Loss of the Bleed Regulated-Pressure Transducer of the Engine 1 (Detected by BMC2)

TASK 36-11-00-810-926-A
Loss of the Bleed Regulated-Pressure Transducer of the Engine 1 (Detected by BMC2)

1. Possible Causes

wiring between pin A/2 of the bleed regulated-pressure transducer (8HA1) and the ground terminal
wiring between pin A/1 of the bleed regulated-pressure transducer (8HA1) and the circuit breaker (2HA1)
wiring
C/B-AIR BLEED/ENG 1/MONG [2HA1]
XDCR-BLEED REGULATED PRESS, ENG 1 [8HA1]
wiring from the bleed regulated-pressure transducer (8HA1) to the BMC1 (1HA1)
BMC-2 [1HA2]

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 36-11-16-000-001	Removal of the Bleed Regulated Pressure-Transducer
AMM 36-11-16-400-001	Installation of the Bleed Regulated Pressure-Transducer

3. Fault Confirmation
Subtask 36-11-00-710-364-A ** ON A/C NOT FOR ALL

A. Test
(1) Not Applicable

4. Fault Isolation
Subtask 36-11-00-865-063-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 36-11-00-810-214-A ** ON A/C NOT FOR ALL

B. If the fault symptom is identified by the maintenance message:
REG-PRESS XDCR 8HA1

(1) If the circuit breaker is closed:

Do a check for 28VDC at pin A/1 of the bleed regulated-pressure transducer (8HA1) ASM 361101.

(a) If there is no 28VDC:

Do a check for ground at pin A/2 of the bleed regulated-pressure transducer (8HA1).

1 If there is no ground signal:

Repair the wiring between pin A/2 of the bleed regulated-pressure transducer (8HA1) and the ground terminal.

2 If there is a ground signal:

Do a check of the wiring between pin A/1 of the bleed regulated-pressure transducer (8HA1) and the circuit breaker (2HA1).

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) on the BMC1 (1HA1) connector between pins AA/11B and AA/12B.

a If there is no 0.9VDC:

Replace the XDCR-BLEED REGULATED PRESS, ENG 1 [8HA1] AMM 36-11-16-000-001 and AMM 36-11-16-400-001.

4 If the fault continues:

Do a check and repair the wiring from the bleed regulated-pressure transducer (8HA1) to the BMC1 (1HA1), pins A/3 and A/4 to pins AA/12B and AA/11B.

(b) If there is 28VDC:

(2) If the circuit breaker is open:

(a) If the fault continues:

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

Subtask 36-11-00-710-365-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 04:33:50 UTC