2. System Description
__________________
A. Storage and Distribution The oil storage and distribution system supplies filtered, temperature and pressure regulated oil to:
-
the engine,
-
the APU generator.
The system has:
-an integral oil reservoir (gearbox sump) with an magnetic chip detector,
-a combined pressure and scavenge pump,
-
two oil filters,
-
two differential-pressure indicators,
-an oil cooler assembly,
-a de-oil solenoid,
-an oil-sump temperature sensor.
The gearbox sump is a wet sump which is also the integral oil reservoir.
The generator and the turbine sumps are scavenged sumps. The three sumps
have no direct connection between each other.
B. Oil Indicating The oil indicating system shows you if the oil quantity in the integral oil reservoir in the accessory drive gearbox is sufficient or if an oil servicing is necessary. The ECB 59KD monitors the oil quantity through the low oil level switch in the static condition (when the APU does not operate). The set minimum agrees with the ADD mark on the oil sight glass on the gravity oil fill-port. When the ECB 59KD receives a low-oil quantity signal from the low oil level switch, it transmits the signal to:
-
the Electronic Instrument System (EIS) (Ref. 31-60-00),
-
the Central Fault Display System (CFDS) (Ref. 31-32-00).
You can read the oil quantity information on the EIS and the Multipurpose
Control & Display Units (MCDUs) in the cockpit on:
-
the APU page on the lower ECAM display unit,
-
the APU DATA/OIL page on the MCDU.
C. Low Oil Pressure and High Oil Temperature Warning The low oil pressure and high oil-temperature warning-system together with the ECB 59KD monitor the APU oil pressure and the oil temperature. They also monitor the temperature of the APU generator scavenge oil. The system protects the APU against low oil pressure and high oil temperature. When the ECB 59KD receives the low oil pressure or a high oil-temperature signal, it starts the APU automatic shutdown-sequence (Ref. 49-61-00).
D. Oil Heating An APU oil heater is installed on the APU gearbox. If the power supply to the APU oil heater is installed on the aircraft, the APU oil heater increases the temperature of the oil in the APU gearbox oil reservoir if the oil temperature is too low.
OIL - DESCRIPTION AND OPERATION
_______________________________
1. General
_______ 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.
2. System Description
__________________
A. Storage and Distribution The oil storage and distribution system supplies filtered, temperature and pressure regulated oil to:
-
the APU,
-
the APU generator.
The system has:
-an oil reservoir (gearbox sump) with an magnetic chip detector,
-a lube module,
-
two oil filters,
-
two differential-pressure switches,
-an oil cooler assembly,
-a de-oil solenoid,
-
an oil-sump temperature sensor.
-
an oil heater,
-
a low oil level switch,
-
a low oil pressure switch.
The gearbox sump is a wet sump which is also the integral oil reservoir.
The generator and the turbine sumps are scavenged sumps.
B. Oil Indicating The oil indicating system shows you if the oil quantity in the accessory drive gearbox is sufficient or if an oil servicing is necessary. The ECB 59KD monitors the oil quantity through the low oil level switch in the static condition (when the APU does not operate). The set minimum agrees with the ADD mark on the oil sight glass on the gravity oil fill-port. When the ECB 59KD receives a low-oil quantity signal from the low oil level switch, it transmits the signal to:
-
the Electronic Instrument System (EIS) (Ref. 31-60-00),
-
the Central Fault Display System (CFDS) (Ref. 31-32-00).
You can read the oil quantity information on the EIS and the Multipurpose
Control & Display Units (MCDUs) in the cockpit on:
