Installation of the Pylon-to-Engine Aft Attach-Fittings

TASK 54-51-18-400-001-A
Installation of the Pylon-to-Engine Aft Attach-Fittings

ZONE: 415
ZONE: 425

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 16.8 and 14.6 m.daN (123.89 and 107.67 lbf.ft )
No specific	Torque wrench: range to between 29 and 25 m.daN (213.86 and 184.37 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
415	LOWER PYLON
425	LOWER PYLON
415AL, 415AR, 425AL, 425AR
415BL, 415BR, 425BL, 425BR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	BOLT	AIPC 54-51-18-01-065
3	BOLT	AIPC 54-51-18-01-075
8	NUT	AIPC 54-51-18-01-085
7	NUT	AIPC 54-51-18-01-095

E. Referenced Information

REFERENCE	DESIGNATION
TASK 54-51-21-400-001-A	Installation of the Pylon Lateral Access-Doors
TASK 71-00-00-400-040-A	Installation of the Power Plant
TASK 71-00-00-400-040-A-01	Installation of the Power Plant with the Engine Positioner TWW 75E
TASK 71-00-00-400-040-A-03	Installation 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
TASK 71-00-20-400-040-A	Installation of the Power Plant
TASK 71-00-20-400-040-A-01	Installation of the Power Plant with the Engine Positioner TWW 75E (MIAG)
Engine Aft Mount Upper Beam ** ON A/C NOT FOR ALL
Engine Aft Mount Upper Beam ** ON A/C NOT FOR ALL
Engine Aft Mount Upper Beam ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 54-51-18-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the access platform is in position.
(2) Make sure that the warning notice(s) is(are) in position.

4. Procedure
Subtask 54-51-18-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Pylon-to-Engine Aft Attach-Fittings

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

(1) Before installation, make sure that the bolts (3) and (4) are in the correct condition, if necessary replace the AIPC 54-51-18-01-075 BOLT (3) and the AIPC 54-51-18-01-065 BOLT (4).
(2) Install the locking plates (5).
(3) Install the bolts (3) and (4) with Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) .
(4) Lock the bolts (3) and (4) with the lockwashers (2) and the bolts (1).
(5) Do a check of the running torque and of the breakaway torque:
(a) Install the nuts (7) and (8) on the bolts (3) and (4).
(b) With a torque wrench calibrated to 3.4 m.daN (25.07 lbf.ft) for the nut (7) and calibrated to 4.5 m.daN (33.19 lbf.ft) for the nut (8):

Measure the running torque necessary to tighten the nuts (7) and (8) until two threads minimum show out of the nuts (7) and (8).

3.4 m.daN (25.07 lbf.ft) for the nut (7), replace the AIPC 54-51-18-01-095 NUT (7).
4.5 m.daN (33.19 lbf.ft) for the nut (8), replace the AIPC 54-51-18-01-085 NUT (8).

(d) Loosen the nuts (7) and (8).
(e) With a torque wrench calibrated to 0.36 m.daN (31.86 lbf.in) for the nut (7) and to 0.56 m.daN (49.56 lbf.in) for the nut (8):

Measure the breakaway torque necessary to loosen the nuts (7) and (8).

(f) If the breakaway torque is less than:

0.36 m.daN (31.86 lbf.in) for the nut (7), replace the AIPC 54-51-18-01-095 NUT (7)
0.56 m.daN (49.56 lbf.in) for the nut (8),
replace the AIPC 54-51-18-01-085 NUT (8).

(g) Do the same for the other nut (7) and (8).

NOTE: Before installation of the new nuts (7) and (8), do a check of the running and breakaway torque as described in para. (5).

(6) Install the pylon-to-engine aft attach-fittings (9).
(7) Install the locking plates (6) and the nuts (7) and (8).
(8) TORQUE the nuts (7) to between 16.8 and 14.6 m.daN (123.89 and 107.67 lbf.ft )

and the nuts (8) to between 29 and 25 m.daN (213.86 and 184.37 lbf.ft )

(9) Lock the nuts (7) and (8) with the lockwashers (2) and the bolts (1).

Subtask 54-51-18-420-051-A ** ON A/C NOT FOR ALL

B. Engine Installation
(1) Install the engine (Ref. AMM TASK 71-00-00-400-040).

Subtask 54-51-18-420-051-B ** ON A/C NOT FOR ALL

B. Engine Installation
(1) Install the engine (Ref. AMM TASK 71-00-20-400-040).

Subtask 54-51-18-420-051-C ** ON A/C NOT FOR ALL

B. Engine Installation
(1) Install the engine (Ref. AMM TASK 71-00-00-400-042).

5. Close-up
Subtask 54-51-18-410-050-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) Install the pylon lateral access-doors (Ref. AMM TASK 54-51-21-400-001):
(a) For the left pylon: 415AL 415AR.
(b) For the right pylon: 425AL 425AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

Subtask 54-51-18-410-050-B ** 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) Install the pylon lateral access-doors (Ref. AMM TASK 54-51-21-400-001):
(a) For the left pylon 415AL 415AR 415BL 415BR.
(b) For the right pylon 425AL 425AR 425BL 425BR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:01:01 UTC