FDIMU Inoperative

TASK 31-36-00-810-898-A
FDIMU Inoperative

1. Possible Causes

DMU/FDIU (FDIMU) [10TV]
SDAC-1 [1WV1]
SDAC-2 [1WV2]
AMU [1RN]
wiring
CFDIU [1TW]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-33-00-810-801-A	DFDR Inoperative
TSM TASK 31-33-00-810-805-A	Accelerometer Fault
TSM TASK 31-33-00-810-806-A	DFDR Playback Data Fault
TSM TASK 31-33-00-810-807-A	No AC Ident
TSM TASK 31-36-00-810-899-A	FDIMU Battery
TSM TASK 31-36-00-810-900-A	FDIMU PCMCIA MEDIA
AMM 23-51-34-400-001	Installation of the Audio Management Unit (AMU) (1RN)
AMM 31-36-00-740-008	Access to the Parameter Call-Up Menus
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)
ASM 313601
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)
ASM 313701
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-36-00-740-164-A ** ON A/C NOT FOR ALL

A. Do the test of the FDIMU (10TV) AMM 31-36-00-740-012.

4. Fault Isolation
Subtask 31-36-00-810-110-C ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message as listed below do the related trouble shooting procedure:

"DFDR" (Ref. TSM TASK 31-33-00-810-801)
"ACCELEROMETER" (Ref. TSM TASK 31-33-00-810-805)
"DFDR PLAYBACK" (Ref. TSM TASK 31-33-00-810-806)
"NO AC IDENT" (Ref. TSM TASK 31-33-00-810-807)
"PCMCIA MEDIA" (Ref. TSM TASK 31-36-00-810-900)
"BATTERY" (Ref. TSM TASK 31-36-00-810-899)

(1) If the test gives a message related to a FDIMU internal failure replace the DMU/FDIU (FDIMU) [10TV] AMM 31-36-34-000-002 and AMM 31-36-34-400-002.
(2) If the fault continues:

replace SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001
if fault continues, replace SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001
if fault continues, replace AMU [1RN] AMM 31-55-34-000-001 and AMM 23-51-34-400-001.

(3) If the test gives a message "NO RESPONSE" (FDIU part and DMU part):

make sure that the CB 5TV is closed
do a check for 115 VAC at the FDIMU (10TV) connectors AC/1 and AC/7 ASM 313601.

(a) If there is 115 VAC:

replace the DMU/FDIU (FDIMU) [10TV] AMM 31-36-34-000-002 and AMM 31-36-34-400-002.

(b) If the fault continues:

do a check and repair the wiring between the DMU/FDIU (FDIMU) [10TV] and SDAC-1 [1WV1] , SDAC-2 [1WV2] , AMU [1RN] and CFDIU [1TW] ASM 313601 and ASM 313701:

1 FDIMU (10TV) connector AA/15C and SDAC1 (1WV1) pin AA/10K and SDAC2 (1WV2) pin AA10K
2 FDIMU (10TV) connector AA/12C and AMU (1RN) pin AB/2J
3 FDIMU (10TV) connector AA/12D and AMU (1RN) pin AB/2K
4 FDIMU (10TV) connector AB/4C and CFDIU (1TW) connector AB/11D
5 FDIMU (10TV) connector AB/4D and CFDIU (1TW) connector AB/11E
6 FDIMU (10TV) connector AA/12E and CFDIU (1TW) connector AB/8B
7 FDIMU (10TV) connector AA/12F and CFDIU (1TW) connector AB/8C.
(c) If there is no 115 VAC:

do a check and repair the wiring between the DMU/FDIU (FDIMU) [10TV] and CB 5TV and Ground points ASM 313601:

1 from FDIMU AC/1 to CB 5TV/2
2 from FDIMU AC/7 to ground
3 from FDIMU AA/15J to ground
4 from FDIMU AA/15K to ground
5 from FDIMU AB/15J to ground
6 from FDIMU AB/15K to ground.
(4) If the ECAM shows the message "31-00 DAR" and a DAR is not installed:

make sure that the PCMCIA configuration of the FDIMU database is correct.

NOTE: A DAR fault message also can occur on the ECAM, if the PCMCIA configuration of the FDIMU database is customized. For example the FDIMU generates a DAR fault message, if a PCMCIA card is not installed or the PCMCIA DAR space is full and the CFDS failure inhibition is not set. For details refer to the vendor documentation of the FDIMU.

do a check of the alpha call-up "DISI1" AMM 31-36-00-740-008.

(a) If the bits 1 and 3 of the alpha call-up "DISI1" are "1":

check if pin AA/13E of the FDIMU is grounded ASM 313601.

1 If the pin AA/13E is grounded:

repair the wiring and remove the ground from pin AA/13E.

2 If the pin AA/13E is not grounded:

replace the FDIMU AMM 31-36-34-000-002, AMM 31-36-34-400-002.

Subtask 31-36-00-740-165-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:05 UTC