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Gear Up Problems

Posted: Tue Oct 20, 2020 1:17 pm
by bjoar-b
Hi!

I got snag on the gear up circuit, no response when selecting gear up. I have checked the gear up relay, and it’s working fine so no trouble on that.

So, the snag has to be from the gear handle to the relay. No response in flight, and no response on jacks even when I put a jumper to go around pitot pressure switch.

Have anyone some ideas regarding this problem?

Regards.
Bjørn Brekke
Falco 1487 LN-LOB

Gear Up Problems

Posted: Tue Oct 20, 2020 4:47 pm
by flysavvy_
Bjørn, just to confirm, there are two terminals at the pitot pressure relay, can you confirm you jumped to the correct one?

One would jump the relay, while the other would go to the indicator or switch in the cockpit.

There's always the chance of a broken wire, but otherwise I would expect the issue to be your up-limit switch or selector switch.

Gear Up Problems

Posted: Wed Oct 21, 2020 12:30 pm
by Alfred Scott
Electrical problems are always mechanical problems. I suspect a loose connection.

The only way to diagnose a problem with the retraction system is to use the gear logic drawings and trace things down.

Let me also mention that the forum has now been hit by spam, so we have changed it so your first two posts will have to be approved by a moderator, then it will be an open road for you thereafter.

Alfred

Gear Up Problems

Posted: Sun Oct 25, 2020 8:15 pm
by NE Falco
Bjorn,

I had a very similar issue with my gear a few months back. It turned out to be the gear system transistor (Q3). Replaced the transistor, trouble free ever since. Ref: Falco Electrical System, Pg. 9-7, Fig. 9-7. Also see Falco Construction Drawings, Sheet A39 and Sheet A43, Detail A.

It only affected gear retraction, the gear came down normally.

I hope this helps.

George

Re: Gear Up Problems

Posted: Wed Mar 10, 2021 2:32 pm
by Dvale
Also had a problem with the transistor. Replaced and all well - now keep a spare as they cost next to nothing. I always make sure when doing a ground test on jacks the battery is connected to a charger. It means the Bus voltage is normal in flight voltage and ensures the correct voltage for the transistor to do its stuff.