J. Oil (Ref. 49-90-00) The APU oil system lubricates and cools the power section, load compressor, gearbox and AC-Generator. This system is made up of:
 -
an integral wet-sump lubrication system with an APU mounted oil cooler,

 -
an oil level, high oil temperature and low oil-pressure monitoring

 system. The Electronic Control Box (ECB) 59KD monitors these parameters.
 4.
 Power Supply

____________
 (Ref. Fig. 007)

 5.
 Interface

_________
 A. Fuel Supply Fuel is supplied to the APU by the A/C APU fuel supply system (Ref. 28-22-00 and 28-29-00).
 B. Pneumatic Power Pressurized air generated by the APU is fed into the A/C pneumatic power distribution system (Ref. 36-12-00).
 C. APU Fire Protection The APU and most of its peripheral subsystems are installed in the APU compartment, a designated fire zone. This compartment therefore is equipped with a fire detection (Ref. 26-13-00) and fire extinguishing system (Ref. 26-22-00).
 D. Electrical Power The APU is equipped with a 110VAC electrical power generator, which feeds into the A/C electrical power distribution system (Ref. 24-23-00).
 6. Operation/Control and Operation
_______________________________ The APU system operates independently of the other engine systems, in the conditions of operation shown below:

R **ON A/C 001-003, 051-099,
 A. Normal Conditions of Operation (APU not essential)
 (Ref. Fig. 008)

 (1) Ground Operation.
 The APU will:

 -supply bleed air for the Main Engines Start (MES) on the ground in an altitude range between -305 m (-1000 ft.) and +2800 m (9200 ft.) at -40 DEG C to +55 DEG C (-40 DEG F to +131 DEG F),

 Auxiliary Power System - Power Supply
 Figure 007 (SHEET 1)

 CES

 Auxiliary Power System - Power Supply
 Figure 007 (SHEET 2)

 CES

 Auxiliary Power System - Operating Envelope
 Figure 008 (SHEET 1)

 CES

 Auxiliary Power System - Operating Envelope
 Figure 008 (SHEET 2)

 CES  CES  CES

 - supply bleed air for the air conditioning of the cabin and the cockpit, - supply shaft power to a 90 kVA generator together with the conditioning, if necessary.
 (2) Flight Operation. The APU will:
 - supply bleed air in flight up to an altitude of 6096 m (20000 ft.), - supply shaft power to a 90 kVA generator. If an increase in input to the aircraft systems is necessary, the supply of the electrical power has priority over the supply of bleed air.
 (3) An electric DC motor starts the APU: - in ground operation conditions, the APU is started by the aircraft batteries or Transfomer Rectifier Unit (TRU) or a combination of both, - a start in flight is possible up to an altitude of 11900 m (39000 ft.) with the use of TRUs. A start in flight is possible up to an altitude of 7630m (25000 ft.) with the use of the aircraft batteries only. 
R  **ON A/C 401-499, 
R R  A. Normal Conditions of Operation (APU not essential) (Ref. Fig. 008A) 
R R  (1) Ground Operation. The APU will: 
R R R R R R R  - supply bleed air for the Main Engines Start (MES) on the ground in an altitude range between -305 m (-1000 ft.) and 2800 m (9200 ft.) at -40 DEG C to +55 DEG C (-40 DEG F to +131 DEG F), - supply bleed air for the air conditioning of the passenger compartment and the cockpit, - supply shaft power to a 90 kVA generator while the air conditioning is necessary. 
R R  (2) Flight Operation. The APU will: 
R R R R R  - supply bleed air in flight up to an altitude of 6096 m (20000 ft.), - supply shaft power to a 90 kVA generator. If an increase in input to the aircraft systems is necessary, the supply of the electrical power has priority over the supply of bleed air. 

R R R R R R R R  (3) An electric DC motor starts the APU: - in ground operation conditions, the APU is started by the aircraft batteries or Transfomer Rectifier Unit (TRU) or a combination of both, - a start in flight is possible up to an altitude of 12130 m (39800 ft.) with the use of TRUs. A start in flight is possible up to an altitude of 7630m (25000 ft.) with the use of the aircraft batteries only. 
R  **ON A/C 001-003, 051-099, 401-499,
 B. Operation in Icing Conditions The APU will safely operate in ground icing conditions and during a subsequent flight in icing conditions, with it operating as an essential unit. It can be started in climb and flight after APU operation in icing conditions on the ground.
 C. Control and Monitoring The ECB 59KD controls and monitors the APU operation. The Built-In Test Equipment (BITE) of the ECB is connected to the CFDS (Ref. 31-32-00). The components that control and monitor the system are divided into two interfaces:
　
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