Low Bleed Pressure of the Engine 1 in Descent/Taxi

TASK 36-11-00-810-875-A
Low Bleed Pressure of the Engine 1 in Descent/Taxi

1. Possible Causes

VALVE-HP BLEED [4000HA]
sense line between the bleed-pressure regulator-valve control-solenoid (10HA1) and the bleed pressure-regulator valve (4001HA)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-11-00-740-001	BITE Test of the BMC 1(2)
AMM 36-11-49-000-026	Removal of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface
AMM 36-11-49-400-026	Installation of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface
AMM 36-11-51-000-042	Removal of the High Pressure Bleed Valve
AMM 36-11-51-400-042	Installation of the High Pressure Bleed Valve

3. Fault Confirmation
Subtask 36-11-00-710-197-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the BMC1 AMM 36-11-00-740-001.

4. Fault Isolation
Subtask 36-11-00-810-125-C ** ON A/C NOT FOR ALL

A. If the test gives a maintenance message:

Do the trouble shooting procedure related to the maintenance message.

(1) If there is no maintenance message:

replace the VALVE-HP BLEED [4000HA] AMM 36-11-51-000-042 and AMM 36-11-51-400-042.

CAUTION: USE TWO WRENCHES DURING DISCONNECTION OF THE SENSE LINE, ONE TO MAINTAIN THE FIXED NUT AND THE SECOND ONE TO LOOSEN/TIGHTEN THE SENSE LINE COUPLING.

CAUTION: BE CAREFUL WITH THE SEMI-FLEXIBLE SENSE LINE. DEFORMATION OF THE RIGID PART OR LARGE DEFORMATION OF THE FLEXIBLE PART CAN QUICKLY CAUSE LEAKAGE.

(a) If the fault continues:

Replace the sense line between the bleed-pressure regulator-valve control-solenoid (10HA1) and the bleed pressure-regulator valve (4001HA) AMM 36-11-49-000-026 and AMM 36-11-49-400-026.

Subtask 36-11-00-710-198-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