Detailed Inspection of Aft Engine Mount Installation [CFMB]

TASK 71-22-11-210-042-B
Detailed Inspection of Aft Engine Mount Installation

1. Reason for the Job
Refer to the MPD TASK: 712211-03
DETAILED INSPECTION OF AFT ENGINE MOUNT INSTALLATION
These inspection criteria are 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. Inspection of these areas are included in the ESM and CMM.

NOTE: The links have a spherical bearing at each end and can therefore rotate about the link axis if unloaded.

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	AR	FLASHLIGHT
No specific	AR	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-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-22-11-000-041-A	Removal of the Aft Engine Mount
TASK 71-22-11-400-041-A	Installation of the Aft Engine Mount
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
CMM 712207
Aft Engine Mount
Aft Engine Mount Cross Beam

3. Job Set-up
Subtask 71-22-11-941-057-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).
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 71-22-11-010-089-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

Subtask 71-22-11-040-057-A ** ON A/C NOT FOR ALL

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

Subtask 71-22-11-010-067-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

4. Procedure
Subtask 71-22-11-210-061-A ** ON A/C NOT FOR ALL

A. Do a Detailed Visual Inspection of the Aft Engine Mount

Aft Engine Mount ** ON A/C NOT FOR ALL

Aft Engine Mount Cross Beam ** ON A/C NOT FOR ALL

(1) Clean any dirt or unwanted material from the aft engine mount with a Textile-Lint free Cotton - (Material No.14SBA1) . Use a FLASHLIGHT and an MIRROR - INSPECTION to examine areas of the engine mount that are hard to see.
(2) Do this inspection on those areas of the aft engine mount that are visible without the removal of any hardware.
Visually examine for cracks. Give special attention to critical areas:

Aft Engine Mount Cross Beam ** ON A/C NOT FOR ALL

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the two halves of the beam assembly, Look for: Aft Engine Mount Cross Beam ** ON A/C NOT FOR ALL
A.Cracks.	None permitted.	If cracks are found, replace the mount assembly (Ref. AMM TASK 71-22-11-000-041) and (Ref. AMM TASK 71-22-11-400-041). Note: Discard the damaged part and inspect the mount assembly per CMM 712207 Inspection/Check procedure.

NOTE: For all other findings (nick, scratch, gouge,...) please refer to CMM 712207 (Inspection/Check procedure).

Subtask 71-22-11-210-062-A ** ON A/C NOT FOR ALL

B. Do a visual Inspection of the Aft Engine Mount
(1) Examine the retaining pins for bent shape and surface defects. Replace the damaged parts.
(2) Make sure that the pins and the bolts are correctly installed.
(3) Examine the retainers for cracks, wear, and surface damage. Replace the damaged parts.
(4) Examine the brackets for cracks, wear, and surface damage. Replace the damaged parts.

5. Close-up
Subtask 71-22-11-410-067-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 71-22-11-440-055-A ** ON A/C NOT FOR ALL

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

Subtask 71-22-11-410-092-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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

Subtask 71-22-11-942-053-A ** ON A/C NOT FOR ALL

D. Close-up
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:26:17 UTC