W DOC AIRBUS | AMM A320F

OIL QUANTITY INDICATING SYSTEM - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL
1. General
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
A. Oil Quantity Transmitter
  • 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 shaped to achieve a linear output in a non-linear tank. The signal from this capacitor is rectified and goes to the electronics assembly on top of the transmitter.
  • Transmitter specification :
    Output voltage : 1VDC to 9VDC varying linearly with true oil quantity from 0 to 5.45 USgal (0 - 20.62 l)
    Charge impedance : 33 Kohms < charge impedance < 100 Kohms
    Accuracy : plus or minus 0.12 USgal (0.47 l)
B. Oil Quantity Indicating
F Oil Quantity - Indicating Principle ** ON A/C NOT FOR ALL
F Oil Quantity System - Schematic ** ON A/C NOT FOR ALL
F Oil Quantity Indicating on the ECAM 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 the FWC 1 and 2.
  • Scale :
    The oil quantity displayed in green on the display unit of the ECAM system is graduated :
    from 0 to 5.50 USgal (0 - 20.81 l)
  • 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 03:39:28 UTC
"Aviabrain" 2025