Failure of Regulation of the Bleed-Pressure Regulating Valve during Take-Off on Engine 1

TASK 36-11-00-810-972-A
Failure of Regulation of the Bleed-Pressure Regulating Valve during Take-Off on Engine 1

1. Possible Causes

VALVE-OVERPRESSURE, ENG 1 [5HA1]
sense line
VALVE-BLEED PRESS REG [4001HA]
VALVE-HP BLEED [4000HA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-11-00-710-003	Operational Test of the Bleed Air System
AMM 36-11-00-720-010	Functional Test of the Sense Line between the Pressure Regulator Valve and the Pressure-Regulator Valve Control-Solenoid with the Bleed Test Set P/N 99127B03
AMM 36-11-00-720-013	Functional Test of the Sense Line Connected between the Bleed-Pressure Regulator Valve and the Duct Assy with the Bleed Test Set P/N 99127B03
AMM 36-11-00-720-810	Pressure Regulating Test after Overpressure at Take Off Events with Bleed Test Set P/N 98L36103002000
AMM 36-11-49-000-027	Removal of the Sense Line between the Pylon Interface and the Duct Assy
AMM 36-11-49-000-028	Removal of the Sense Line between the Pylon Interface and the Duct Assy
AMM 36-11-49-000-820	Removal of the Pneumatic Sense Lines in the Pylon
AMM 36-11-49-400-027	Installation of the Sense Line between the Pylon Interface and the Duct Assy
AMM 36-11-49-400-028	Installation of the Sense Line between the Pylon Interface and the Duct Assy
AMM 36-11-49-400-820	Installation of the Pneumatic Sense Lines in the Pylon
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
AMM 36-11-52-000-040	Removal of the Bleed Pressure-Regulator Valve
AMM 36-11-52-000-042	Removal of the Bleed Pressure Regulator Valve
AMM 36-11-52-400-040	Installation of the Bleed Pressure-Regulator Valve
AMM 36-11-52-400-042	Installation of the Bleed Pressure Regulator Valve
AMM 36-11-53-000-001	Removal of the Overpressure Valve
AMM 36-11-53-400-001	Installation of the Overpressure Valve
AMM 36-11-53-720-001	Functional Test of the Overpressure Valves with the Bleed Test Set P/N 98D36003000000

3. Fault Confirmation
Subtask 36-11-00-710-433-A ** ON A/C NOT FOR ALL

A. Only do this trouble shooting procedure if is shown the warning message AIR ENG 1 BLEED FAULT and no maintenance message associated is shown.

4. Fault Isolation
Subtask 36-11-00-810-322-A ** ON A/C NOT FOR ALL

A. Functional test

NOTE: The Overpressure Valve (5HA1) is tested in order to verify its correct operation after an overpressure at take-off event.

(1) Do the functional test of the Overpressure Valve (5HA1) AMM 36-11-53-720-001
(a) If the test is not OK:
1 Replace the VALVE-OVERPRESSURE, ENG 1 [5HA1] AMM 36-11-53-000-001 and AMM 36-11-53-400-001.
(b) If the test is OK:
1 Continue the troubleshooting procedure.

Subtask 36-11-00-810-328-A ** ON A/C NOT FOR ALL

B. If the fault continues:
(1) Do the pressure regulating test of the Bleed Pressure Regulator Valve (4001HA) AMM 36-11-00-720-810.
(2) If the reference pressure is lower than 42 psig (2.90 bar):
(a) Do the Functional Test of the Sense Line between the Pressure Regulator Valve and the Pressure-Regulator Valve Control-Solenoid AMM 36-11-00-720-010.
1 If the test is not OK:

Repair the sense line for leakage AMM 36-11-49-000-027 and AMM 36-11-49-400-027.

2 If the test is OK:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-040 and AMM 36-11-52-400-040.

(3) If the reference pressure is above 56 psig (3.86 bar).
(a) For PRV 6774G with sense line 6 installed:
1 Do a functional test of the sense line connected between the bleed pressure regulator valve and the duct assy AMM 36-11-00-720-013.
a If the test is not OK:

Repair the sense line for leakage AMM 36-11-49-000-027 and AMM 36-11-49-400-027.

b If the test is OK:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-040 and AMM 36-11-52-400-040.

(b) For the PRV 6774G without sense line 6 installed:
1 Do a check of the blancking plug of the IPT and RPT.
a If the blanking plug is damaged, replace it.
b If the blanking plug is in the correct condition:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-040 and AMM 36-11-52-400-040.

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-040 and AMM 36-11-52-400-040.

(4) Do an Operational Test of the Bleed Air System AMM 36-11-00-710-003

Subtask 36-11-00-810-329-A ** ON A/C NOT FOR ALL

C. During the five subsequent flights check that the failure does not occur again.
(1) If the fault does not occur again, the failure has been correctly solved with the Test defined.
(2) If the fault continues:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-040 and AMM 36-11-52-400-040.

(3) If the fault continues:

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

Subtask 36-11-00-810-328-C ** ON A/C NOT FOR ALL

D. If the fault continues:
(1) Do the pressure regulating test of the Bleed Pressure Regulator Valve (4001HA) AMM 36-11-00-720-810.
(2) If the reference pressure is lower than 42 psig (2.90 bar):
(a) Do the Functional Test of the Sense Line between the Pressure Regulator Valve and the Pressure-Regulator Valve Control-Solenoid AMM 36-11-00-720-010.
1 If the test is not OK:

Repair the sense line for leakage AMM 36-11-49-000-820 and AMM 36-11-49-400-820.

2 If the test is OK:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-042 and AMM 36-11-52-400-042.

(3) If the reference pressure is above 56 psig (3.86 bar).
(a) For PRV 6774G with sense line 6 installed:
1 Do a functional test of the sense line connected between the bleed pressureregulator valve and the duct assy AMM 36-11-00-720-013.
a If the test is not OK:

Repair the sense line for leakage AMM 36-11-49-000-028 and AMM 36-11-49-400-028.

b If the test is OK:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-042 and AMM 36-11-52-400-042.

(b) For the PRV 6774G without sense line 6 installed:
1 Do a check of the blanking plug of the IPT and RPT:
a If the blanking plug is damaged, replace it.
b If the blanking plug is in the correct condition:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-042 and AMM 36-11-52-400-042.

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-042 and AMM 36-11-52-400-042.

(4) Do an Operational Test of the Bleed Air System AMM 36-11-00-710-003

Subtask 36-11-00-810-329-C ** ON A/C NOT FOR ALL

E. During the five subsequent flights check that the failure does not occur again.
(1) If the fault does not occur again, the failure has been correctly solved with the Test defined.
(2) If the fault continues:

Replace the VALVE-BLEED PRESS REG [4001HA] AMM 36-11-52-000-042 and AMM 36-11-52-400-042.

(3) If the fault continues:

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

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