General Visual Inspection of Fan Cowl Latches and Adjacent Structure [CFMB]

TASK 71-13-13-220-802-B
General Visual Inspection of Fan Cowl Latches and Adjacent Structure

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400

1. Reason for the Job
Refer to the MPD TASK: 711000-C6
GENERAL VISUAL INSPECTION OF FAN COWL LATCHES AND ADJACENT STRUCTURE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-13-11-000-041-A	Removal of the Fan Cowl Doors
TASK 71-13-11-400-041-A	Installation of the Fan Cowl Doors
TASK 71-13-13-000-041-A	Removal of the Fan Cowl Door Latches and Keepers
TASK 71-13-13-220-041-B	Detailed Inspection of the Keeper Assy Fan Cowl Locking Device
TASK 71-13-13-400-041-A	Installation of the Fan Cowl Door Latches and Keepers
SRM 542000
CMM 711327
CMM 711328
Fan Cowl Latches and Adjacent Structure - LH Cowls
Fan Cowl Latches and Adjacent Structure - RH Cowls

3. Job Set-up
Subtask 71-13-13-941-058-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) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is OFF.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).

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

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 71-13-13-220-060-A ** ON A/C NOT FOR ALL

A. Do a Visual Inspection of the Fan Cowl Latches as follows:
(1) Visual inspection of the left fan cowl latches.
(a) Examine the fan cowl latches for damage and distortion. If damage is found, replace the damaged part (Ref. AMM TASK 71-13-13-000-041) and (Ref. AMM TASK 71-13-13-400-041).
(b) Visually inspect the fan cowl latches for cracks. If cracks are found, replace the latch (Ref. AMM TASK 71-13-13-000-041) and (Ref. AMM TASK 71-13-13-400-041).
(c) Examine the fan cowl latches for nicks, scratches, gouges, or excessive wear. If damage or wear is more than 0.01 in. (0.25 mm) in depth, replace the latch (Ref. AMM TASK 71-13-13-000-041) and (Ref. AMM TASK 71-13-13-400-041).
(d) Examine the fan cowl latches for a weak spring. If a weak spring is found, replace the latch (Ref. AMM TASK 71-13-13-000-041) and (Ref. AMM TASK 71-13-13-400-041).

NOTE: A weak handle spring has no effect on the latching mechanism, however it reduces the handle opening angle and its visibility when hanging down.

NOTE: You must use a FLASHLIGHT and an MIRROR - INSPECTION to examine areas of the fan cowl latches that are difficult to see.

(e) Make sure that the fan cowl latches are attached correctly. Tighten or replace the attachment hardware, as necessary (Ref. AMM TASK 71-13-13-000-041) and (Ref. AMM TASK 71-13-13-400-041).
(2) Do a visual inspection of the adjustable keepers of the right fan cowl (Ref. AMM TASK 71-13-13-220-041).

Subtask 71-13-13-220-061-A ** ON A/C NOT FOR ALL

B. Visual Inspection of the Area around the Latches and Adjustable Keepers
Refer to allowable damage limits in CFM56-5B section for area limits SRM 542000.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the fan cowl structure adjacent to the latches and adjustable keepers for:
A.Abrasion	Refer to allowable damage limits in CFM56-5B SRM 542000.	Refer to allowable damage limits in CFM56-5B SRM 542000.
B.Crack	None allowed.	Replace the fan cowl doors (Ref. AMM TASK 71-13-11-000-041) and (Ref. AMM TASK 71-13-11-400-041).
C.Scratch and gouge	Refer to allowable damage limits in CFM56-5B SRM 542000.	Refer to allowable damage limits in CFM56-5B SRM 542000.
D.Disbond/delamination	Refer to allowable damage limits in CFM56-5B SRM 542000.	Refer to allowable damage limits in CFM56-5B SRM 542000.
E.Hole	Refer to allowable damage limits in CFM56-5B SRM 542000.	Refer to allowable damage limits in CFM56-5B SRM 542000.
F.Dent	Refer to allowable damage limits in CFM56-5B SRM 542000.	Refer to allowable damage limits in CFM56-5B SRM 542000.
G.Loose/missing fasteners	None allowed.	Replace the loose/missing fasteners CMM 711327 for L, CMM 711328 for R.

(1) Disbond/delamination, hole or dent damage sizes not covered per allowable damage limits in CFM56-5B, are not allowed SRM 542000.
(a) The fan cowl doors must be replaced (Ref. AMM TASK 71-13-11-000-041) and (Ref. AMM TASK 71-13-11-400-041).

5. Close-up
Subtask 71-13-13-410-058-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) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:32:18 UTC