Installation of the Ventilation Controller

TASK 21-28-34-400-001-A
Installation of the Ventilation Controller

ZONE: 126
FIN: 10HN ** 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
126	LATERAL AVIONIC COMPARTMENT
822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-28-00-720-003-A	Functional Test of the FWD Cargo-Compartment Ventilation-System
TASK 21-28-00-720-004-A	Functional Test of the AFT Cargo-Compartment Ventilation-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
Ventilation Controller ** ON A/C NOT FOR ALL
Ventilation Controller ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-28-34-860-050-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 21-28-34-865-051-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/AFT CARGO/VENT/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/AFT CARGO/VENT & HTG/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/FWD CARGO/VENT/CTL & MONG	2HN	C08
** ON A/C NOT FOR ALL
122VU	AIR COND/AFT CARGO VENT/FAN	30HN	S22
** ON A/C NOT FOR ALL
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22

Subtask 21-28-34-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position under the lateral avionics compartment door 822.
(2) Make sure that the access door 822 is open.

4. Procedure
Subtask 21-28-34-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Ventilation Controller

Ventilation Controller ** ON A/C NOT FOR ALL

(1) Install the ventilation controller (1).
(2) Install and tighten the nuts (2).
(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) Connect the electrical connector(s) (3).

Subtask 21-28-34-865-052-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/AFT CARGO/VENT/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/AFT CARGO/VENT & HTG/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/FWD CARGO/VENT/CTL & MONG	2HN	C08
** ON A/C NOT FOR ALL
122VU	AIR COND/AFT CARGO VENT/FAN	30HN	S22
** ON A/C NOT FOR ALL
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22

Subtask 21-28-34-720-050-A ** ON A/C NOT FOR ALL

C. Do a functional test of the FWD cargo compartment ventilation system (Ref. AMM TASK 21-28-00-720-003).

Subtask 21-28-34-720-050-B ** ON A/C NOT FOR ALL

C. Do a functional test of the AFT cargo compartment ventilation system (Ref. AMM TASK 21-28-00-720-004).

5. Close-up
Subtask 21-28-34-410-050-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 the access door 822.
(3) Remove the access platform(s).

Subtask 21-28-34-862-050-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 06:11:11 UTC