Proximity Switch Electronic Unit
Some of the systems that the PSEU controls are:
- Landing gear position indication and warning
- Take-off warning
- Air/Ground Relays
- Engine Control
- Stall Warning
- Anti-ice
- Cabin pressurisation
The PSEU monitors the following:
- Air/Ground sensing
- Landing gear
- Take/off and landing config warnings
If a PSEU fault is detected or an over wing exit flight lock fails to disengage when commanded the PSEU light and overhead annunciation will illuminate. For other simple faults the same will happen, but only after landing.
The lights will extinguish when parking break is set or both engines are turned off.
PSEU fault light is inhibited:
- Thrust levels are advanced to takeoff power
- In Flight
- 30 seconds after landing