Low Bleed Temperature of the Engine 1 in Descent

TASK 36-11-00-810-888-A
Low Bleed Temperature of the Engine 1 in Descent

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-11-00-740-001	BITE Test of the BMC 1(2)
ASM 361101
AMM 36-11-17-000-001	Removal of the Heat-Exchanger Outlet-Temperature Sensor
AMM 36-11-17-400-001	Installation of the Heat-Exchanger Outlet-Temperature Sensor
AMM 36-11-51-000-040	Removal of the High Pressure Bleed Valve
AMM 36-11-51-000-042	Removal of the High Pressure Bleed Valve
AMM 36-11-51-400-040	Installation of the High Pressure Bleed Valve
AMM 36-11-51-400-042	Installation of the High Pressure Bleed Valve

3. Fault Confirmation
Subtask 36-11-00-710-223-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the BMC 1 AMM 36-11-00-740-001.

4. Fault Isolation
Subtask 36-11-00-810-138-A ** ON A/C NOT FOR ALL

A. If the BITE test gives no maintenance message:

(1) If the BITE test gives the class 3 maintenance message:
TEMP SENSOR 6HA1

Replace the SENSOR-EXCHANGER OUT TEMP, ENG 1 [6HA1] AMM 36-11-17-000-001 and AMM 36-11-17-400-001.

(a) If the fault continues:

Do a check and repair the wiring ASM 361101 between:
. pin 4 of the engine 1 exchanger output temperature sensor (6HA1) and pin AA/10B of the BMC 1 (1HA1)
. pin 2 of the engine 1 exchanger output temperature sensor and pin AA/9B of the BMC 1
. pin 1 and the ground.

(2) If the BITE test gives the class 3 maintenance message:
HP BLEED-V 4000HA1

Replace the VALVE-HP BLEED [4000HA] of the engine 1 AMM 36-11-51-000-040 and AMM 36-11-51-400-040.

Subtask 36-11-00-810-138-B ** ON A/C NOT FOR ALL

A. If the BITE test gives no maintenance message:

(1) If the BITE test gives the class 3 maintenance message:
TEMP SENSOR 6HA1

Replace the SENSOR-EXCHANGER OUT TEMP, ENG 1 [6HA1] AMM 36-11-17-000-001 and AMM 36-11-17-400-001.

(a) If the fault continues:

Do a check and repair the wiring ASM 361101 between:
. pin 4 of the engine 1 exchanger output temperature sensor (6HA1) and pin AA/10B of the BMC 1 (1HA1)
. pin 2 of the engine 1 exchanger output temperature sensor and pin AA/9B of the BMC 1
. pin 1 and the ground.

(2) If the BITE test gives the class 3 maintenance message:
HP BLEED-V 4000HA1

Replace the VALVE-HP BLEED [4000HA] of the engine 1 AMM 36-11-51-000-042 and AMM 36-11-51-400-042.

Subtask 36-11-00-710-224-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:33:47 UTC