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R  inlet isolation valves 5HN (FWD) and 34HN (AFT). 
R  A proximity switch, installed at the FWD cargo-compartment door, inhibits 
R  the FWD cargo-compartment heating system if the cargo-compartment door is 
R  open. This door must be closed to enable the heating system to function. 
R  A Proximity switch is installed at the AFT cargo-compartment door, it will 
R  inhibit the AFT cargo-compartment heating system if the door is open. This 
R  door must be closed to enable the AFT cargo-compartment heating system to 
R  function. 
R  The temperature control systems regulate the amount of hot air added, to 
R  give the preselected temperature in the cargo compartments. The heating 
R  controllers 1HC (FWD) and 10HC (AFT), which get information from the 
R  temperature sensors 3HC, 4HC, 13HC and 14HC, control the system. 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 21-43-00Page 17 1201-213, 401-499, 1Aug 01/05 1 1 1CES 1

R  The heating controller 1HC gets information from the temperature sensors 3HC 
R  and 4HC for the FWD cargo compartment. These sensors are installed in the 
R  inlet duct (3HC) and in the extraction duct (4HC) of the cargo compartment. 
R  The heating controller 10HC gets information from the temperature sensors 
R  13HC and 14HC for the AFT cargo compartment. These sensors are installed in 
R  the inlet duct (13HC) and at the extraction duct of the Cargo Compartment 
R  (14HC). 
R  The temperature of the air, which enters the FWD and AFT system 
R  supply-ducts, is controlled to a maximum of 70 DEG.C (158.00 DEG.F). When 
R  the duct temperature goes above 88 DEG.C (190.40 DEG.F), the FAULT light on 
R  the HOT-AIR switch 7HK (16HC) comes on and the pressure regulating-valve 
R  14HK (11HC) closes. This overheat condition will be latched by the heating 
R  controllers. When the duct temperature decreases to 70 DEG.C (158.00 DEG.F) 
R  the heating system can be reset. To do this you must push the HOT-AIR switch 
R  7HK (16HC) two times.
 **ON A/C 001-049, 051-099, 101-149, 151-199, 221-221, 224-224, 228-228,
 Post SB 21-1141 For A/C 001-049,051-099,101-105,151-199,
 Hot bleed-air from the APU bleed-air duct goes through the trim-air valve
 12HC. It then mixes with air from the cabin before going to the AFT cargo
 compartment. This air enters the supply duct upstream of the inlet
 isolation-valve 34HN.
 Proximity switches are installed at the AFT cargo-compartment door and at
 the bulk cargo-compartment door. These switches will inhibit the AFT
 cargo-compartment heating system if one of the doors is open. Both doors
 must be closed to enable the heating system to function.
 The temperature control system regulates the amount of hot air added, to
 give the preselected temperature in the AFT cargo compartment. The heating
 controller 10HC, which gets information from the temperature sensors 13HC
 and 14HC, controls the system. These sensors are installed in the inlet duct
 (13HC) and at the extraction duct of the Cargo Compartment (14HC). The
 temperature of the air, which enters the supply duct, is controlled to a
 maximum of 70 DEG.C (158.00 DEG.F) by the trim-air valve 12HC.
 When the duct temperature goes above 88 DEG.C (190.40 DEG.F), the FAULT
 light on the HOT AIR switch 16HC comes on and the pressure regulating-valve
 11HC closes. This overheat condition is latched by the heating controller.
 When the duct temperature decreases to 70 DEG.C (158.00 DEG.F) the system
 can be reset. To do this you must push the HOT AIR switch 16HC two times. 

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-43-00Page 18 1221-221, 224-224, 228-228, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C 201-220, 222-223, 225-227, 229-299, 301-399,

 Post SB 21-1141 For A/C 201-213,
 Hot bleed-air from the APU bleed-air duct goes through the trim-air valve 12HC. It then mixes with air from the cabin before going to the AFT cargo compartment. This air enters the supply duct upstream of the inlet isolation-valve 34HN. A proximity switch, installed at the AFT cargo-compartment door, inhibits the AFT cargo-compartment heating system if the cargo-compartment door is open. This door must be closed to enable the heating system to function. The temperature control system regulates the amount of hot air added, to give the preselected temperature in the AFT cargo compartment. The heating controller 10HC, which gets information from the temperature sensors 13HC and 14HC, controls the system. These sensors are installed in the inlet duct (13HC) and at the extraction duct of the Cargo Compartment (14HC). The temperature of the air, which enters the supply duct, is controlled to a maximum of 70 DEG.C (158.00 DEG.F) by the trim-air valve 12HC. When the duct temperature goes above 88 DEG.C (190.40 DEG.F), the FAULT light on the HOT AIR switch 16HC comes on and the pressure regulating-valve 11HC closes. This overheat condition is latched by the heating controller. When the duct temperature decreases to 70 DEG.C (158.00 DEG.F) the system can be reset. To do this you must push the HOT AIR switch 16HC two times.
　
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