Removal of the Ram-Air Outlet

TASK 21-61-52-000-003-A
Removal of the Ram-Air Outlet

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.

NOTE: The procedure is the same for the left ram-air outlet and the right ram-air outlet.

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	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191KB, 192KB, 195AB, 196AB

C. Referenced Information

REFERENCE	DESIGNATION
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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
Ram Air Outlet

3. Job Set-up
Subtask 21-61-52-861-051-A

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 21-61-52-865-060-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 9HH
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
** ON A/C NOT FOR ALL
FOR FIN: 29HH
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

Subtask 21-61-52-010-054-A

C. Get Access
(1) Remove the access panel/s (Ref. AMM TASK 53-35-13-000-002).
(a) For the left ram-air outlet,

191KB and 195AB.

(b) For the right ram-air outlet,

192KB and 196AB.

Subtask 21-61-52-941-050-A

D. Safety Precautions
(1) On the panel 30VU:
(a) Make sure that the APU BLEED and the ENG BLEED/1(2) pushbutton switches are released.
(b) Put a warning notice to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice to tell persons not to supply the ground air.

4. Procedure
Subtask 21-61-52-020-052-B

A. Removal of the Ram-Air Outlet

Ram Air Outlet

(1) Remove the clamp (2) and disconnect the sleeve (1).
(2) Remove the screws (6) and the washers (7).
(3) Hold the ram-air outlet (5) and:
(a) For the left ram-air outlet,
1 Remove the bolts (12), (13), (15), (16) and (18) and the washers (4).

NOTE: Identify the bolts for use in the installation procedure.

(b) For the right ram-air outlet,
1 Remove the bolts (12), (14), (15), (17) and (18) and the washers (4).

NOTE: Identify the bolts for use in the installation procedure.

(4) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the ram-air outlet (5).

[Rev.10 from 2021] 2026.04.02 06:11:41 UTC