Formsprag clutch

Service and maintenance tips, questions, and issues.

Moderator: Ron Spiker

Re: Formsprag clutch

Postby Ron Spiker » Fri Apr 30, 2010 8:18 am

Thanks for your input Jason. Now the question still is, where can we go for the formsprag inspections? Who does them? Can they be inspected by our local A&P, looking for some amount of wear or play or whatever. If so, is there any documentation he could use to do this inspection? If the factory and Formsprag neither one will do the inspections, do we then end up with a 600 hour clutch instead of 2500 hour?
User avatar
Ron Spiker
Site Admin
 
Posts: 527
Joined: Sat Mar 22, 2003 5:33 pm
Location: Pittsburgh, PA

Re: Formsprag clutch

Postby JasonTX » Fri Apr 30, 2010 8:29 am

Ron Spiker wrote:Thanks for your input Jason. Now the question still is, where can we go for the formsprag inspections? Who does them? Can they be inspected by our local A&P, looking for some amount of wear or play or whatever. If so, is there any documentation he could use to do this inspection? If the factory and Formsprag neither one will do the inspections, do we then end up with a 600 hour clutch instead of 2500 hour?


Unfortunatly we don't have the capability at the moment to do any type of inspections. What we are trying to do is have some of our document shipped back to us from China so we can do further research on this. We are hoping to find the original project data from when the CL40237 was approved and all the stipulations. Hopefully it will detail the inspection process and maybe even something to start the process of proving that the inspection should be increased to more than 600 or at least give us something to work with so that we can see if the FAA would approve this to be done in the field by an A&P.
JasonTX
 
Posts: 17
Joined: Wed Mar 30, 2005 10:30 am

Re: Formsprag clutch

Postby bryancobb » Fri Apr 30, 2010 8:31 am

If the -2's and -3's can use the 600 hour time, that's GOOD for everybody!
YHO-3BR Pilots International
User avatar
bryancobb
 
Posts: 285
Joined: Thu Feb 27, 2003 8:23 pm
Location: Cartersville, Georgia

Re: Formsprag clutch

Postby seneca2e » Fri Apr 30, 2010 8:47 am

Also one could infer that there was three iterations-the original Cl40237, then the -2, then the -3. The -2 and -3 appear to have 600 hour inspection intervals.
seneca2e
 
Posts: 389
Joined: Mon Feb 11, 2008 10:35 pm

Re: Formsprag clutch

Postby Ron Spiker » Fri Apr 30, 2010 8:54 am

Unfortunatly we don't have the capability at the moment to do any type of inspections. What we are trying to do is have some of our document shipped back to us from China so we can do further research on this. We are hoping to find the original project data from when the CL40237 was approved and all the stipulations. Hopefully it will detail the inspection process and maybe even something to start the process of proving that the inspection should be increased to more than 600 or at least give us something to work with so that we can see if the FAA would approve this to be done in the field by an A&P.


This is good to hear, but too bad that it's taken this long to get to this point. I know that I myself have called several times over the past 1-2 years asking about this very topic, and what we as owners were supposed to do. Please let us know as you find out more information.
User avatar
Ron Spiker
Site Admin
 
Posts: 527
Joined: Sat Mar 22, 2003 5:33 pm
Location: Pittsburgh, PA

Re: Formsprag clutch

Postby J-nut » Sun May 02, 2010 4:15 pm

Well rats, from my spreadsheet it appears I have CL40237-basic. I looked at the unit but couldn't find the part #. Serial # is 0096 so I'm guessing this is from before the -2 or -3. Bummer - :cry:
Semper ubi sub ubi
J-nut
 
Posts: 79
Joined: Sat Jan 31, 2004 5:23 pm
Location: Seattle, WA

Re: Formsprag clutch

Postby seneca2e » Tue May 04, 2010 12:01 pm

Formsprag is in contact with the Brantly factory and seems willing to do the inspection. The units must be sent back to Brantly though and hopefully that gets worked out to the benefit of all owners. I'm not so worried about dotting every i or crossing every t as I am having faith that the overunning clutch is in good operating condition!
seneca2e
 
Posts: 389
Joined: Mon Feb 11, 2008 10:35 pm

Re: Formsprag clutch

Postby 9121u » Fri May 07, 2010 8:25 pm

My opinion on the sprag clutch is on till they get something going for inspection and you have a good working an the time isn't up yet. is to grease it every 10 or 15 max hours of run time. not 25 hrs the reason is. ever see where that grease comes from that's on the fire wall guess where it came from that's right the sprag clutch. because it gets so hot. and flies out. so keep em greased and i don't see a problem. its like an old tractor keep it greased it never wears . out. that's how Robinson can put 2200 hrs on there parts on there helicopters they have sealed bearings grease cant come out and wear out. grease is cheap sprag clutch is not. nor is a crashed helicopter.so lets be safe about it. my thoughts thanks tom
9121u
 
