R 1EFF : 151-199, 401-499, 1 21-43-00Page 11 1 1 Aug 01/05 1 1 1CES 1

 AFT Cargo Compartment - Component Location R Figure 001E (SHEET 1)
R 1EFF : 201-220, 222-223, 225-227, 229-299, 1 21-43-00Page 12 1 1 May 01/05 1 1 1CES 1

 AFT Cargo Compartment - Component Location R Figure 001E (SHEET 2)
R 1EFF : 201-220, 222-223, 225-227, 229-299, 1 21-43-00Page 13 1 1 May 01/05 1 1 1CES 1 **ON A/C ALL

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
 | | | | DOOR | REF. -------------------------------------------------------------------------------10HC CONT-CARGO HEAT 96VU 122 811 21-43-34 11HC VALVE-PRESS REG 197 197BB 21-43-52 12HC VALVE-TRIM AIR, AFT CARGO COMPT 197 197BB 21-43-51 13HC SENSOR-DUCT TEMP 151EW 151 826 21-43-15 14HC SENSOR-COMPT TEMP 150 826 21-43-15 15HC SEL-CARGO HEAT/AFT 22VU 210 21-43-00
 3. System Description
__________________
 **ON A/C 001-049, 051-099, 101-149, 221-221, 224-224, 228-228,
 (Ref. Fig. 002)

R **ON A/C 151-199, 201-220, 222-223, 225-227, 229-299, 301-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C 001-049, 051-099, 101-105,
 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 in a housing in the compartment ceiling (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.

 Aft Cargo Compartment - General Schematic
 Figure 002

R 1EFF : 001-049, 051-099, 101-149, 221-221, 1 21-43-00Page 15 1224-224, 228-228, 1May 01/05 1 1 1CES 1

 AFT Cargo Compartment - General Schematic
 Figure 002A

R 1EFF : 151-199, 201-220, 222-223, 225-227, 1 21-43-00Page 16 1229-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 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.
 **ON A/C 151-199, 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 in a housing in the compartment ceiling (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  **ON A/C 401-499, 
R  Hot bleed-air from the APU bleed-air duct goes through the trim air valves 
R  2HC (FWD) and 12HC (AFT). It then mixes with air from the cabin and goes 
R  into the cargo compartments. This air enters the supply duct upstream of the 
　
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