(b)
 On the CAPT jack panel, connect the 600 ohm headset to the related connector.

 (c)
 On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.

 (d)
 On the CABIN PRESS panel 25VU, make sure that the MODE SEL pushbutton switch is in the MAN position.

 (e)
 On the CABIN PRESS panel 25VU, set the MAN V/S CTL toggle switch to the DN position to close the outflow valve.

R 1EFF : ALL 1 21-31-51Page 412 1 1 May 01/05 1 1 1CES 1

 Subtask 21-31-51-865-050
 F. Open, safety and tag this(these) circuit breaker(s):
R  -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/CAB/PRESS/CTL1 1HL D09 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399, 
R R  122VU AIR COND/AFT CARGO VENT/FAN **ON A/C ALL  30HN  S22 
R R R  122VU AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY 122VU AIR COND/CAB PRESS/CTL/MAN 122VU AIR COND/CAB PRESS/CTL/2 4. Procedure_________ 6HU 3HL 2HL  U19 Y23 Y22
 **ON A/C 001-049, 051-061, 101-105,
 (Ref. Fig. 401/TASK 21-31-51-991-001) **ON A/C 062-099,
R  (Ref. Fig. 401A/TASK 21-31-51-991-001-C) **ON A/C 106-149, 151-199, 204-299, 301-399, 401-499,
 (Ref. Fig. 401B/TASK 21-31-51-991-001-B) **ON A/C 201-203,
 (Ref. Fig. 401C/TASK 21-31-51-991-001-A)

 **ON A/C 001-049, 051-099, 101-105,
 Subtask 21-31-51-020-070
 A. Removal of the Outflow Valve
 NOTE : This paragraph is only applicable for outflow valve P/N

____
 9023-15703-81 and previous.

 (1)
 Remove the nut (29), the bolt (27), the washers (28) and disconnect the bonding strap (4).

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

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove the bolts (22), the washers (21) and (where fitted) the washers (24).

 (5)
 From outside the aircraft remove the screws (7). NOTE : Identify the screws for the installation procedure.

____

 (6)
 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
 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 strap (4).
 1EFF : 001-049, 051-099, 101-105, 1 21-31-51Page 414 1 1 Aug 01/05R 1 1 1CES 1

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

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove the bolts (22), the washers (21) and (where fitted) the washers (24).

 (5)
 From outside the aircraft remove the screws (7). NOTE : Identify the screws for the installation procedure.

____

 (6)
 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 **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-31-51-020-070-A
 A. Removal of the Outflow Valve NOTE : This paragraph is only applicable for outflow valve P/N
____
 9023-15703-81 and previous.

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

 (2)
 Release the quick-release fasteners (12) and remove the grill (9) from the retaining clips (10)

 (3)
 Put the bonding strap (4) in position and temporarily install the washer (28) and the bolt (27).

 (4)
 Remove the nut (32), the bolt (30), the washers (31) and disconnect the bonding strap (4).
　
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