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 B. AFT Cargo-Compartment Isolation-Valves (Ref. Fig. 005) The isolation valves 33HN and 34HN are electrically operated butterfly valves. Each consists of a body assembly and an actuator housing which are bolted together and internally connected. The actuator housing contains a gear-train, two microswitches, a 28 VDC motor and an electrical connector. The 28 VDC motor drives the gear-train, which turns a shaft to which the butterfly valve is attached. Two microswitches signal the fully open/fully closed position of the isolation valves 33HN and 34HN to the cargo ventilation controller 10HN. Accidental blockage of either isolation valve will cause a torque limit mechanism to disengage the gear-train. This protects the gear-train and butterfly valve from damage. A manual override and visual position indicator is connected to the end of the shaft at the top of the actuator.
 C. Extraction Fan (Ref. Fig. 006) The AFT cargo extraction fan 35HN is installed in line with the extraction duct. It is powered by a three-phase four-pole induction motor that drives a fan-wheel. This fan runs continuously when the aircraft is on the ground or in flight. Thermo switches are installed inside the motor stators of the extraction fan. If the temperature of the stators gets to 140 DEG.C. (254 DEG.F), the thermo switches isolate the electrical supply to the fan. The AFT cargo extraction fan 35HN is secured with clamps to brackets on the aircraft structure in the rear underfloor area. Arrows on the fan casing show the direction of airflow through the fan and the direction that the fan-wheel rotates. If the impeller breaks up, the casing is strong enough to contain the debris.
 6. Operation/Control and Indicating________________________________
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 003)

 

 Isolation Valve Figure 005
 1EFF : 1 1R 1CES  ALL  1 11 1 21-28-00 Page 15 Aug 01/05

 

 Extraction Fan
 Figure 006
 1EFF :  ALL  1  21-28-00 Page 16 
1  1  Aug 01/05
 1  1
 1CES  1

 

 **ON A/C 151-199,
 (Ref. Fig. 003A)

R **ON A/C 401-499,
R (Ref. Fig. 003B)
 **ON A/C ALL
 A. Operation The extraction fan of the ventilation system for the AFT cargo compartment operates when the aircraft is on ground and in flight. The cargo ventilation controller 10HN opens the isolation valves 33HN and 34HN. After the ventilation controller receives fully open signals from both valves, it starts the extraction fan 35HN. The controller will close the isolation valves, and stop the extraction fan when:
 -
the isolation valve switch 36HN is selected OFF,

 -
the smoke detection control unit 10WQ detects smoke in the AFT cargo compartment (Ref. 26-16-00).

 NOTE : In this case the isolation valves are closed/latched. Reopening is
____ only possible in the absence of a smoke signal by power interrupt.
 -the cargo SMOKE TEST switch 13WH located in the overhead panel (22VU) is pressed.
 NOTE : If the smoke test switch is pressed, the controller will receive
____ the test signal and the simulated smoke signal, the latter a few seconds later. In this case the isolation valves are closed but not latched. Reopening happens, if the SMOKE-signal is removed a few seconds earlier than the Test-signal, which is controlled by the smoke detection and control unit automatically.

R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 B. Control and Indication
 (Ref. Fig. 001)
 The AFT ISOL VALVE switch 36HN is installed on panel 22VU in the cockpit
 overhead panel. It controls the isolation valves 33HN, 34HN and the
 extraction fan 35HN. The cargo ventilation controller 10HN will only
 start the fan if a fully open signal is received from both isolation
 valves. With the isolation valve switch 36HN pressed-in, the isolation
 valves 33HN and 34HN open fully and the extraction fan 35HN starts. With
 the isolation valve switch pressed-out, OFF light comes on white, the
 isolation valves close and the extraction fan stops. The FAULT light
 comes on amber if either isolation valve is not fully open or fully
 closed.
 If there is an isolation valve disagree (not fully open or not fully
 closed) the ventilation controller will also send a signal to the Flight
 Warning Computer (FWC).
 If there is an extraction fan fault, the ventilation controller gives a
 signal to the FWC via the zone controller 8HK which generates the
 appropriate failure message for the Centralized Fault-Display System
 (CFDS) (Ref. 21-63-00 or 31-32-00). 
　
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