Airbus nose gear - Typically how long in air after main gear touchdown?
This is from an engineer. The aircraft type I’m working on, an Airbus, has thrust reversers which are able to deploy as soon as the main landing gear touches down. That’s normal so far. Thrust reverser deployment inflight is clearly undesirable, and the aircraft will produce alerts if any part of the TRU system becomes “unlocked” in flight. Unfortunately, the alert logic considers “on ground” to mean main landing gear and nose gear on ground.
You may already have guessed the issue here. Upon landing, the main gear touches down first and the thrust reversers deploy, but as the nose gear is still airborne, the alert logic considers the aircraft airborne and spews out unwanted TRU unlocked in flight messages, every single landing.
The way to stop this is to tweak the alert software to delay the unwanted alert until the nose gear has touched down and the aircraft is “on ground”.
Is there any sort of guidance as to the maximum time the nose gear can be airborne after the main landing gear has touched down? A piece of string question perhaps, but it’s for a valid reason as is hopefully explained above. Many thanks for any input.