Installation of the FWD Cargo Heat Controller

TASK 21-43-34-400-001-A
Installation of the FWD Cargo Heat Controller

ZONE: 121
FIN: 1HC ** 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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-43-00-710-002-A	Operational Test of the FWD Cargo Compartment Heating System
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
FWD Cargo Heat Controller

3. Job Set-up
Subtask 21-43-34-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).

Subtask 21-43-34-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/FWD CARGO/VENT/CTL & MONG	2HN	C08

Subtask 21-43-34-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 811.
(2) Make sure that the access door 811 is open (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 21-43-34-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the FWD Cargo Heat Controller
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Install the FWD cargo heat controller (1) on its rack (3).
(6) Push the FWD cargo heat controller (1) on its rack (3) to connect the electrical connector (2).
(7) Engage the nut (4) on the lug (5) and tighten.

Subtask 21-43-34-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/FWD CARGO/VENT/CTL & MONG	2HN	C08

Subtask 21-43-34-710-050-A ** ON A/C NOT FOR ALL

C. Do an operational test of the FWD cargo compartment heating system (Ref. AMM TASK 21-43-00-710-002).

5. Close-up
Subtask 21-43-34-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 811 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 21-43-34-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

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