Removal of the DEU A/DEU B - Mount

TASK 23-73-48-000-001-A
Removal of the DEU A/DEU B - Mount

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	CAP - BLANKING
No specific	AR	STEPLADDER 0.5 M (1.6 FT)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 23-73-46-000-001-A	Removal of the Decoder/Encoder Unit A
TASK 23-73-47-000-001-A	Removal of the Decoder/Encoder Unit B
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 25-23-42-000-001-A	Removal of the Ceiling Panels - Forward Utility Area
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-48-000-001-A	Removal of the Cove Light Panel
Mount DEU A / DEU B ** ON A/C NOT FOR ALL
Mount DEU A / DEU B ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-73-48-861-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 23-73-48-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM DIR ESS/2	157RH	G02
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M07
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M06
121VU	COM/CIDS/DEU B/BAT	143RH	N12
121VU	COM/CIDS/DEU A BAT/LINE 1	144RH	N13
121VU	COM/CIDS/DEU A BAT/LINE 2	145RH	N14
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DEU B/ESS	153RH	G03
49VU	COM/CIDS/DEU A ESS/LINE 1	154RH	G04
49VU	COM/CIDS/DEU A ESS/LINE 2	155RH	G05
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M09
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU B/NORM	162RH	M08
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/L FWD	163RH	M10
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/L FWD	163RH	M09
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R FWD	164RH	M11
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R FWD	164RH	M10
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/L MID	165RH	M12
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/L MID	165RH	M11
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R MID	166RH	M13
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R MID	166RH	M12
121VU	COM NAV/CIDS/DEU A NORM/L AFT	167RH	M13
121VU	COM NAV/CIDS/DEU A NORM/R AFT	168RH	M14
** ON A/C NOT FOR ALL
2001VU	CIDS/ DEU A NORM AFT LH	173RH	C07
2001VU	CIDS/ DEU A NORM AFT RH	174RH	C08
2001VU	CIDS/ DEU A NORM MID 2 LH	175RH	C05
2001VU	CIDS/ DEU A NORM MID 2 RH	176RH	C06

Subtask 23-73-48-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put a STEPLADDER 0.5 M (1.6 FT) below the related access panel.
(2) Remove the related cove light panel (Ref. AMM TASK 25-23-48-000-001), or the forward utility-area ceiling panel (Ref. AMM TASK 25-23-42-000-001), or the aft utility-area ceiling panel (Ref. AMM TASK 25-23-42-000-002).

4. Procedure
Subtask 23-73-48-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the DEU A/DEU B -Mount
(1) Disconnect the electrical connector (2) from the DEU mount (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the related DEU A (Ref. AMM TASK 23-73-46-000-001) or DEU B (Ref. AMM TASK 23-73-47-000-001).
(4) Remove the screws (3) and washers (4).
(5) Remove the DEU mount (1).

[Rev.10 from 2021] 2026.04.02 06:12:36 UTC