Removal of the Emergency Ram Air Inlet and Air Inlet Ducts

TASK 21-55-52-000-801-A
Removal of the Emergency Ram Air Inlet and Air Inlet Ducts

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 1M (3 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191AB, 191BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-55-51-000-001-A	Removal of the Emergency Ram Air Inlet Actuator
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
Emergency Ram-Air Inlet and Air Inlet Ducts

3. Job Set-up
Subtask 21-55-52-861-050-A

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 21-55-52-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/RAM/AIR/INLET	1HZ	D10

Subtask 21-55-52-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at the access panel 191AB.
(2) Remove the access panel 191AB and 191BB.

4. Procedure
Subtask 21-55-52-020-050-A

A. Removal of the Emergency Ram Air Inlet
(1) Remove the Emergency Ram Air Inlet Actuator (Ref. AMM TASK 21-55-51-000-001).
(2) Remove the screw (3) and the nut (1).
(3) Remove the bonding strap (2).
(4) Remove the screws (7) and (8) and the washers (6).
(5) Remove the inlet panels (9) and (5).
(6) Remove the washer shims (4).
(7) Remove and discard the cotter-pins (10).
(8) Remove the bolts (13), the nuts (11), the washers (12) and the washers (14).
(9) Remove the emergency ram air inlet (15).

Subtask 21-55-52-020-051-A

B. Removal of the Air Inlet Ducts

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(1) Remove and discard the cotter pins (24).
(2) Remove the pin (26) and the washers (27).
(3) Hold the link (25) and remove the pin (23) and the washers (27).
(4) Loosen the bolts (22) and the nuts (20) from the upper air-inlet duct (21) and the lower air-inlet duct (28).
(5) Do not remove the bolts (22) and the nuts (20) from the bracket supports (19) at this time.
(6) Remove the bolts (30) and the nuts (20) from the upper air-inlet duct (21), the shutter (29) and the lower air-inlet duct (28).
(7) Remove the lower air-inlet duct (28) and the shutter (29) from the upper air-inlet duct (21).
(8) Remove the nuts (20) and the bolts (22) from the bracket supports (19).
(9) Remove the upper air-inlet duct (21) from the bracket supports (19).
(10) Remove the bolts (18) and the washers (17).
(11) Remove the gasket (16).
(12) Remove the collar (31) from the upper air-inlet duct (21).
(13) Remove the adhesive from the area between the collar (31) and the upper air-inlet duct (21) with a SCRAPER - NON METALLIC.

[Rev.10 from 2021] 2026.04.02 06:11:33 UTC