LOW OIL PRESSURE WARNING SYSTEM - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. Low Oil Pressure Switch

Low Oil Pressure Switch ** ON A/C NOT FOR ALL

The low oil pressure switch is installed on a bracket at the top left side of the engine fan case. The low oil pressure switch is connected between the oil supply tube and the No. 4 bearing scavenge tube.
Actuation of the low pressure switch is at 60 psid decreasing pressure.
The set point range is between 45 psi and 75 psi.

** ON A/C NOT FOR ALL

2. Low Oil Pressure Indication (Warning)

Low Oil Pressure Switch Warning ** ON A/C NOT FOR ALL

When the oil pressure drops below 60 psid plus or minus 1 psid (decreasing) the low oil pressure switch closes. As a result of this:

The red MASTER WARN light located on the glareshield comes on.
The audio warning is activated.
The ENG page appears on the lower ECAM display unit:

The oil pressure indication flashes red.

These warning messages appear on the upper ECAM display unit:

ENG1 (2) OIL LOW PRESS*
THROTTLE 1 (2) IDLE*

Activation on the ground of the following circuits:

WN (Emergency Escape Slide Release Warning)*
CC (Engagement and Internal Monitoring)*
CA (Electrical Power Supply).
When the oil pressure reaches 60 psid increasing, the low oil pressure switch opens. As a result of this:

The MASTER WARN light goes off.
The audio warning is deactivated.
The oil pressure is indicated in green.
The warning messages disappear on the upper ECAM display unit.
Inhibition of the following circuits:

WN (Emergency Escape Slide Release Warning)
CC (Engagement and Internal Monitoring)
CA (Electrical Power Supply).

[Rev.10 from 2021] 2026.04.02 06:39:56 UTC