Installation of the Lower Fairing

TASK 54-56-00-400-002-A
Installation of the Lower Fairing

ZONE: 470
ZONE: 480

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 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
470	ENGINE 1 AFT PYLON
480	ENGINE 2 AFT PYLON

C. Referenced Information

REFERENCE	DESIGNATION
TASK 54-54-00-200-002-A	Detailed Inspection of the Pylon Aft Fixed Fairing
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
Lower Fairing

3. Job Set-up
Subtask 54-56-00-860-058-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the access platform and the warning notices are in position
(2) Make the thrust reverser unservicable (Ref. AMM TASK 78-30-00-040-012)

Subtask 54-56-00-200-050-A ** ON A/C NOT FOR ALL

B. Inspection of Pylon Aft Fixed Fairing
(1) Do a detailed inspection of the pylon aft fixed fairing (Ref. AMM TASK 54-54-00-200-002).

4. Procedure
Subtask 54-56-00-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the Lower Fairing

Lower Fairing ** ON A/C NOT FOR ALL

(1) Install the centering pins and install the lower fairing (9):
(a) For the left pylon: 473AL
(b) For the right pylon: 483AL

Subtask 54-56-00-820-051-B ** ON A/C NOT FOR ALL

B. Adjustment of the Lower Fairing

Lower Fairing ** ON A/C NOT FOR ALL

(1) Measure the clearances J1 and J2:
(a) Make sure that the clearance J1 is 3 +2 mm or -2 mm (0.1181 +0.0787 in. or -0.0787 in.) between the lower fairing and the primary structure and between the RIB 8 and the RIB 10.
(2) Make sure that the variable clearance J2 is between 3.1 +2 mm or -1 mm (0.1220 +0.0787 in. or -0.0394 in.) and 8 +0 mm or -2 mm (0.3150 +0.0000 in. or -0.0787 in.) between:

The lower fairing and the secondary structure, the RIB 10 and the fairing aft end section.

(3) If the values of the clearances you measured are not correct you can:

remove the bolt (6), the washer (2) and adjust with the shims (7)
or remove the nuts (1), the nut holders (3), the bolts (5) and adjust with the shims (4).

NOTE: For all adjustment procedure you must install the bolts (5), the nuts (1) and the nut holders (3) on the fitting.

(4) Install the bolts (8) and TORQUE to between 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )

5. Close-up
Subtask 54-56-00-440-058-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-440-012).

Subtask 54-56-00-942-053-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:52:43 UTC