Posts: 254
Joined: Sat Mar 29, 2003 6:20 pm

Re: Formsprag clutch

Postby bryancobb » Sat May 08, 2010 5:56 am

JUST KEEP IN MIND 21U, YOUR GOOD GREASE JOB IS ONLY AS GOOD AS THE MOST NEGLIGENT OWNER AFTER THE CURENT CLUTCH WAS INSTALLED!
YHO-3BR Pilots International
User avatar
bryancobb
 
Posts: 285
Joined: Thu Feb 27, 2003 8:23 pm
Location: Cartersville, Georgia

Re: Formsprag clutch

Postby N2285U » Mon Nov 15, 2010 8:06 am

So what is the latest on this? If a current -2 has 450 hours on it does it turn into a pumpkin in 150 hours?
If your wings aren't turning, they are broken and you had better get them fixed....
N2285U
 
Posts: 80
Joined: Wed Mar 26, 2003 10:34 pm
Location: Auburn, IN

Re: Formsprag clutch

Postby bryancobb » Mon Nov 15, 2010 2:09 pm

85U,
To my knowledge, there has been NO revision of service life since the Type Certificate was issued in the early '90's I think.
According to that, the dash two indeed turns into a pumpkin at 600.

It MUST be remanufactured at that time. Now if you can get your hands on a clutch that has a yellow tag that shows TIME SINCE LAST REMAN at less than than 600, it's airworthy. If I rember right, after 1200, it cannot be rebuilt. Maybe that's at 2500 ??

Harold usually has one or two that's airworthy. Last one I installed was a brand new dash THREE from him? Where that one came from, no-one knows, but it was a beauty, and it's a 1200 hr part.
YHO-3BR Pilots International
User avatar
bryancobb
 
Posts: 285
Joined: Thu Feb 27, 2003 8:23 pm
Location: Cartersville, Georgia

Re: Formsprag clutch

Postby seneca2e » Thu May 05, 2011 11:12 pm

Birddog,
How about contacting Formsprag and getting them to do this clutch inspection/rebuild? I went as far as I could and the guys at Formsprag were helpful but would not proceed without the factory getting involved(which basicly would have acted as a middleman) but the factory did not contact them. I still wonder how those last few ships were built since Formsprag had not built any new clutches for many, many years. NOS I guess.
Last edited by seneca2e on Sun May 08, 2011 8:39 pm, edited 1 time in total.
seneca2e
 
Posts: 389
Joined: Mon Feb 11, 2008 10:35 pm

Re: Formsprag clutch

Postby scrapper » Sun May 08, 2011 7:24 pm

You all probably know this, a consistency I pick up as I investigate the Brantly
fits 100% with Bryan's comment "JUST KEEP IN MIND , YOUR GOOD GREASE JOB IS ONLY AS GOOD AS THE MOST NEGLIGENT OWNER AFTER THE CURENT CLUTCH WAS INSTALLED!" Humanity sure varies, most couldn't even imagine not sticking to a solid grease schedule, I think Tom does it at 15hrs, vs the usual 25, but I bet some just start her up and fly, like their car with 8k miles on the oil. lazy.
COF
Scrapper
scrapper
 
Posts: 111
Joined: Thu Nov 11, 2010 7:25 am

Re: Formsprag clutch

Postby G-ATLO » Thu Jan 11, 2018 10:57 am

Was the Form sprag issue ever solved or am I also scrapping my Brantly in 100 hours? Any answers would be appreciated as I think there are only a couple of Brantlys left here in the UK now ,would love to keep it going.
User avatar
G-ATLO
 
Posts: 39
Joined: Fri Jun 27, 2003 2:49 pm
Location: United Kingdom

Re: Formsprag clutch

Postby bryancobb » Thu Jan 11, 2018 5:32 pm

Last I heard, Gary Goldsberry had some autorotation clutches that are serviceable.
YHO-3BR Pilots International
User avatar
bryancobb
 
Posts: 285
Joined: Thu Feb 27, 2003 8:23 pm
Location: Cartersville, Georgia

PreviousNext

Return to Servcing and Maintaining

Who is online

Users browsing this forum: No registered users and 1 guest

cron