TRANSFER PRESS, ENG 2 (7HA2)
-BMC-2 (1HA2)
-wiring
-C/B-AIR BLEED/ENG 2/MONG
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 36-11-15-000-001 Removal of the Bleed Transferred Pressure Transducer (7HA1,7HA2) AMM 36-11-15-400-001 Installation of the Bleed Transferred Pressure
Transducer (7HA1,7HA2) AMM 36-11-34-000-001 Removal of the BMC (1HA1, 1HA2) AMM 36-11-34-400-001 Installation of the BMC (1HA1, 1HA2) ASM 36-11/02
3. Fault Confirmation
__________________
A. Test
(1) Not applicable.
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
122VU AIR BLEED/ENG 2/MONG 2HA2 Z22
1
R -EFF : 106-149, 229-299, 303-399, 401-499,
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B243
--Aug 01/05 ---CES -
B. If the fault symptom is identified by the maintenance message: DRIFT TRANSF-PRESS XDCR 7HA2
-do a check of the status of the AIR BLEED/ENG 2/MONG circuit breaker (2HA2).
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