Excess Residual-Pressure Fault

TASK 21-31-00-810-845-A
Excess Residual-Pressure Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 21-31-00-810-844-A	RPCU - Fault
TSM TASK 52-73-00-810-801-A	Abnormal Flashing of the CABIN PRESSURE Warning Light Panels of the Passenger/ Crew Doors
TSM TASK 52-73-00-810-801-B	Abnormal Flashing of the CABIN PRESSURE Warning Light Panels of the Passenger/ Crew Door and Emergency Exits
AMM 21-31-00-710-002	Operational Test of the Pressure Control and Monitoring

3. Fault Confirmation
Subtask 21-31-00-710-137-A

A. Do the operational test of the pressure control and monitoring AMM 21-31-00-710-002.

4. Fault Isolation
Subtask 21-31-00-810-206-A

A. If the test gives a maintenance message:

Do the related trouble shooting procedure. Use the fault symptom(s) as entry into the TSM.

Subtask 21-31-00-810-207-A

B. If the test gives no maintenance messages:

make sure that the outflow valve is fully open and that no objects prevent the free flow of air through the outflow valve.

Subtask 21-31-00-810-208-A ** ON A/C NOT FOR ALL

C. If the outflow valve does not open automatically in the manual mode:

Subtask 21-31-00-810-220-A

D. If the fault continues:

do the trouble shooting of the PRESS SW-CABIN PRESS DET (14WN) (Ref. TSM TASK 52-73-00-810-801).

Subtask 21-31-00-720-051-A

E. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:44 UTC