MCDU - NO TEST Indications

TASK 21-61-00-810-888-A
MCDU - NO TEST Indications

1. Possible Causes

2. Fault Confirmation
Subtask 21-61-00-710-182-A ** ON A/C NOT FOR ALL

A. Unable to complete temperature control test (MCDU).

3. Fault Isolation
Subtask 21-61-00-810-230-A ** ON A/C NOT FOR ALL

A. If the temperature control test shows the MCDU indications NO TEST: PACK 1 NOT OFF and PACK 2 NOT OFF:
(1) Where applicable disconnect or shut down the Engine, APU and/or HP bleed air supplies.

NOTE: Presence of bleed air pressure could lead to test performance failure.

(2) Open the circuit breakers 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH and 56HH.
(3) Wait for a minimum of 5 seconds.
(4) Close the circuit breakers 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH and 56HH.
(5) With the bleed air supply still disconnected or shut down restart the related temperature control test.

[Rev.8 from Aug 2018] 2026.04.04 04:24:58 UTC