(5)
 Disconnect the electrical connectors (1) 10HL-B, (2) 10HL-C, (3) 10HL-A, (23) 10HL-E and (26) 10HL-D.

 (6)
 Put blanking caps on the disconnected electrical connectors.

 (7)
 Remove the bolts (22), the washers (21) and (where fitted) the washers (24).

 (8)
 From outside the aircraft remove the screws (7). NOTE : Identify the screws for the installation procedure.

____

 (9)
 Outflow valve removal: WARNING : SUPPORT THE UNIT/ASSEMBLY OR IT WILL FALL AND BECOME

_______ DAMAGED OR INJURE PERSONNEL. THE UNIT/ASSEMBLY IS HEAVY.
 (a) Lift and carefully remove the outflow valve (5). NOTE : The outflow valve weighs approx. 12.5 kg (27.5577 lb).
____ Make sure that you do not damage the gasket (6) and that the location pins (8) stay with the outflow valve.
 Subtask 21-31-51-020-068-A
 B. Removal of the Outflow Valve NOTE : This paragraph is only applicable for outflow valve P/N 20790-01AA
____
 and subsequent.

 (1)
 Remove the bolt (27), the washer (28) and disconnect the bonding straps (4) and (11).

 (2)
 Release the quick-release fastners (12) and remove the grill (9).

 (3)
 Disconnect the electrical connectors (1) 10HL-B, (2) 10HL-C, (3) 10HL-A, (23) 10HL-E and (26) 10HL-D.

 (4)
 Put blanking caps on the disconnected electrical connectors.

 (5)
 Remove the bolts (22), the washers (21) and (where fitted) the washers (24).

 (6)
 From outside the aircraft remove the screws (7). NOTE : Identify the screws for the installation procedure.

____

 (7)
 Outflow valve removal: WARNING : SUPPORT THE UNIT/ASSEMBLY OR IT WILL FALL AND BECOME

_______ DAMAGED OR INJURE PERSONNEL. THE UNIT/ASSEMBLY IS HEAVY.
 (a) Lift and carefully remove the outflow valve (5). NOTE : The outflow valve weighs approx. 12.5 kg (27.5577 lb).
____ Make sure that you do not damage the gasket (6) and that the location pins (8) stay with the outflow valve.
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 21-31-51Page 416 1401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 Subtask 21-31-51-410-068
 C. Close access
 (1)
 In the zone 312, disconnect and remove the 600 ohm boomset from the service interphone jack 13RJ.

 (2)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (3)
 Install the access panel 312AR.

 (4)
 Remove the access platform from the zone 312.

 (5)
 In the cockpit on the CAPT jack panel, disconnect and remove the 600 ohm headset.

 1EFF : ALL 1 21-31-51Page 417 1 1 May 01/05R 1 1 1CES 1

 TASK 21-31-51-400-001
 Installation of the Outflow Valve 10HL (From Inside)
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM_______ FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
R R  No specific No specific No specific No specific No specific No specific  feeler-gagewasher NAS1149C0416Rwasher NAS1149C0432Rwasher NAS1149C0463Raccess platform 2 m (6 ft. 7 in.) Torque Wrench : range 0.00 to 1.20 m.daN (0.00 to 9.00 lbf.ft)
 B. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
R R  6 6 6 6 6 6 6  gasket gasket gasket gasket gasket gasket gasket  21-31-04 08 -02021-31-04 08 -020A 21-31-04 08B-020 21-31-04 08B-020A21-31-04 08C-02021-31-04 08C-020A21-31-04 08E-020

 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-28-00-912-004 21-31-00-710-002 21-31-00-710-003  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)-Operational Test of the Pressure Control and MonitoringOperational Test of Manual Mode Selection and Manual Mode Pressure Control and Functional Test of Manual
 24-41-00-861-002  Mode Cabin Altitude/Outflow Valve Position IndicationEnergize the Aircraft Electrical Circuits from the External Power
　
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