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R  **ON A/C 401-499, 
R  B. Control and Indication 
R  (Ref. Fig. 001) 
R  The AFT ISOL VALVE switch 36HN is installed on panel 22VU in the cockpit 
R  overhead panel. It controls the isolation valves 33HN, 34HN and the 
R  extraction fan 35HN. The cargo ventilation controller 10HN will only 
R  start the fan if a fully open signal is received from both isolation 
R  valves. With the isolation valve switch 36HN pressed-in, the isolation 
R  valves 33HN and 34HN open fully and the extraction fan 35HN starts. With 
R  the isolation valve switch pressed-out, OFF light comes on white, the 
R  isolation valves close and the extraction fan stops. The FAULT light 
R  comes on amber if either isolation valve is not fully open or fully 
R  closed. 
R  If there is an isolation valve disagree (not fully open or not fully 
R  closed) the ventilation controller will also send a signal to the Flight 
R  Warning Computer (FWC). 
R  If there is an extraction fan fault, the ventilation controller gives a 
R  signal to the FWC via the ACSC1 47HH which generates the appropriate 
R  failure message for the Centralized Fault-Display System (CFDS) (Ref. 
R  21-63-00 or 31-32-00).

 

 CARGO COMPARTMENT VENTILATION - DEACTIVATION/REACTIVATION
_________________________________________________________
 TASK 21-28-00-040-002
 Deactivation of the Aft Cargo-Compartment Ventilation Isolation-Valves 33HN,
 34HN
 1. Reason for the Job
__________________
 Refer to the MMEL TASK: 21-28-05
 Cargo Compartment Ventilation
 AFT cargo
 Isolation Valve

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 2 m (6 ft. 7 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 R 25-55-11-000-003 Removal of the Sidewall Panels in the AFT Cargo Compartment - FR47/FR59 25-55-11-400-003 Installation of the Sidewall Panels in the AFT Cargo
 Compartment - FR47/FR59 25-55-12-000-001 Removal of the AFT Cargo Compartment Partition FR65 25-55-12-400-001 Installation of the AFT Cargo Compartment Partition
 FR65 52-30-00-860-001 Open the FWD or AFT Cargo-Compartment Door with the Yellow Electric Pump 52-30-00-860-002 Close the FWD or AFT Cargo-Compartment Door with the Yellow Electric Pump

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 21-28-00-991-002 Fig. 401 R **ON A/C 151-199, 401-499,
 21-28-00-991-002-A Fig. 401A
 **ON A/C ALL

 3. Job Set-up
__________
 Subtask 21-28-00-861-058

 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-28-00-865-059
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/AFT CARGO VENT/FAN 30HN S22

 

R **ON A/C ALL
 Subtask 21-28-00-865-078
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION FIN LOCATION -------------------------------------------------------------------------------
122VU AIR COND/AFT CARGO VENT/CTL AND/MONG 31HN 20 S or alternative location :-49VU AIR COND/AFT CARGO/VENT/CTL & MONG 31HN 07 C
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 Subtask 21-28-00-010-055
 D. Get Access
　
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