(a) The OFF legend in the switch shows white,
 -
the respective pack system is not in operation and its flow control valve is closed,

 -
the mixer flap is at position 'C' (connects the cockpit supply duct to the pack 1 mixer chamber), or position 'O' (connects the cockpit supply duct to the pack 2 mixer chamber). The mixer flap is at position 'O' when only the PACK 1 pushbutton switch is released.

 (2)
 Switch pushed in:

 (a)
 No legend/s shown,

 -
the respective pack system is on and its flow control valve opens automatically.

 -
the mixer flap is at position 'C' or position 'O'. The mixer flap is at position 'C' when only the PACK 1 pushbutton switch is pushed in or when both the PACK 1 and PACK 2 pushbutton switches are pushed in.

 (b)
 The FAULT legend in the switch shows amber. This indicates that in the respective pack system:

 -
a compressor temperature of more than 260 deg.C (500.00 deg.F) has occured or,

 -
a pack discharge temperature of more than 95 deg.C (203.00

 deg.F) has occured. UL The switch must be switched off manually.
 **ON A/C ALL
 7. BITE Test
_________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 The pack controllers 7HH (27HH) control the BITE function for the flow control valves (Ref 21-61-00).

R **ON A/C 401-499,
 The Air Conditioning System Controllers 47HH (57HH) control the BITE function for the flow control valves (Ref 21-61-00).
R 1EFF : ALL 1 21-51-00Page 63 1 1 Aug 01/05 1 1 1CES 1

 FLOW CONTROL AND INDICATING - DEACTIVATION/REACTIVATION
_______________________________________________________

R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 TASK 21-51-00-040-001
 Deactivation of the Pack Flow-Control Valve
 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.

 NOTE : The procedure is the same for the pack flow-control valve 8HB and 11HB.
____
 1. Reason for the Job
__________________
 Refer to the MMEL TASK: 21-51-01
 Flow Control and Indicating
 Pack Flow Control Valve

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific  corrosion-resistant steel lockwire 0.8 mm
 (0.0314 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
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 53-35-13-000-002 Removal of the Quick-Release Access Panels from the Belly Fairing Structure 53-35-13-400-002 Installation of the Quick-Release Access Panels on the Belly Fairing Structure

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R  **ON A/C 001-003, 051-054,
R  21-51-00-991-001 Fig. 401 **ON A/C 004-049, 055-099, 101-105, 151-158, 201-209,
R R R  21-51-00-991-001-A Fig. 401A **ON A/C 004-049, 055-099, 101-105, 151-199, 201-299, 301-302, Post SB 21-1134 For A/C 004-049,055-099,101-105,151-158,201-209, 21-51-00-991-001-B Fig. 401B **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 3. Job Set-up__________ Subtask 21-51-00-861-050
 A. Energize the aircraft electrical circuits. (Ref. TASK 24-41-00-861-002) Subtask 21-51-00-010-051
 B. Get Access
R  (1) Remove the access panel (Ref. TASK 53-35-13-000-002): (a) FOR 8HB - 192KB, 
R  (b) FOR 11HB - 191KB. 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 21-51-00Page 402 1201-299, 301-302, 1May 01/05 1 1 1CES 1

 Subtask 21-51-00-941-051
 C. Safety Precautions
 (1) On the panel 30VU:
 (a) Make sure that: - the APU BLEED pushbutton switch is in the off position (the ON legend is off) and, - the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
　
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