Removal of the ADIRU

TASK 34-12-34-000-001-A
Removal of the ADIRU

CAUTION: DO NOT REMOVE THE RACK OF THIS UNIT. PRECISION ADJUSTMENT IS NECESSARY TO INSTALL THE RACK CORRECTLY. THE MANUFACTURER DOES THIS ADJUSTMENT BEFORE DELIVERY OF THE AIRCRAFT.

ZONE: 120
ZONE: 127
ZONE: 128
FIN: 1FP1
FIN: 1FP2
FIN: 1FP3

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	SAFETY CLIP - CIRCUIT BREAKER
FOR [1FP1] (ADIRU-1)
No specific	AR	ACCESS PLATFORM 1M(3 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
127	REAR AVIONIC COMPARTMENT
128	REAR AVIONIC COMPARTMENT
824
FOR [1FP1] (ADIRU-1)
822

C. Referenced Information

REFERENCE	DESIGNATION
Air Data/Inertial Reference Unit (ADIRU)

3. Job Set-up
Subtask 34-12-34-010-050-A

A. Get Access
(1) FOR [1FP1] (ADIRU-1)
(a) Put the ACCESS PLATFORM 1M(3 FT) in position at the access door 822.
(b) Open the access door 822.
(c) On the battery power center 105VU:

loosen the two screws and remove the protective cover.

(2) Put the access platform in position in the zone 128 at the access door 824.
(3) Open the access door 824.

Subtask 34-12-34-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 1FP1 (ADIRU1)
49VU	NAV PROBES/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
105VU	ADIRS/ADIRU1/28VDC	6FP1	C02
** ON A/C NOT FOR ALL
FOR FIN: 1FP2 (ADIRU2)
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** ON A/C ALL
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
121VU	ADIRS/ADIRU/2/28VDC	6FP2	N04
** ON A/C NOT FOR ALL
121VU	ADIRS/2PWR/SHED &/AOA2 MON	10FP	N10
** ON A/C NOT FOR ALL
FOR FIN: 1FP3 (ADIRU3)
49VU	NAV PROBES/ADIRU3/PWR/SWTG	8FP	F09
** ON A/C NOT FOR ALL
49VU	NAV PROBES/ADIRU3/PWR/SWTG	8FP	F08
** ON A/C ALL
121VU	ADIRS/ADIRU/3PWR/SWTG	9FP	N09
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07
121VU	ADIRS/ADIRU/3/115VAC	4FP3	N05
121VU	ADIRS/ADIRU/3/28VDC	6FP3	N03

4. Procedure
Subtask 34-12-34-020-050-A

A. Removal of the ADIRU (1FP1, 1FP2, 1FP3)

NOTE: The procedure is the same for the three ADIRUs 1FP1, 1FP2 and 1FP3.

(1) Loosen the nuts (4).
(2) Lower the nuts (4).
(3) Pull the ADIRU (6) on its rack (3) to disconnected the electrical connectors (1).
(4) Remove the ADIRU (6) from its rack (3).
(5) Put blanking caps on the disconnected electrical connectors (1).

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