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R  **ON A/C 106-149, 211-299, 301-399, 401-499, 
R  (Ref. Fig. 006A) 
R  **ON A/C 106-149, 221-223, 225-299, 301-399, 401-499, 
R  (Ref. Fig. 007A) 
R  **ON A/C 211-220, 224-224, 
R  (Ref. Fig. 007B) 
R  **ON A/C 106-149, 211-299, 301-399, 401-499,
 You can use the APU to supply bleed-air to the user systems, while on the ground and during flight. The APU can supply bleed-air during the climb of the aircraft from the ground to an altitude of 20,000 ft.(6096 m). The APU has a APU bleed control valve which operates fully automatic (Ref. 49-51-00). The APU supplies the bleed-air to the user systems when the APU bleed control valve is in the open position. The supply of the bleed-air is in accordance with demand of the user systems. The APU bleed control valve is a part of the APU. It has a valve section with a butterfly flap, an actuator and a servo valve. A fixed link linear rotary-actuator moves the butterfly flap. The actuator is controlled by a servo valve which is operated by fuel pressure. 

R 1EFF : ALL 1 36-12-00Page 24 1 1 Aug 01/05 1 1 1CES 1

 The APU Electronic Control Box (ECB) 59KD receives the signals of the bleed-air demand.The ECB 59KD monitors the bleed-air supply and also controls the APU bleed control valve. The APU bleed-air duct connects the APU to the crossbleed duct. A check valve installed in the APU bleed-air duct protects the APU when a different source supplies bleed air with a higher pressure. The crossbleed duct is in the unpressurized area and connects the left and right bleed-air systems. The crossbleed duct has a crossbleed valve which controls the bleed-air supply to the left and right bleed-air systems. When the engine Pressure Reducing Valves (PRV) close the crossbleed valve then opens automatically when the APU supplies the bleed-air. The crossbleed valve is an electrical shut-off valve controlled by the Bleed-Air Monitoring Computer (BMC) for the automatic operation. You can also operate it manually from the cockpit.
 **ON A/C ALL
 4. Power Supply____________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 (Ref. Fig. 006) 
R  **ON A/C 106-149, 211-299, 301-399, 401-499,
 (Ref. Fig. 006A)
 **ON A/C 001-049, 051-060, 101-102,
 (Ref. Fig. 007) 
R  **ON A/C 106-149, 221-223, 225-299, 301-399, 401-499, 
R
 (Ref. Fig. 007A) 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 224-224, 
R  Post SB  21-1121 For A/C 001-049,051-060,101-102, 
R  (Ref. Fig. 007B) 

R 1EFF : ALL 1 36-12-00Page 25 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C 001-049, 051-060, 101-102,

 The DC electrical system of the aircraft provides the APU bleed-air supply and the crossbleed system with electrical power. The essential bus 801PP supplies 28VDC via the circuit breaker 2HV and the selector switch 3HV to the secondary motor of the crossbleed valve. The normal bus 206PP supplies 28VDC via the circuit breaker 1HV, the selector switch 3HV and the crossbleed valve auto control relay 4HV to the primary motor of the crossbleed valve 6HV.
 **ON A/C ALL
 Post SB 21-1121 For A/C 001-049,051-060,101-102,
 The DC electrical system of the aircraft provides the APU bleed-air supply and the crossbleed system with electrical power. The essential bus 801PP supplies 28VDC via the circuit breaker 2HV and the selector switch 3HV to the secondary motor of the crossbleed valve. The normal bus 206PP supplies 28VDC via the circuit breaker 1HV, the selector switch 3HV and the crossbleed valve auto control relay 4HV to the primary motor of the crossbleed valve 6HV. When the crossbleed valve 6HV is not fully open, it sends a signal to the crossbleed relay 7HV.
 **ON A/C ALL
 5. Interfaces
__________
 Signal directions
 -------------------------------------------------------------------------------FROM TO CHAPTER REF. -------------------------------------------------------------------------------APU Pressure and 36-21-00
 Temperature
 Monitoring

 Ducts  Manifold Air 36-22-00 Leak Detec-tion
 6. Component Description
_____________________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 (Ref. Fig. 008)
 1EFF : ALL 1 36-12-00Page 26 1 1 Aug 01/05R 1 1 1CES 1

 APU Bleed Load Valve
 Figure 008

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 36-12-00Page 27 1201-210, 1Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 211-299, 301-399, 401-499,

 (Ref. Fig. 008A)
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 (Ref. Fig. 009)

R **ON A/C 106-149, 211-299, 301-399, 401-499,
　
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