Removal of the In-Seat Power Supply Unit (ISPSU)

TASK 25-21-38-000-001-A
Removal of the In-Seat Power Supply Unit (ISPSU)

ZONE: 200

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	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
In-Seat Power-Supply Unit ** ON A/C NOT FOR ALL
In-Seat Power-Supply Unit ** ON A/C NOT FOR ALL
Seat Power-Supply Unit ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 25-21-38-861-050-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 25-21-38-865-055-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
2000VU	IFE/SEAT-POWER-PAX SYS	20MK	D08
** ON A/C NOT FOR ALL
2000VU	INSEAT POWER-MCU 2	59HP	B08
2000VU	INSEAT POWER-MCU 1	58HP	B05
** ON A/C NOT FOR ALL
2000VU	SEAT POWER-MCU 2	59HP	B08
2000VU	SEAT POWER-MCU 1	58HP	B05

4. Procedure
Subtask 25-21-38-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the In-Seat Power Supply Unit (ISPSU)

In-Seat Power-Supply Unit ** ON A/C NOT FOR ALL

(1) Release the fasteners (1) and remove the cover (2).
(2) Disconnect the electrical connectors:

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(a) Release the latches (3).
(b) Disconnect the electrical connectors (4) and (7) from the ISPSU (5).
(c) Put a CAP - BLANKING on each disconnected electrical connector.
(d) Remove the nuts (8), the washers (9) and disconnect the bonding straps (10).
(3) Hold the ISPSU (5) tightly, release the fasteners (6) and remove the ISPSU (5).

Subtask 25-21-38-020-050-Q ** ON A/C NOT FOR ALL

A. Removal of the In-Seat Power-Supply Unit (ISPSU)

In-Seat Power-Supply Unit ** ON A/C NOT FOR ALL

(1) Remove the seat cushions (1).
(2) Remove the nuts (3), the washers (4), the screws (7), the washers (6) and the spacer (5).
(3) Tilt the seat pan (2) up and support it.
(4) Disconnect the electrical connectors:

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(a) Release the spring latches (10).
(b) Disconnect the electrical connectors (9) and (12) from the ISPSU (11).
(c) Put a CAP - BLANKING on the disconnected electrical connectors.
(d) Remove the nuts (13), the washers (14) and disconnect the bonding straps (15).
(5) Hold the ISPSU (11) tightly, release the fasteners (8) and remove the ISPSU (11).

Subtask 25-21-38-020-050-RY ** ON A/C NOT FOR ALL

A. Removal of the ISPSU

Seat Power-Supply Unit ** ON A/C NOT FOR ALL

(1) For the Business Class (B/C) seat:
(a) Remove the screw (1), the washer (2) and the cover (3).
(b) Release the fasteners (5) and remove the cover (4).
(2) Release the fasteners (5) and remove the cover (6) from the tourist class seat.
(3) Disconnect the electrical connectors:
(a) Release the spring latches (9).
(b) Disconnect the electrical connectors (8) and (11) from the ISPSU (10).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(d) Remove the nut (14) and the washer (13) and disconnect the bonding strap (12).
(4) Hold the ISPSU (10) tightly, release the fasteners (7) and remove the ISPSU (10).

[Rev.10 from 2021] 2026.03.31 23:30:28 UTC