FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Prop Clearance Procedure

 
Post new topic   Reply to topic    MaulePilots.Org Forum Index -> Modifications
View previous topic :: View next topic  
Author Message
Andy Young
100+ Posts


Joined: 05 Oct 2011
Posts: 1037
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Sat Apr 06, 2019 5:45 am    Post subject: Prop Clearance Procedure Reply with quote

A friend who is installing a different prop on his plane is looking for some information regarding complying with the clearance check procedure in CAR3. Specifically, he is asking how far the landing gear deflects at full travel. Does anyone here have that information?

Thanks.
Back to top
View user's profile Send private message
Undaunted



Joined: 12 Feb 2014
Posts: 94
Location: Wisconsin

PostPosted: Sat Apr 06, 2019 7:57 am    Post subject: Reply with quote

It might be variable based on day and location.

I know that some days and landings mine deflect a lot more than other days !
😄😄
_________________
1999 M7-235C
Back to top
View user's profile Send private message
andy
Site Admin


Joined: 06 Aug 2007
Posts: 1019
Location: Lake James, NC, USA

PostPosted: Sat Apr 06, 2019 3:38 pm    Post subject: Reply with quote

I'm sure you already know this but here's the regulation.

§23.925 Propeller clearance.

Unless smaller clearances are substantiated, propeller clearances, with the airplane at the most adverse combination of weight and center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:

(a) Ground clearance. There must be a clearance of at least seven inches (for each airplane with nose wheel landing gear) or nine inches (for each airplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal takeoff, or taxing attitude, whichever is most critical. In addition, for each airplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks, there must be positive clearance between the propeller and the ground in the level takeoff attitude with the critical tire completely deflated and the corresponding landing gear strut bottomed. Positive clearance for airplanes using leaf spring struts is shown with a deflection corresponding to 1.5g.

I don't know how far oleo gear deflects at full travel. It sounds like there are several variables: weight, strut travel, tire inflation, attitude.
_________________
Andy
1986 MX7-180
Back to top
View user's profile Send private message Visit poster's website
MauleWacko
100+ Posts


Joined: 05 Dec 2006
Posts: 467

PostPosted: Sun Apr 07, 2019 7:49 am    Post subject: Reply with quote

Sounds like when your friend is done doing the propeller clearance test he will know. If he is just looking for numbers to put down and just guess on it without doing the proper way that the FAA calls for. It should be no surprise why it is getting harder to do any 337's these day's.
If you do what is asked for, there should be no reason for the answer because you will have it when you do the test. Being lazy and taking short cuts in aviation will get you in a grave or an aircraft that is an obvious pile of shit. Shocked
Back to top
View user's profile Send private message
Andy Young
100+ Posts


Joined: 05 Oct 2011
Posts: 1037
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Sun Apr 07, 2019 8:03 am    Post subject: Reply with quote

MauleWacko wrote:
Sounds like when your friend is done doing the propeller clearance test he will know. If he is just looking for numbers to put down and just guess on it without doing the proper way that the FAA calls for. It should be no surprise why it is getting harder to do any 337's these day's.
If you do what is asked for, there should be no reason for the answer because you will have it when you do the test. Being lazy and taking short cuts in aviation will get you in a grave or an aircraft that is an obvious pile of shit. Shocked


Wow, who pissed in YOUR Cheerios this morning?
Back to top
View user's profile Send private message
MauleWacko
100+ Posts


Joined: 05 Dec 2006
Posts: 467

PostPosted: Sun Apr 07, 2019 10:26 am    Post subject: Reply with quote

No cheerios or piss, Just coffee.
Just saying it the way I read it and the way it is, plain and simple.
I posted that when I did the C201. My 337 process was less than two weeks. I also posted Maule was no help in oleo compression measurement. As some has posted it may vary.
So the plain and simple answer your friend is looking for without doing the test will be a guess or lie without doing what is simply asked for by the FAA. When he does the test he will have the answer, plain and simple and the truth.
Cutting corners or half ass way to do things ends up making anything a pile of shit, plain and simple! This would also include paper work. Shocked
Back to top
View user's profile Send private message
Mog
100+ Posts


Joined: 26 Nov 2010
Posts: 588
Location: Dallas, TX

PostPosted: Sun Apr 07, 2019 5:47 pm    Post subject: Reply with quote

Why should he have to reinvent the wheel if someone has the info. It sure seams to me that he was just asking for a small amount of help with the assumption that someone must know the answer. Sure would save him a lot of trouble and should make anyone who helps him feel good about themselves for helping someone out.

