Low Air Pressure in the Right Crossbleed Duct

TASK 36-12-00-810-804-A
Low Air Pressure in the Right Crossbleed Duct

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection
AMM 36-12-52-000-001	Removal of the Crossbleed Valve
AMM 36-12-52-400-001	Installation of the Crossbleed Valve

3. Fault Confirmation
Subtask 36-12-00-710-056-A ** ON A/C NOT FOR ALL

A. Do the pre-conditioning with the high-pressure ground connection AMM 12-33-21-618-001 or with the APU AMM 12-33-21-618-001.

NOTE: Make sure that there are no maintenance messages related to the pack 2 and/or the crossbleed system available before you do this test.

4. Fault Isolation
Subtask 36-12-00-810-057-A ** ON A/C NOT FOR ALL

A. If the right pack does not operate during the pre-conditioning because of low pressure:

Subtask 36-12-00-710-057-A ** ON A/C NOT FOR ALL

B. Do the test as given in Para. 3. to make sure that the operation is correct (no maintenance message shown).

[Rev.8 from Aug 2018] 2026.04.04 04:34:00 UTC