[Roger]

1980 H.

Quick overview:
Gear goes down fine, and all door close. Gear goes up fine but doors will not close BUT if you shut off the master once the gear is up, then turn the master back on, the doors will then close.

We have checked the switches on the mains. They are closed with the gear being held up buy pressure, and still closed when the master is turned off, pressure is released, and gear falls into the locks.

Nose gear is up, and switch is closed. However when the master is turned off the up lock releases and the nose gear falls. Then when you turn the master back on the nose gear goes back up, and this time all the doors close.

So I would assume that the issue here is that when the master switch is on with the gear handle up, there is pressure to the uplock on the nose gear. Then when the master is turned off, the presure is released from the nose uplock, which allows it to fall against the gear doors, should you have an electrical outage that requires you to hand pump the gear?

So the question is, why do the gear doors only close when you have first cycled the gear up, then with the gear selector still in the up position, you turn off the master, turn it back on, and the doors close.

The only other strange thing is that the Gear in transit light seems sporadic. Does that switch/circuit somehow direct the doors? If so, why then would it work after you release the pressure with the master, then hit it again.

Any help would be greatly appreciated.

tks/Roger