(2)
 Remove the bolts (3), the bolt (4) and the air release valve (1).

 (3)
 Remove and discard the O-ring (2) and seal the RIB 8 connector with a blanking cap.

 1EFF : ALL 1 28-21-41Page 403 1 1 Aug 01/05 1 1 1CES 1

 Low-Pressure Air Release-Valve
 Figure 401/TASK 28-21-41-991-001

R 1EFF : 001-001, 051-052, 1 28-21-41Page 404 1 1 May 01/05 1 1 1CES 1

R  Low-Pressure Air Release-Valve 
R  Figure 401A/TASK 28-21-41-991-001-B 
R 1EFF :  301-399,  1  28-21-41 Page 405 
1  1  May 01/04
 1  1
 1CES  1

 Low-Pressure Air Release-Valve
 Figure 401B/TASK 28-21-41-991-001-A

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-41Page 406 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 TASK 28-21-41-400-001

 Installation of the Low Pressure (LP) Air-Release-Valve 86QM(87QM)
 WARNING : MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING
_______ NOTICES ARE IN POSITION.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______ GEAR.
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific safety barriers
 No specific access platform 3.2 m (10 ft. 6 in.)
 No specific container 5 l (1.3208 USgal)

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 01-001 USA ASTM-D-1655-93 (JET A-1) FUEL, TURBO (Ref. 20-31-00) Material No. 04-012 USA VV-P-236 PURE MINERALVASELINE OR PETRO- LATUM (Ref. 20-31-00)
 Material No. 09-002  USA MIL-S-8802 TYPE I CLASS B FUEL TANK SEALANTPOLYSULFID(NO LONGER AVAILABLE (Ref. 20-31-00)
 Material No. 11-026 GB DEF-STAN 68-148/1 SOLVENT GENERAL PURPOSE (Ref. 20-31-00) Material No. 19-003 USA AMS 3819 LINT-FREE COTTON CLOTH (Ref. 20-31-00)
 1EFF : ALL 1 28-21-41Page 407 1 1 May 01/05R 1 1 1CES 1

 C. Expendable Parts -------------------------------------------------------------------------------
FIG.ITEM --------- |DESIGNATION ------------------------------------ |IPC-CSN----------------------------------
2  O-ring  28-21-05 24B-200
 2  O-ring  28-21-05 24C-200
 D. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-11-28-650-003  Pressure Refuel with Automatic Control
 12-11-28-650-004  Pressure Refuel with Manual Control
 24-41-00-861-002  Energize the Aircraft Electrical Circuits from the External Power
 24-41-00-862-002  De-energize the Aircraft Electrical Circuits Supplied from the External Power
 28-10-00-910-001 28-10-00-910-002  Safety Procedures When You Do Work in a Fuel TankAccess to the Fuel Tanks and the Work Areas
 28-25-00-650-001  Pressure Defuel
 28-25-00-650-003  To Drain Remaining Fuel from the Wing Tanks and the Center Tank
 28-25-00-869-001  Fuel Transfer
 57-27-11-000-001  Removal of the Access Panel (540AB, 540BB, 540CB, 540DB, 540EB, 540FB, 540GB, 640AB, 640BB, 640CB,
 57-27-11-400-001  640DB, 640EB, 640FB, 640GB)Installation of the Access Panel (540AB, 540BB, 540CB, 540DB, 540EB, 540FB, 540GB, 640AB, 640BB,
 640CB, 640DB, 640EB, 640FB, 640GB) 

R **ON A/C 001-001, 051-052,
 28-21-41-991-001 Fig. 401 **ON A/C 301-399, 28-21-41-991-001-B Fig. 401A
 1EFF : ALL 1 28-21-41Page 408 1 1 May 01/05 1 1 1CES 1 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499, Post SB 28-1077 For A/C 001-001,051-052, 28-21-41-991-001-A Fig. 401B **ON A/C ALL
 3. Job Set-up
__________
 Subtask 28-21-41-941-054

 A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
　
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