Drift of the Engine 1 Bleed Transferred Pressure Transducer

TASK 36-11-00-810-955-A
Drift of the Engine 1 Bleed Transferred Pressure Transducer

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
ASM 361101
AMM 36-11-15-000-001	Removal of the Bleed Transferred Pressure-Transducer
AMM 36-11-15-400-001	Installation of the Bleed Transferred Pressure-Transducer
AMM 36-11-34-000-001	Removal of the BMC
AMM 36-11-34-400-001	Installation of the BMC

3. Fault Confirmation
Subtask 36-11-00-740-065-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable.

4. Fault Isolation
Subtask 36-11-00-865-070-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11

Subtask 36-11-00-810-249-A ** ON A/C NOT FOR ALL

B. If the fault symptom is identified by the maintenance message:
DRIFT TRANSF-PRESS XDCR 7HA1

(1) If the circuit breaker is closed:

Do a check for 28VDC at pin A/1 of the bleed transferred pressure transducer (7HA1) ASM 361101.

(a) If there is no 28VDC:

Do a check for ground at pin A/2 of the bleed transferred pressure transducer (7HA1) ASM 361101.

1 If there is no ground:

Repair the wiring between pin A/2 of the bleed transferred pressure transducer (7HA1) and the ground ASM 361101.

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) ASM 361101.

a If there is no continuity:

b If there is continuity:

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] AMM 36-11-15-000-001 and AMM 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) ASM 361101.

(b) If there is 28VDC:

Replace the XDCR-BLEED TRANSFER PRESS, ENG 1 [7HA1] AMM 36-11-15-000-001 and AMM 36-11-15-400-001.

(2) If the circuit breaker is open:

(a) If the fault continues:

(b) If the circuit breaker stays closed and the fault continues:

Subtask 36-11-00-740-066-A ** ON A/C NOT FOR ALL

C. After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:33:51 UTC