Gear Lock Switches

Dale Campbell · #1 03-16-10, 08:44 AM

Hi guys,
Has any one found a outlet for the down lock switches for landing gear. My 337H gear is failing again to close doors after gear is down and locked in position. It takes 4 tries before the doors close and green light comes on. My main gear down lock switch number is S2088-1 and the nose gear switch is S1377-1 according to my parts book. I priced them at the shop that does repair and they quoted $736.00 for the 3 micro switches. The switches are like the ones I used on computers 20 years ago that cost $2.00 each. Thanks for any help, Dale Campbell

Roger · #2 03-16-10, 10:22 AM

I can't imagine that all of these switches are bad unless soemthing happened to the plane, like it was sitting in salt water for a few years. Pop the swithces off, and clean them well with an electronics cleaner, and ohm test them. One hours work on these will save you a few grand.

Ernie Martin · #3 03-16-10, 10:28 AM

If cleaning doesn't work, try Preferred Airparts at 800-433-0814 (www.preferredairparts.com). The S means it's a standard part used in many aircraft, and Preferred buys the inventory of out-of-business airplane dealers and FBOs. If Preferred doesn't have it, Google it to see if anyone else does.

Ernie

Dale Campbell · #4 03-16-10, 03:44 PM

Thanks guys,
The micro switches are sealed plastic and can not be taken apart or I would take that effort and clean them. I contacted Preferred Airparts and can get the s2088-1 for $95.40 each which is $127.20 cheaper for the pair. Thanks again, Dale

Roger · #5 03-16-10, 05:48 PM

Cool. Can you send me your old ones ?

#6 03-17-10, 01:20 AM

Hi,
I'm not up on the H models, but on the B models there is a microswitch on the powerpack that will cause this exact problem. Either replace the switch, which is about 25 dollars or try cleaning it with electrical contact cleaner.

Dale Campbell · #7 03-17-10, 08:37 AM

Ok Roger,
When I get the new ones, I will let you know when they get installed. I will also check out that switch on power pack. Thanks Guys, Dale

Kim Geyer · #8 03-17-10, 08:04 PM

The H model doesn't have a switch on the power pac The switches on the mains are the cheap ones, the one on the nose gear is @ $450.00. We just had a wire break on an uplock switch, the pilot wasn't paying attention and fried the power pac motor. You may also want to check the switch rigging making sure it's compressing