W DOC AIRBUS | AMM A320F

OIL QUANTITY INDICATING SYSTEM - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL
1. General
A. Oil Quantity Transmitter
F Oil Quantity Transmitter Location ** ON A/C NOT FOR ALL
F Oil Quantity Transmitter Installation ** ON A/C NOT FOR ALL
F Oil Quantity Transmitter Block Diagram ** ON A/C NOT FOR ALL
F Oil Tank Volume Calibration ** ON A/C NOT FOR ALL
  • The oil quantity transmitter is located in the oil tank.
  • The system is power supplied with 28VDC from busbar 101PP (202PP), through circuit breaker 2EN1 (2EN2).
  • The oil quantity transmitter probe (tube portion) is a capacitor formed by two concentric tubes. The inner tube is profiled to achieve a linear output in a non-linear tank. The signal from this capacitor is rectified and sent to the electronics assembly on top of the transmitter.
  • Transmitter specification:
    Output voltage: 1VDC to 9VDC varying linearly with true oil quantity from 1.4 to 24 quarts
    charge impedance: 33 K ohms < charge impedance < 100 K ohms
    Accuracy: plus or minus 0.5 quarts
B. Oil Quantity Indicating
F Oil Quantity Indication ** ON A/C NOT FOR ALL
F Oil Quantity System ** ON A/C NOT FOR ALL
  • The analog signal from the oil quantity transmitter is sent to :
    the SDAC 1
    the SDAC 2
    the EIU which transforms the analog signal into a digital signal.
  • The DMCs process the information received as a priority order from the SDAC 1, SDAC 2 and EIU through FWC 1 and 2.
  • Scale:
    The oil quantity displayed in green on the display unit of the ECAM system is graduated:
    from 0 to 22 quarts in the analog form
    from 0 to 99.9 in the digital form.
  • Advisory level
    The oil quantity flashes green when the oil level quantity is lower than 3 quarts (decreasing) and stops pulsing at 5 quarts (increasing).
[Rev.10 from 2021] 2026.04.01 13:09:36 UTC
"Aviabrain" 2025