Failure of the Annunciator-Light Test and Interface-Board

TASK 33-14-00-810-805-A
Failure of the Annunciator-Light Test and Interface-Board

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 215101
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
AMM 33-14-33-000-001	Removal of the Annunciator-Light Test and Interface-Board
AMM 33-14-33-400-001	Installation of the Annunciator-Light Test and Interface-Board

3. Fault Confirmation
Subtask 33-14-00-710-058-A ** ON A/C NOT FOR ALL

A. Do the operational test of the cockpit and cabin temperature control with CFDS/MCDU AMM 21-63-00-710-004.

4. Fault Isolation
Subtask 33-14-00-810-060-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message P2 FAULT RELAY (20LP):

replace the BOARD-ANN LT TEST & INTFC [20LP] AMM 33-14-33-000-001 and AMM 33-14-33-400-001.

(1) If the fault continues:

do a check and repair the wiring between pin AB/8B of the air-conditioning system controller 2 (57HH) and pin A/2 of the annunciator-light test and interface-board (20LP) ASM 215101.

Subtask 33-14-00-710-059-A ** ON A/C NOT FOR ALL

B. Do the operational test of the cockpit and cabin temperature control with CFDS/MCDU AMM 21-63-00-710-004.

[Rev.8 from Aug 2018] 2026.04.04 04:31:54 UTC