I wish I had the answer, I would gladly share it with anyone who asked for it.
_________________
K.C.
Back to top
View user's profile Send private message
Andy Young
100+ Posts


Joined: 05 Oct 2011
Posts: 1037
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Sun Apr 07, 2019 6:05 pm    Post subject: Reply with quote

Thanks Andy,
Thanks Mog,

MauleWacko:
I was just trying to gather a key piece of information so my friend would have the clearest picture possible of what he was likely to find as he went through the process. The A&P/IA who is doing the work/paperwork is not overly familiar with Maules, so he asked me the innocent question of how far that gear deflects. He is an extremely qualified and careful mechanic, and I did not get the impression he was looking to shortcut the process. I think he just wanted as much information as possible going in, as any reasonable person would. When I land in fresh snow, I’m certainly going to find out how deep it is in the process of landing, but if someone has been there before me and can tell me how deep THEY sank in, I’m very glad to have that information beforehand...
Back to top
View user's profile Send private message
gbarrier
100+ Posts


Joined: 14 Jul 2011
Posts: 1350
Location: North Carolina

PostPosted: Mon Apr 08, 2019 12:55 am    Post subject: Reply with quote

I think that most of us here, had they done the research, would share it knowing that they may be in search of something down the road that would be shared with them. It's pretty much a good group. Copies of field approvals (337s) etc. flow freely and that helps everyone.
Back to top
View user's profile Send private message
Mog
100+ Posts


Joined: 26 Nov 2010
Posts: 588
Location: Dallas, TX

PostPosted: Mon Apr 08, 2019 3:37 am    Post subject: Reply with quote

Recent experience does not feel that way to me. I’m not sure why, and it may have been a unique experience. I finally got what I needed by reaching out directly to a few people that had not read my thread. Not sure why people are grumpy at the moment regarding 337’s and such.
_________________
K.C.
Back to top
View user's profile Send private message
Andy Young
100+ Posts


Joined: 05 Oct 2011
Posts: 1037
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Mon Apr 08, 2019 3:48 am    Post subject: Reply with quote

Interestingly, while people are often very guarded with their 337s, they are actually all publicly available. All you have to do is write the FAA and ask for copies of all 337s for a particular N number. Of course, you have to know what’s N number has a 337 for the work you are looking to emulate.
Back to top
View user's profile Send private message
Mog
100+ Posts


Joined: 26 Nov 2010
Posts: 588
Location: Dallas, TX

PostPosted: Mon Apr 08, 2019 6:24 am    Post subject: Reply with quote

Crazy thing is that I now have a handful of 337’s for the C201 and they are all wildly different. Some with restrictions some without. If everyone shared more readily then future applicants can turn in identical paperwork which helps reduce the variables and keeps the feds happy. Having imported lots of vehicles and dealing with communities of people aspiring to do the same I find that the ones that go it alone tend to mess up the paperwork often and throw up red flags for others to import later. Land Rovers to one of the biggest hits not long ago for fraudulent imports, and Unimog’s get hit with non AG tax often because of some careless importers.
_________________
K.C.
Back to top
View user's profile Send private message
MauleWacko
100+ Posts


Joined: 05 Dec 2006
Posts: 467

PostPosted: Mon Apr 08, 2019 6:36 am    Post subject: Reply with quote

The key information is when the test was done for the aircraft getting the c201 installed. As mentioned they are different, so without doing it you would not have the correct number.
When I did mine all I did was follow the instructions asked in the CAR. That information will vary between aircraft. The only way to have the number is to just do it. I did not need any copies or any other numbers from any other aircraft. Just do what is asked and show what they asked and two weeks later I was flying.
All the information is public. Most of it has been posted at some point of time. I have given mine out several times and do not have it anymore. The prop was removed from the plane I sold it and the paper work stayed with the prop. The paper work was the easy part. The hard part was the amount of money it took to buy the propeller. You have to have the right spinner and governor for it also. After removing the C201 I found out the cost did not make up for the short wing on the M-4. Shocked
Back to top
View user's profile Send private message
gbarrier
100+ Posts


Joined: 14 Jul 2011
Posts: 1350
Location: North Carolina

PostPosted: Mon Apr 08, 2019 4:07 pm    Post subject: Reply with quote

Like Andy said, it’s all available if you know the tail number. Just go online to the FAA website and request (actually buy for $10 with your favorite credit card) a CD. Gives you all 337s and registrations. It’s also a good idea as part of any pre purchase.
Back to top
View user's profile Send private message
crbnunit
100+ Posts


Joined: 18 Mar 2008
Posts: 1758
Location: Alaska

PostPosted: Tue Apr 09, 2019 7:11 am    Post subject: Reply with quote

We tried to start a 337 library here not long ago. There was a big outcry from a couple of folks and it stopped. I really don't see the problem. They are just used to give your mechanic a place to start so he/she doesn't have to make one from scratch. Is there something I'm missing here?
_________________
You have to make up your mind about growing up and becoming a pilot. You can't do both!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    MaulePilots.Org Forum Index -> Modifications All times are GMT - 10 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group
Site design by BackcountryPilot.Org