Clean the Fan Cowl No. 1 Lockable Latch (SBN71-0331) [IAE]

TASK 71-13-13-100-801-A
Clean the Fan Cowl No. 1 Lockable Latch (SBN71-0331)

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Do this procedure if the key cannot be engaged or turned correctly in the lock.

NOTE: SBN71-0331 (equivalent to Airbus service bulletin SB 71-1069) introduces a lockable latch in the forward position (latch number 1) that must be opened and closed and locked with a key and flag assembly. The key and flag assembly are stowed in the cockpit and must not be used if there is damage to the key or flag.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	BRUSH - NYLON
No specific	1	MALLET - FIBER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-124)	Isopropyl Alcohol, Technical grade
(Material No.V01-338)	Cleaning solvent
(Material No.V02-174)	cotton wool swab
(Material No.V10-067)	lubricant
(Material No.V10-108)	lubricant

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)

3. Job Set-up
Subtask 71-13-13-941-063-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize FADEC 1(2).

4. Procedure
Subtask 71-13-13-160-050-A ** ON A/C NOT FOR ALL

A. Clean the Fan-Cowl No. 1 Lockable Latch (SBN71-0331)
(1) Remove solid particles or unwanted materials from the lock.

NOTE: These steps can be used in any sequence and repeated until the key and lock operates correctly.

(a) Use a MALLET - FIBER or other applicable percussion tool and apply moderate taps to the key opening area of the latch to help release unwanted debris.
(b) Use a BRUSH - NYLON on the key opening to loosen debris.
(c) Blow compressed air into the key opening. Keep a part of the opening uncovered to let the debris out.
(d) Apply a high volume of pressurized water into the key opening. Keep a part of the opening uncovered to let the debris out.
(e) Put cotton wool swab (Material No.V02-174) soaked with the V01-124Isopropyl Alcohol, Technical grade or Cleaning solvent (Material No.V01-338) through the key opening to help release unwanted debris.
(f) Spray a large quantity of an applicable lubricant (Material No.V10-108) through the key opening into the lock and around mechanism.
(g) Spray a large quantity of an applicable wet lubricant (Material No.V10-067) through the key opening into the lock and around the mechanism.

5. Close-up
Subtask 71-13-13-410-062-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 fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:29:37 UTC