Removal of the ADIRS CDU

TASK 34-12-12-000-001-A
Removal of the ADIRS CDU

ZONE: 211
FIN: 2FP ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
211	COCKPIT
822

C. Referenced Information

REFERENCE	DESIGNATION
ADIRS - Control and Display Unit (CDU)

3. Job Set-up
Subtask 34-12-12-010-050-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at the access door 822.
(2) Open the access door 822.
(3) On the battery power center 105 VU:

loosen the two screws and remove the protective cover.

Subtask 34-12-12-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
105VU	ADIRS/ADIRU1/28VDC	6FP1	C02
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
121VU	ADIRS/ADIRU/2/28VDC	6FP2	N04
121VU	ADIRS/ADIRU/3/28VDC	6FP3	N03
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06
122VU	LIGHTING/ANN LT SPLY/XFMR/BUS 2	27LP	X05
122VU	LIGHTING/ANN LT SPLY/XFMR/BUS 1	26LP	X04
122VU	LIGHTING/INSTL LT/OVHD/PNL	3LF	Y03

4. Procedure
Subtask 34-12-12-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the ADIRS CDU (2FP)
(1) Hold the CDU (4) and loosen the four quarter turn fasteners (5).
(2) Disengage the CDU (4) from its housing (1).
(3) Disconnect the three electrical connectors (2).
(4) Remove the CDU (4).
(5) Put CAP - BLANKING on the disconnected electrical connectors (2) and (3).

[Rev.10 from 2021] 2026.04.02 06:23:05 UTC