Installation of the Aft Engine Mount [CFMB]

TASK 71-22-11-400-041-A
Installation of the Aft Engine Mount

CAUTION: THIS PART IS A REMOVABLE STRUCTURAL COMPONENT (RSC), WHICH CAN BE MOVED BETWEEN AIRCRAFT. THUS IT CAN HAVE DIFFERENT OPERATION CONDITIONS AND A DIFFERENT LIFE RECORD (FLIGHT HOURS/FLIGHT CYCLES/CALENDAR) FROM THE AIRCRAFT IT IS INSTALLED ON OR REMOVED FROM. THE OPERATOR IS RESPONSIBLE FOR THE SPECIFIC TRACKING AND CONTINUED AIRWORTHINESS OF REMOVABLE STRUCTURAL COMPONENTS. INCORRECT MAINTENANCE OF THESE COMPONENTS CAN CAUSE A RISK FOR THE FLIGHT SAFETY.

FIN: 1550KM1 ** ON A/C NOT FOR ALL
FIN: 1550KM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 38.58 and 35 lbf.ft (5.23 and 4.75 m.daN )
No specific	Torque wrench: range to between 88.2 and 80 lbf.ft (11.96 and 10.85 m.daN )
No specific	Torque wrench: range to between 27 and 24 lbf.in (0.31 and 0.27 m.daN )
RSE1098	1	WRENCH SET - AFT ENGINE MOUNT
RSE1224	2	SPLINT-ENGINE MOUNT AFT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP5063)	silicone lubricant

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-21-11-911-001-A	Tightening Torques for Standard Threaded Fasteners
TASK 71-00-00-000-042-A	Removal of the Power Plant
TASK 71-00-00-000-042-A-01	Removal of the Power Plant with the Engine Positioner TWW 75E (MIAG)
TASK 71-00-00-000-042-A-03	Removal of the Power Plant with Jacxson Tool
TASK 71-00-00-400-042-A	Installation of the Power Plant
TASK 71-00-00-400-042-A-01	Installation of the Power Plant with the Engine Positioner TWW 75E (MIAG)
TASK 71-00-00-400-042-A-03	Installation of the Power Plant with Jacxson Tool
Aft Engine Mount

3. Job Set-up
Subtask 71-22-11-860-050-A ** ON A/C NOT FOR ALL

A. Make sure that the engine is removed (Ref. AMM TASK 71-00-00-000-042)

Subtask 71-22-11-080-052-A ** ON A/C NOT FOR ALL

B. Remove the RSE1224 SPLINT-ENGINE MOUNT AFT from the aft engine mount.

4. Procedure
Subtask 71-22-11-110-059-A ** ON A/C NOT FOR ALL

A. Cleaning

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

(1) Clean bolts (10) and pins (15) with isopropyl alcohol (Material No.CP1041) .

Subtask 71-22-11-420-051-A ** ON A/C NOT FOR ALL

CAUTION: INSTALL THE BUSHING (80) WITH ITS SHOULDER AT THE INTERIOR OF THE ENGINE RANGE.

B. Installation of the Aft Engine Mount.

NOTE: Installation of the hardware that attach the aft engine mount to the engine is the same at the three engine flanges.

(1) Put the bushings (25), (45), and the shoulder bushing (80) into the engine flange.
(2) Put the aft engine mount (85) on the engine and engage the link assemblies with the engine flanges.
(3) Apply silicone lubricant (Material No.CP5063) to the threads of the bolt (10) and to the outer surfaces of the pin (15).
(4) Install the pin (15), and the brackets (20) and (40) on the engine flange.
(5) Put the bolt (10) into the pin (15).

CAUTION: USE OF THE SPANNER WRENCHES AS A TORQUE WRENCH ADAPTER WILL CHANGE THE TORQUE VALUE WHICH IS REALLY APPLIED. THE EFFECTIVE LENGTH OF THE SPANNER WRENCHES ARE: RSE1098-1 : 6-INCHES (152.4 MM) RSE1098-5 : 8-INCHES (203.2 MM)

(6) Install the spanner

NOTE: To find the correct TORQUE value when spanner wrenches are used refer to the formula in standard practices (Ref. AMM TASK 20-21-11-911-001).

(a) Install the spanner nut (75) on the pin (15).

NOTE: Install the nut (75) with the counter bore side turned to the shear pin (15).

(7) TORQUE the spanner nut (75) to between 88.2 and 80 lbf.ft (11.96 and 10.85 m.daN )

. Use RSE1098 WRENCH SET - AFT ENGINE MOUNT (RSE1098-5) to adapt torque wrench to the spanner nut.
(8) Install the spanner nut (65) on the bolt (10).

NOTE: It is recommended that you position the flat side of the nut (65) forward.

(9) TORQUE the spanner nut (65) to between 38.58 and 35 lbf.ft (5.23 and 4.75 m.daN )

. Use RSE1098 WRENCH SET - AFT ENGINE MOUNT (RSE1098-1) to adapt the torque wrench to the spanner nut.
(10) Put the retainers (70) and (60) against the bracket (40) to make sure the bolt holes are aligned.
(11) If the holes are not aligned, increase the torque on the spanner nuts (65) and (75) to align the holes.

NOTE: Do not torque the nut (75) more than 95 lbf.ft (12.88 m.daN) or the nut (65) more than 42 lbf.ft (5.69 m.daN)

(12) If the holes are aligned, install the bolts (30), the washers (35) , (50), and the nuts (55).

NOTE: Make sure that you put the countersunk washers under the bolt heads.

(13) TORQUE nuts (55) to between 27 and 24 lbf.in (0.31 and 0.27 m.daN )

.
(14) Install the retaining pin (5) through the pin (15).

5. Close-up
Subtask 71-22-11-410-050-A ** ON A/C NOT FOR ALL

A. Install the engine (Ref. AMM TASK 71-00-00-400-042)

[Rev.10 from 2021] 2026.04.02 07:30:14 UTC