Outflow Valve does not operate in the Manual Mode

TASK 21-31-00-810-824-A
Outflow Valve does not operate in the Manual Mode

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-31-00-710-003	Operational Test of Manual Mode Selection and Manual Mode Pressure Control and Functional Test of Manual Mode Cabin Altitude/Outflow Valve Position Indication
ASM 213101
AMM 21-31-51-000-001	Removal of the Outflow Valve (From Inside)
AMM 21-31-51-000-004	Removal of the Outflow Valve - Manual Motor 10HL-5
AMM 21-31-51-000-006	Removal of the Outflow Valve (From Outside)
AMM 21-31-51-400-001	Installation of the Outflow Valve (From Inside)
AMM 21-31-51-400-004	Installation of the Outflow Valve - Manual Motor 10HL-5
AMM 21-31-51-400-006	Installation of the Outflow Valve (From Outside)

3. Fault Confirmation
Subtask 21-31-00-710-096-A

A. Do the operational test of the manual pressure control and monitoring AMM 21-31-00-710-003.

4. Fault Isolation
Subtask 21-31-00-810-127-A

A. If the outflow valve does not operate during the manual mode:

do a check for 28VDC at the outflow valve (10HL) between the pin C/A and C/B with the MAN V/S CTL switch (5HL) in the full UP and in the full DN position.

(1) If the voltage is correct:

(a) If the fault continues:

(2) If the voltage is not correct:

(a) If the voltage is correct:

1 If the fault continues:

2 If the fault continues:

do a check and repair the wiring between:
.the circuit breaker (3HL) and the OUTFLOW VALVE (10HL) C/A,B via the MODE SEL pushbutton switch (14HL) and the MAN V/S CTL switch (5HL),
.the OUTFLOW VALVE (10HL) C/B to the GND via the MAN V/S CTL switch (5HL),

ASM 213101.
(b) If the voltage is not correct:

Subtask 21-31-00-710-097-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:43 UTC