Failure of the MMR1 without Cockpit Effect

TASK 34-36-00-810-868-A
Failure of the MMR1 without Cockpit Effect

1. Possible Causes

MMR-1 [40RT1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-36-00-740-003	BITE Test of the MMR
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver

3. Fault Confirmation
Subtask 34-36-00-740-152-A ** ON A/C NOT FOR ALL

A. Test
Do the BITE test of the MMR1 AMM 34-36-00-740-003.

4. Fault Isolation
Subtask 34-36-00-810-137-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message MMR1(40RT1):

on the MCDU, push the line key adjacent to the maintenance message class number to get access to the trouble shooting data and read the related fault code.
make a record of the fault code.

NOTE: Use only the second and third digits of the fault code(s).

(1) If the trouble shooting data give one of the fault codes that follow:
XA0X, XA1X, XA2X, XA3X, XA4X, XA5X, XA6X, XA7X, XA8X, XA9X, XAAX, XABX, XACX, XADX, XAEX, XAFX, XB0X, XB1X, XB2X, XB3X, XB4X or X8BX

no maintenance action is necessary.

(2) If the trouble shooting data do not give one of these fault codes:

replace the MMR-1 [40RT1] AMM 34-36-31-000-001 and AMM 34-36-31-400-001.

Subtask 34-36-00-740-153-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:02 UTC