(4)
 Remove and discard the seal (8).

 (5)
 Disengage the tab washers (6) and remove the bolts (7) and the tab washers (6). Remove the check valve (2) from the mounting block. Discard the tab washers (6).

 (6)
 Remove and discard the O-ring (1).

 1EFF : ALL 1 28-16-42Page 403 1 1 Aug 01/05 1 1 1CES 1

 Check-valve
 Figure 401/TASK 28-16-42-991-001

R 1EFF : 001-049, 051-099, 101-105, 151-158, 1 28-16-42Page 404 1201-210, 301-399, 1May 01/05 1 1 1CES 1

 Check-valve Figure 401A/TASK 28-16-42-991-001-A
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-16-42Page 405 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1

 (7) Put blanking plugs on the disconnected line ends.
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499, Post SB 28-1103 For A/C 001-049,051-099,101-105,151-158,201-210, Subtask 28-16-42-020-050-A
 A. Removal of the Fuel Recirculation Check-Valve
 (1)
 Put a container below the check valve (2).

 (2)
 Remove the nut (6), the bolt (3) and disconnect the bonding strips,

 (4) and (5).

 (3)
 Remove and discard the lockwire from the bolts (11). Remove the bolts (11), the washers (10) and the plates (12).

 (4)
 Remove and discard the seal (9).

 (5)
 Disengage the tab washers (7) and remove the bolts (8) and the tab washers (7). Remove the check valve (2) from the mounting block. Discard the tab washers (7).

 (6)
 Remove and discard the O-ring (1).

 (7)
 Put blanking plugs on the disconnected line ends.

 1EFF : ALL 1 28-16-42Page 406 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL

 TASK 28-16-42-400-001
 Installation of the Fuel Recirculation Check-valve
 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 3.1 m (10 ft. 2 in.)

 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. 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)
 Material No. 19-010  USA AMS 5687 LOCKWIRE STAINLESS STEEL ANNEALED 0.8MM DIA (Ref. 20-31-00)
 1EFF : ALL 1 28-16-42Page 407 1 1 May 01/04R 1 1 1CES 1

 C. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
1 O-ring 28-16-05 07A-040 1 O-ring 28-16-05 07C-040 1 O-ring 28-16-05 07D-040 6 tab washers 28-16-05 07A-020 6 tab washers 28-16-05 07C-020 6 tab washers 28-16-05 07D-020 7 tab washers 28-16-05 07A-020 7 tab washers 28-16-05 07C-020 7 tab washers 28-16-05 07D-020 8 seal 28-16-06 01A-120 8 seal 28-16-06 01A-120A 9 seal 28-16-06 01A-120 9 seal 28-16-06 01A-120A
 D. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
12-11-28-650-003  Pressure Refuel with Automatic Control
 20-28-00-912-004  Electrical Bonding of Components With Conductive Bolts and Screws and Bonding Straps in the Fuselage and in the Wings (this does not include the tanks)-
28-00-00-910-001 Fuel Safety Procedures 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
 73-11-50-360-002 Leak Check of the Fuel Return Valve

 **ON A/C 001-049, 051-099, 101-105, 151-158, 201-210, 301-399,
 28-16-42-991-001  Fig. 401
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
　
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