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klr12(at)psu.edu
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 Posted: Wed Aug 29, 2007 5:00 am Post subject: Mount Bolts |
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Don,
Firewall forward gets friction locks, firewall aft gets fiber locks,
But don't take my word for it. Here it is straight from the horse's mouth.
Kevin R.
XL/C
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed Aug 29, 2007 6:14 am Post subject: Mount Bolts |
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The question is, do these nuts in the location where they are installed ever exceed 250°F. These nuts are installed at the remote corners of the firewall in direct contact with the metal airframe. In order for the temperature of these nuts to exceed 250°F, the entire firewall, engine mount and airframe sections in direct contact with these nuts would have to exceed 250°F. I don't believe that is the case. I've never burned myself by touching the firewall or anything directly attached to it immediately after a fight and the plastic overflow tank mounted on the firewall has never shown any signs of heat damage. There's just too much metal wicking away the heat for it to build up to that high a temperature. As long as the nuts themselves do not exceed the temperature limit, there should be no problem in using them. There is no statement in the text you quoted that forbids using nylon locking nuts forward of the firewall. That being said, I would certainly not use them on the engine itself.
On Aug 29, 2007, at 8:59 AM, Kevin L. Rupert wrote:
| Quote: | Don,
Firewall forward gets friction locks, firewall aft gets fiber locks, But don't take my word for it. Here it is straight from the horse's mouth.
Kevin R.
XL/C<Chapter 07.pdf>
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--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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klr12(at)psu.edu
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| Posted: Wed Aug 29, 2007 7:09 am Post subject: Mount Bolts |
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Bryan,
I agree that the nuts will never see the 250 degrees, but I work on
planes for a living and in our shop, friction lock go in the engine
compartment. I don't like questions from the FAA inspector, when he
comes around.
Kevin R.
XL/C
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n4546v(at)mindspring.com
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| Posted: Wed Aug 29, 2007 7:40 am Post subject: Mount Bolts |
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We are just finishing a major overhaul of a O-200Aand the manual specifies
fibre lock nuts for installing accessories such as starter & generator
directly on the engine accessory case.
How do you reconcile the fact that Continental specifies them?
Regards,
Randy, Las Vegas do not archive
Subject: Re: Mount Bolts
| Quote: |
Bryan,
I agree that the nuts will never see the 250 degrees, but I work on
planes for a living and in our shop, friction lock go in the engine
compartment. I don't like questions from the FAA inspector, when he
comes around.
Kevin R.
XL/C
|
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed Aug 29, 2007 8:33 am Post subject: Mount Bolts |
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I specifically asked my DAR about these nuts and he said if the designer specified those nuts at that location, he was OK with it.Of course, with an E-AB, we're not bound by factory-built rules. I do generally follow standard aircraft practices in most cases though.
On Aug 29, 2007, at 11:09 AM, Kevin L. Rupert wrote:
| Quote: | --> Zenith-List message posted by: "Kevin L. Rupert" <klr12(at)psu.edu (klr12(at)psu.edu)>
Bryan,
I agree that the nuts will never see the 250 degrees, but I work on planes for a living and in our shop, friction lock go in the engine compartment. I don't like questions from the FAA inspector, when he comes around.
Kevin R.
XL/C
|
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
[quote][b]
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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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klr12(at)psu.edu
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| Posted: Wed Aug 29, 2007 10:01 am Post subject: Mount Bolts |
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Randy,
I'd say you have an aftermarket maintenance manual. All my TCM manuals
show either friction lock, running nut with star lock washer, running
nut with palnut, or castle nut with cotter pin. I have installed a lot
of starters and generators on Continentals in my time and I have never
used a fiber lock on any of them. Maybe your FSDO will buy fiber locks
in the engine compartment, Mine won't, and as I said before I don't
argue with the FAA. They always win.
Kevin R.
XL/C
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n4546v(at)mindspring.com
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| Posted: Wed Aug 29, 2007 11:47 am Post subject: Mount Bolts |
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Kevin:
I'm at work now so I don't have the reference in front of me, but I will
double-check. It is not a maintenance manual, it is the Continental
overhaul manual.
More to come......
Randy, Las Vegas do not archive
Subject: Re: Mount Bolts
| Quote: |
Randy,
I'd say you have an aftermarket maintenance manual. All my TCM manuals
show either friction lock, running nut with star lock washer, running
nut with palnut, or castle nut with cotter pin. I have installed a lot
of starters and generators on Continentals in my time and I have never
used a fiber lock on any of them. Maybe your FSDO will buy fiber locks
in the engine compartment, Mine won't, and as I said before I don't
argue with the FAA. They always win.
Kevin R.
XL/C
|
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