W DOC AIRBUS | AMM A320F

Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals (PRE SB LEAP 72-00-0206 and/or PRE SB LEAP 72-00-0271) [CFML]

TASK 72-24-80-200-802-A
Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals (PRE SB LEAP 72-00-0206 and/or PRE SB LEAP 72-00-0271)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
ZONE: 400
1. Reason for the Job
This procedure gives the criteria for the visual inspection of the VBV duct seals.
NOTE: The inspection criteria below are applicable after the removal of the high metal.
NOTE: You can use equivalent alternatives for the standard tools, the equipment and the consumable materials.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 71-13-00-010-803-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A
Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A
Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A
Closing of the Thrust Reverser Cowl Doors
F Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals
3. Job Set-up
Subtask 72-24-80-941-053-A
A. Safety Precautions
   (1) On the center pedestal, on ENG panel 115VU:
     (a) Make sure that the ENG/MODE selector switch is in the NORM position.
     (b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
     (c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
  • The ENG/MODE selector switch
  • The ENG/MASTER 1(2) control switch.
   (2) On the ENG section of maintenance panel 50VU:
     (a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 72-24-80-010-056-A
B. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803).
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
   (2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 72-24-80-040-053-A
C. Deactivation of the Thrust Reverser System for Maintenance
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
   (1) Do the deactivation of the thrust reverser system for the ground maintenance (Ref. AMM TASK 78-30-00-040-809).
Subtask 72-24-80-010-057-A
D. Get Access
   (1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806).
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
4. Procedure
Subtask 72-24-80-210-051-A
A. Do a visual inspection of the VBV duct seals (1) and (2)
F Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals
   (1) Visual inspection of the seal profile of the VBV duct seals (1) and (2)
F Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Signs of wear, textile delamination and color change
Not serviceable

2.Breaks, cracks and scratches
Not serviceable

3.Bubbles
Not serviceable

4.Signs of permanent strain or excessive strain
Not serviceable

   (2) Visual inspection of the seal rubber pins of the VBV duct seals (1) and (2)
F Visual Inspection of the Variable Bleed Valve (VBV) Duct Seals
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Missing pins
Permitted if no consecutive pins are missing.

2.Signs of looseness
Not serviceable

3.Signs of deviation
Not serviceable

5. Close-up
Subtask 72-24-80-410-055-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806).
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
Subtask 72-24-80-440-052-A
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 72-24-80-410-056-A
C. Close Access
   (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803).
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 02:53:28 UTC
"Aviabrain" 2025