DOC AIRBUS | AMM A320FOIL INDICATING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
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 sensor 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:
** ON A/C NOT FOR ALL 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 sensor 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. AMM D/O 31-60-00-00),
- the Central Fault Display System (CFDS) (Ref. AMM D/O 31-32-00-00).
- the APU page on the lower ECAM display unit,
- the APU DATA/OIL page on the MCDU.
2. Component Location
** ON A/C NOT FOR ALL 
Oil Quantity - Component Location| ------------------------------------------------------------------------------- |
| FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA |
| | | | | DOOR | REF. |
| ------------------------------------------------------------------------------- |
| 8089KM SENSOR - OIL LEVEL 316 316AR 49-93-17 |
3. System Description
A. Oil Indication System
(1) The primary component of the oil indicating system is the oil level sensor. It is installed at the right side of the accessory drive gearbox. The sensor stays up into the oil in the integral oil reservoir and monitors the oil level in static condition (the APU does not operate). The sensor transmits the low oil-quantity signal to the ECB 59KD, if the oil quantity is at or below the set minimum of oil level. The set minimum agrees with the ADD mark on the oil sight glass on the gravity oil fill-port.
4. Interface
The Oil Indicating system has interface with:
** ON A/C NOT FOR ALL The Oil Indicating system has interface with:
- the APU Control and Monitoring System (Ref. AMM D/O 49-61-00-00),
- the Storage and Distribution System (Ref. AMM D/O 49-91-00-00).
5. Component Description
A. Oil Level Sensor
The sensor is a Resistance Temperature Detector (RTD) type. The sensor is supplied by the ECB with a constant current of 75 mA. The resistance varies with the oil level and modifies the sensor output voltage. The ECB receives this output voltage and sends a warning signal to the EIS if low oil level condition is available.
The sensor is a Resistance Temperature Detector (RTD) type. The sensor is supplied by the ECB with a constant current of 75 mA. The resistance varies with the oil level and modifies the sensor output voltage. The ECB receives this output voltage and sends a warning signal to the EIS if low oil level condition is available.
6. Operation/Control and Indicating
The oil level sensor is energised and the output voltage is observed during a period of 8 seconds after ECB power-up. If the voltage differential exceeds a certain limit the oil level is too low. When the EIS receives the low oil level signals it automatically shows the APU system page with the advisory 'LOW OIL LEVEL' on the lower ECAM display unit.
When you enter the CFDS, the MCDU shows on the APU DATA/OIL page the status of the oil level.
This occurs when the aircraft is on ground and APU not running.
The following schedule shows the amount of oil in the gearbox at the
*
These values are determined for A/C ground condition. The values can vary in relation of the different operating attitudes of the A/C in flight.
The oil level sensor is energised and the output voltage is observed during a period of 8 seconds after ECB power-up. If the voltage differential exceeds a certain limit the oil level is too low. When the EIS receives the low oil level signals it automatically shows the APU system page with the advisory 'LOW OIL LEVEL' on the lower ECAM display unit.
When you enter the CFDS, the MCDU shows on the APU DATA/OIL page the status of the oil level.
This occurs when the aircraft is on ground and APU not running.
The following schedule shows the amount of oil in the gearbox at the
- FULL-,
- ADD-,
- Low Oil Quantity (LOQ)-,
- Low Oil Pressure (LOP)-,
condition of the APU:
| FULL ............ 5.43 l (1.44 USgal) |
| ADD ............. 3.95 l (1.05 USgal) |
| LOQ ............. 3.95 l (1.05 USgal)* |
| LOP ............. 3.05 l (0.81 USgal)* |
*
These values are determined for A/C ground condition. The values can vary in relation of the different operating attitudes of the A/C in flight.