Adjustment of the Fan Cowl Latches [IAE]

TASK 71-13-00-800-012-A
Adjustment of the Fan Cowl Latches

WARNING: BE CAREFUL IF YOU OPEN THE FAN COWL(S) WHEN THE WIND SPEED IS 30MPH (48KM/H) OR MORE. INJURY AND/OR DAMAGE TO THE ENGINE CAN OCCUR IF THE WIND MOVES THE FAN COWL(S).

WARNING: DO NOT OPEN THE FAN COWL(S) WHEN THE WIND SPEED IS 60 MPH (96 KM/H) OR MORE. INJURY AND/OR DAMAGE TO THE ENGINE CAN OCCUR IF THE WIND MOVES THE FAN COWL(S).

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )

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 70-23-11-911-013-A	General Torque Tightening Techniques
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)
TASK 71-13-00-800-010-A	Functional Check of Fan Cowl Latch Tension
In-to and Out-of Wind Step Limits
Latch Keeper Adjustment

3. Job Set-up
Subtask 71-13-00-941-058-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).

4. Procedure
Subtask 71-13-00-220-052-A ** ON A/C NOT FOR ALL

A. Make a check of the in-to or out-of wing step of the latch handles.

In-to and Out-of Wind Step Limits ** ON A/C NOT FOR ALL

(1) At each latch position, measure the distance between the outer edge of the latch handle and the cowl door - Dimension W
(a) If the latch handle is more than 0.040 in. (1.02 mm) out from the surface of the cowl door, adjust the latch.
(b) If the latch handle is more than 0.050 in. (1.27 mm) in from the surface of the cowl door, adjust the latch.
(c) If the position of the latch handle is between the limits given in this procedure, adjustment is not necessary.

Subtask 71-13-00-010-060-A ** ON A/C NOT FOR ALL

B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010).
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 71-13-00-820-062-A ** ON A/C NOT FOR ALL

C. Adjust the latches.

Latch Keeper Adjustment ** ON A/C NOT FOR ALL

(1) Loosen the nuts (24) which attach the latch keeper (22) to the keeper housing (23).
(2) Move the latch keeper (22) to set the latch handle in the correct position.
(a) Move the latch keeper (22) away from the outer surface of the door to decrease an in-to wind step.
(b) Move the latch keeper (22) nearer to the outer surface of the door to decrease an out-of wing step.
(3) TORQUE the nuts (24) to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 71-13-00-410-061-A ** ON A/C NOT FOR ALL

D. Close the fan cowls (Ref. AMM TASK 71-13-00-410-010)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 71-13-00-220-053-A ** ON A/C NOT FOR ALL

E. Make a check of the in-to or out-of wind step of the latch handles

In-to and Out-of Wind Step Limits ** ON A/C NOT FOR ALL

(1) At each latch position, measure the distance between the outer edge of the latch handle and the cowl door - Dimension W
(a) If the latch handle is more than 0.040 in. (1.02 mm) out from the surface of the cowl door, do the adjustment procedure again.
(b) If the latch handle is more than 0.050 in. (1.27 mm) in from the surface of the cowl door, do the adjustment procedure again.

Subtask 71-13-00-820-063-A ** ON A/C NOT FOR ALL

F. Make a check of the alignment spigots and the force necessary to close the latches (Ref. AMM TASK 71-13-00-800-010).

Subtask 71-13-00-410-062-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 02:29:15 UTC