DFDR Playback Data Fault

TASK 31-33-00-810-806-A
DFDR Playback Data Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-33-00-710-001	Operational Test of the Power Interlocks and Status Monitoring
ASM 313301
AMM 31-33-34-000-001	Removal of the Flight Data Interface Unit (FDIU)
AMM 31-33-34-400-001	Installation of the Flight Data Interface Unit (FDIU)
AMM 31-33-55-000-001	Removal of the Digital Flight Data Recorder (DFDR)
AMM 31-33-55-400-002	Installation of the Digital Flight Data Recorder (DFDR)
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)

3. Fault Confirmation
Subtask 31-33-00-710-055-A

A. Do the Operational Test of the Power Interlocks and Status Monitoring AMM 31-33-00-710-001.

4. Fault Isolation
Subtask 31-33-00-810-055-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DFDR PLAYBACK:

(1) If the fault continues:

(2) If the fault continues:

Subtask 31-33-00-810-055-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DFDR PLAYBACK:

on the 21VU make sure that the RCDR GND CTL switch is on (blue light indicator is on).

(1) If the fault continues:

(2) If the fault continues:

(3) If the fault continues:

Subtask 31-33-00-710-062-A

B. Do the test given in paragraph 3.A. again to check the correct operation
(no maintenance message display).

[Rev.8 from Aug 2018] 2026.04.04 04:30:00 UTC