Special Detailed Inspection (Endoscope) of Forward Engine Mount Link Lugs [CFMI]

TASK 71-21-12-200-803-A
Special Detailed Inspection (Endoscope) of Forward Engine Mount Link Lugs

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Refer to the MPD TASK: 712112-01
SPECIAL DETAILED INSPECTION (ENDOSCOPE) OF FORWARD ENGINE MOUNT LINK LUGS
This inspection criteria is only for those parts of the engine that you can see when the engine is installed on an airplane. The limits and remarks are not applicable to the areas of the mount that you cannot see when the engine is installed.
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	BORESCOPE - FLEXIBLE
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-21-11-000-040-A	Removal of the Forward Engine Mount System
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
CMM 712106
Forward Engine Mount Link Lugs
Forward Engine Mount Cross Beam
Forward Engine Mount Link
Forward Engine Mount Support

3. Job Set-up
Subtask 71-21-12-941-057-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 71-21-12-010-070-A ** ON A/C NOT FOR ALL

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

Subtask 71-21-12-040-059-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser

WARNING: MAKE THE THRUST REVERSER UNSERVICEABLE. IF THE THRUST REVERSER IS NOT MADE UNSERVICEABLE, IT CAN OPERATE ACCIDENTALLY BECAUSE THE BLOCKER DOOR HOLD-OPEN ROD DOES NOT RESIST THE ACTUATOR HYDRAULIC PRESSURE. THIS CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

(1) Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 71-21-12-010-071-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 71-21-12-160-050-A ** ON A/C NOT FOR ALL

E. Clean the Engine Mount
(1) Clean any dirt or unwanted material from the lugs with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 71-21-12-210-057-A ** ON A/C NOT FOR ALL

A. Special Detail Inspection of Forward Engine Mount Link Lugs
(1) Do a special detail inspection of forward engine mount lugs. Use a FLASHLIGHT, MIRROR - INSPECTION and BORESCOPE - FLEXIBLE dia. up to 5 mm (0.1969 in.) to examine areas of the lugs that are hard to see.
(2) Do this inspection on those areas of the forward engine mount that are visible without the removal of any hardware.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the two cross beam lugs, look for: Forward Engine Mount Cross Beam ** ON A/C NOT FOR ALL
A.Cracks.	None permitted.	If cracks are found replace the mount (Ref. AMM TASK 71-21-11-000-040). NOTE: Discard the damaged part and inspect the mount assembly per CMM 712106 (inspection/check procedure).
2.Examine the two link assemblies, look for: Forward Engine Mount Link ** ON A/C NOT FOR ALL
A.Cracks.	None permitted.	If cracks are found replace the mount (Ref. AMM TASK 71-21-11-000-040). NOTE: Discard the damaged part and inspect the mount assembly per CMM 712106 (inspection/check procedure).
3.Examine the two support assemblies,look for: Forward Engine Mount Support ** ON A/C NOT FOR ALL
A.Cracks.	None permitted	If cracks are found, replace the mount (Ref. AMM TASK 71-21-11-000-040). NOTE: Discard the damaged part and inspect the mount assembly per CMM 712106 (inspection/check procedure).

NOTE: For all other findings (nick, scratch, gouge...) please refer to CMM 712106 (inspection/check procedure).

5. Close-up
Subtask 71-21-12-410-071-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 thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 71-21-12-440-057-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 71-21-12-410-072-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 02:22:49 UTC