Interface Inspection of the Air Intake Cowl [IAE]

TASK 71-11-11-200-010-B
Interface Inspection of the Air Intake Cowl

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
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-11-11-000-010-B	Removal of the Air Intake Cowl
TASK 71-11-11-400-010-B	Installation of the Air Intake Cowl
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Air Intake Cowl Interface

3. Job Set-up
Subtask 71-11-11-941-060-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 71-11-11-010-057-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-11-11-010-058-A ** ON A/C NOT FOR ALL

C. Remove the air intake cowl (Ref. AMM TASK 71-11-11-000-010).

4. Procedure
Subtask 71-11-11-210-063-A ** ON A/C NOT FOR ALL

A. Examine the attach ring
(1) Visually examine the attach ring (1)
(a) Examine the mating surface for scores, gouges, nicks and scratches
1 Up to a maximum depth of 0.010 in. (0.25 mm), accept the damage.
2 More than 0.010 in. (0.25 mm) in depth, reject the cowl.
(b) Examine the mating surface for burrs
1 If there are burrs on the mating surface, reject the cowl.
(c) Examine the captive nuts
1 If the captive nuts are not there or have threads which are crossed, stripped or burred, reject the cowl.
2 If the rivets which hold the captive nuts show signs of distortion or are not there, reject the cowl.
(d) Examine the attach ring for distortion
1 If the attach ring shows signs of distortion, reject the cowl.
(e) Examine the four location spigots.
1 If the location spigots are bent, loose, burred or not there, reject the cowl.

Subtask 71-11-11-210-064-A ** ON A/C NOT FOR ALL

B. Examine the air intake anti-ice ducts
(1) Visually examine the air intake anti-ice ducts (2).
(a) If the insulation is broken or not there, reject the cowl.
(b) Examine the mating surface of the flange for scores, gouges, nicks and scratches
1 Circumferential damage up to a maximum depth of 0.010 in. (0.25 mm), accept the damage.
2 Damage which is more than 0.010 in. (0.25 mm) in depth or which is not circumferential, reject the cowl.
(c) Examine the mating surface of the flange for burrs
1 If there are burrs on the mating surface, reject the cowl.

5. Close-up
Subtask 71-11-11-410-055-A ** ON A/C NOT FOR ALL

A. Install the air intake cowl (Ref. AMM TASK 71-11-11-400-010).

Subtask 71-11-11-410-056-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:28:52 UTC