Hi buddy what is you question ?
Do you want to get in touch with some engeneer about SF260?
As pilot I flew around 200 hrs on sf 260 never heard about that .

Power is supplied to the landing gear actuator by two solenoids, one for each direction of movement. It's my bet that the "up" solenoid has failed in the closed sense so it is continually supplying 28v to the actuator. You can test that by checking that there is no voltage being supplied to the solenoid when the aircraft on the ground with the weight on the main wheels so the squat switch is closed.

Try to contact the factory , Siai has been rebranded Leonardo.

[email protected]

SF-260 - DETTAGLIO - Leonardo - Finmeccanica

Hi mate,

As far as I remember the SF260F has got an uprated engine and a fuel injection system, but all the rest is as per "main project", landing gear system included.
I don't think there are any SF260F flying in Italy at the moment, and anyway, as Ramones already said, I'm not aware of any potential defect regarding the landing gear system on model A to C (should be the same landing gear system as model F).
Could be than an issue directly connected with your own model? pretty sure the factory can help you out if you contact them as Nick suggested.

sf 260 landing gear
 

Hi,

With regards to the landing gear of the sf260. Aside from the solenoids you mentioned earlier. Do you have any other knowledge if what might have caused this unusual retraction of either the nose wheel or one of the main wheel while on the ground? It occured in two instances in different aircraft. The first one is during landing roll and the other is during engine starting. Thank you.

If it is not electrical, then it looks like the adjustment of the actuating rods for the legs. You have to adjust their lengths properly so the internal springs have the correct pre-load which ensures a positive lock for each leg when it reaches the down position. I haven't got my maintenance manual with me, but I think it is a minimum of 0.25ins of residual stroke left when the legs are in the locked down position (check the manual). A big tip when checking the gear operation with the aircraft on jacks is to always apply the specified load on the nose leg to simulate air loads, I use a length of wire with a spring balance...you need a helper to do do that!