Installation of the FWD Cargo Compartment Extraction Fan

TASK 21-28-53-400-001-A
Installation of the FWD Cargo Compartment Extraction Fan

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

ZONE: 132
FIN: 6HN ** 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 3M (10 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
132	FORWARD CARGO COMPARTMENT
132KW, 825

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-28-00-710-004-A	Operational Test of the FWD Cargo-Compartment Outlet Isolation-Valve in the Ditching Configuration
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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 25-54-12-000-003-A	Removal of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-54-12-400-003-A	Installation of the Sidewall Panels in the Forward Cargo Compartment
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Extraction Fan

3. Job Set-up
Subtask 21-28-53-860-050-A ** ON A/C NOT FOR ALL

A. Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).

Subtask 21-28-53-941-052-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) In the cockpit, on the overhead panel, on the AIR COND section of panel 30VU:
(a) Make sure that:
1 The APU BLEED pushbutton switch is in the off position (the ON legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
3 The PACK 1 and PACK 2 pushbutton switches are released (the OFF legends are on).
(b) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate these pushbutton switches.
(2) On the HP and the LP ground connectors:
(a) Make sure that the WARNING NOTICE(S) is in position to tell persons not to supply the ground air.

Subtask 21-28-53-865-054-A ** ON A/C NOT FOR ALL

C. 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
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22

Subtask 21-28-53-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at forward cargo-compartment door 825.
(2) Make sure that forward cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that sidewall panel 132KW is removed (Ref. AMM TASK 25-54-12-000-003).

Subtask 21-28-53-210-050-A ** ON A/C NOT FOR ALL

E. Make sure that the clamps, the flexible sleeve and the fan are in the correct condition. Replace them if necessary.

4. Procedure
Subtask 21-28-53-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Extraction Fan
(1) Clean the component interfaces and the adjacent area.
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Install the flexible sleeve (6) on the valve (8).
(4) Install the fan (3) in the flexible sleeve (6).

NOTE: The arrow which shows the airflow direction points rearward.

(5) Install the clamp (4). Do not fully tighten at this time.
(6) Make sure that the fan (3) is in the correct angular position.

Extraction Fan ** ON A/C NOT FOR ALL

The electrical cable must not be too tight or too loose.
(7) Install the clamp (2) and torque to the value given on the clamp.
(8) Put the flexible sleeve (6) in position.
(9) Install the clamps (5) and (7) and tighten them.
(10) Tighten the clamp (4).
(11) Remove the CAP-BLANKING from each electrical connector and receptacle.
(12) Make sure that all the electrical connections are clean and in the correct condition.
(13) Connect the electrical connector (10).
(14) Connect the bonding strip (9).

Subtask 21-28-53-865-055-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
122VU	FWD CARGO VENT AND HTG/FAN	1HN	T22

Subtask 21-28-53-710-050-A ** ON A/C NOT FOR ALL

C. Do an operational test of the FWD cargo compartment ventilation (Ref. AMM TASK 21-28-00-710-004).

5. Close-up
Subtask 21-28-53-410-050-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) Install sidewall panel 132KW (Ref. AMM TASK 25-54-12-400-003).
(3) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 21-28-53-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:11:12 UTC