Fuel - Fuel Leak from AFT Pylon Drain Ports

TASK 28-11-00-810-814-A
Fuel - Fuel Leak from AFT Pylon Drain Ports

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Possible Causes

engine feed pipe damaged O-ring or connector

2. Job Set-up Information
A. Consumable Materials

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

B. Referenced Information

REFERENCE	DESIGNATION
AMM 05-24-10-200-001	GENERAL VISUAL INSPECTION OF UPPER F0RWARD PYLON (EWIS)
AMM 05-24-10-200-002	GENERAL VISUAL INSPECTION OF LOWER PYLON (EWIS)
AMM 28-20-00-960-001	Discard "O" Rings on Pylon Engine Fuel Feed Pipe Connectors and replace by new "O" Rings
SRM 517612
AMM 54-50-00-220-001	Detailed Inspection of the CAF4 Sealant in Pylon Cantilever ZONE "A"
SRM 572112

3. Fault Confirmation
Subtask 28-11-00-710-066-A

A. Test
(1) If there is a fuel leak from an AFT pylon drain port, do the fault isolation in Para. 4. A.

NOTE: The cause of fuel leak from an AFT pylon drain port can be an engine feed pipe damaged O-ring or connector .

NOTE: Fuel leaks from the AFT pylon drain ports are not permitted.

4. Fault Isolation
Subtask 28-11-00-810-063-A

A. Procedure
(1) Do a check of the applicable engine feed pipe line and repair the leaks found, AMM 28-20-00-960-001.
(2) Get access to compartment A of the applicable pylon AMM 05-24-10-200-001.
(a) Do a visual inspection in compartment A for fuel leaks from:

the fuel pipes
the pipe connections and joints
the visible fuel tank structure.

1 If you cannot see signs of a leak use a Textile-Lint free Cotton - (Material No.14SBA1) against the applicable components and tank structure.

NOTE: If the cloth becomes wet, there is a small leak.

(b) Repair all leaks from damaged pipes (Ref. Duct and Fuel Pipe Repair Manual).
(c) Repair all leaks from the damaged structure SRM 572112.
(d) Make sure that there is no blockage in the drain of compartment A.
(e) Do the detailed inspection of the CAF4 sealant in pylon cantilever ZONE "A" procedure AMM 54-50-00-220-001.
(3) Get access to compartment F of the applicable pylon AMM 05-24-10-200-002.
(a) Do a visual inspection in compartment F for fuel leaks from:

the fuel pipes
the pipe connections and joints
the visible fuel tank structure.

1 If you cannot see signs of a leak use a Textile-Lint free Cotton - (Material No.14SBA1) against the applicable components and tank structure.

NOTE: If the cloth becomes wet, there is a small leak.

(b) Repair all leaks from damaged pipes (Ref. Duct and Fuel Pipe Repair Manual).
(c) Repair all leaks from the damaged structure SRM 517612.
(d) Make sure that there is no blockage in the drain of compartment F.

[Rev.8 from Aug 2018] 2026.04.04 04:28:27 UTC