Installation of the Air Outlet Heater

TASK 21-41-51-400-001-A
Installation of the Air Outlet Heater

WARNING: MAKE SURE THAT THE FWD AVIONICS ACCESS DOOR 811 IS OPEN WITH A WARNING PLACARD ATTACHED TO IT. THE WARNING NOTICE MUST TELL PERSONS NOT TO CLOSE THE DOOR. THIS PREVENTS ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT.

FIN: 3HE ** ON A/C NOT FOR ALL
FIN: 4HE ** 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	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811
FOR [3HE] (HEATER-AIR OUTLET, L)
211AW, 211BZ
FOR [4HE] (HEATER-AIR OUTLET, R)
212AW, 212BZ

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-41-00-720-001-A	Functional Test of the Foot Air-Outlet Heater
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 25-13-41-000-002-A	Removal of the Sidewall Panels
TASK 25-13-41-400-002-A	Installation of the Sidewall Panels
Air Outlet Heater (3HE, 4HE)

3. Job Set-up
Subtask 21-41-51-860-050-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).
(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the access door 811.
(3) Make sure that the access door 811 is open.
(4) Make sure that the sidewall panels are removed as necessary (Ref. AMM TASK 25-13-41-000-002):
(a) FOR [3HE] (HEATER-AIR OUTLET, L)
211BZ 211AW
(b) FOR [4HE] (HEATER-AIR OUTLET, R)
212BZ 212AW
(5) On the AIR COND panel 30VU:
(a) Make sure that:

The APU BLEED pushbutton switch is released
The ENG 1 BLEED and ENG 2 BLEED pushbutton switches are released
The PACK 1 and PACK 2 pushbutton switches are released.

(b) Make sure that the WARNING NOTICE(S) to tell persons not to operate these pushbutton switches, is in position.
(6) On the HP and LP ground connectors:

Make sure that the WARNING NOTICE(S) to tell persons not to supply the ground source, is in position.

Subtask 21-41-51-865-054-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
122VU	CKPT/FOOT/HEATERS	1HE	V23

4. Procedure
Subtask 21-41-51-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Air Outlet Heater
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put the air outlet heater (2) in position.
(4) Put the clamp (3) in position.
(5) Install the four screws (7), washers (8) and nuts (9) and tighten.
(6) Install the duct (5) on the air outlet heater (2) and put the clamp (4) in position.
(7) Tighten the clamps (3) and (4).
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (6).

Subtask 21-41-51-865-055-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
122VU	CKPT/FOOT/HEATERS	1HE	V23

Subtask 21-41-51-710-050-A ** ON A/C NOT FOR ALL

C. Do a functional test of the foot air-outlet heater (Ref. AMM TASK 21-41-00-720-001).

5. Close-up
Subtask 21-41-51-410-050-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 the sidewall panels as necessary (Ref. AMM TASK 25-13-41-400-002):
(a) FOR [3HE] (HEATER-AIR OUTLET, L)
211BZ 211AW
(b) FOR [4HE] (HEATER-AIR OUTLET, R)
212BZ 212AW
(3) Close the access door 811.
(4) Remove the access platform(s).
(5) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

Subtask 21-41-51-942-050-A ** ON A/C NOT FOR ALL

B. Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:11:17 UTC