Removal of the AFT Cargo Heat Controller

TASK 21-43-34-000-002-A
Removal of the AFT Cargo Heat Controller

ZONE: 121
FIN: 10HC ** 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 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
AFT Cargo Heat Controller ** ON A/C NOT FOR ALL
AFT Cargo Heat Controller ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-43-34-861-051-A ** ON A/C NOT FOR ALL

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

Subtask 21-43-34-865-053-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	AIR COND/AFT CARGO/VENT/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/AFT CARGO/VENT & HTG/CTL & MONG	31HN	C07

Subtask 21-43-34-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 811.
(2) Open access door 811 (Ref. AMM TASK 52-41-00-010-002)

4. Procedure
Subtask 21-43-34-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the AFT Cargo Heat Controller
(1) Loosen the nut (9).
(2) Lower the nut (9).
(3) Pull the AFT cargo heat controller (6) on its rack (8) to disconnect the electrical connectors (7).
(4) Remove the AFT cargo heat controller (6) from the rack (8).
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

[Rev.10 from 2021] 2026.04.02 06:11:20 UTC