OIL QUANTITY INDICATING SYSTEM - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General

A. Oil Quantity Transmitter

Oil Quantity Transmitter Location ** ON A/C NOT FOR ALL

(1) The oil quantity transmitter is located in the oil tank.

(2) The system is supplied with 28VDC from busbar 101PP through circuit breaker 1EN1 (1EN2).

B. Description :
The oil quantity transmitter is a tank probe with a capacitor (tube portion) and an electronic module (on the top of the transmitter) for probe energizing and signal output.

C. Specification:

Output voltage : 1VDC to 9VDC varying linearly with the usable oil quantity from 0 to 25.8 quarts.

NOTE: When the output voltage is less than 0.9 VDC or greater than 9.1 VDC, the oil quantity indication is replaced by amber crosses.

33 K OHMS less than charge impedance less than 100 k OHMS
Accuracy : plus or minus 0.5 to plus or minus 0.6 US quarts.

D. Oil Quantity Indicating

Oil Quantity System ** ON A/C NOT FOR ALL

Oil Quantity Indication ** ON A/C NOT FOR ALL

(1) The analog signal from the oil quantity transmitter is sent to:

the SDAC1
the SDAC2
the EIU which transforms the analog signal into a digital signal.

(2) The DMC's process the information received as a priority order from the EIU's through FWC 1 and 2, SDAC1, SDAC2.

(3) Scale
The oil quantity displayed in green on the ECAM display unit is graduated from:

0 to 27.5 quarts in analog form (the normal max-usable oil quantity in the tank is 25 US quarts, the maximum oil tank capacity is 30.5 US quarts).
0 to 99.9 in digital form.

(4) Advisory level
The oil quantity flashes green when the oil level quantity is lower than or equal to 5 quarts (decreasing) and stop pulsing at 7 quarts (increasing).

(5) Overfilling of the oil tank can be generate an out of range feedback to the EIU. This may result in amber XX's being displayed in place of the oil quantity.

[Rev.10 from 2021] 2026.04.02 06:39:55 UTC