Early 337 rear engine screens

[billsheila]

The problem appears to be caused by vibration. My A/P says if we could find some similar screening (he says welded at joints would be an improvement) he could replace it and sign off on the alteration. But it "will be a project" to use his words, which is code for "get out the wallet". He says removal is an option as well, so your post is exactly right I think.

[tropical]

Originally Posted by billsheila

The problem appears to be caused by vibration. My A/P says if we could find some similar screening (he says welded at joints would be an improvement) he could replace it and sign off on the alteration. But it "will be a project" to use his words, which is code for "get out the wallet". He says removal is an option as well, so your post is exactly right I think.

He will have to apply for a Field Approval with the local FSDO and do a Form 337 as well as a log book entry. Right now it's next to impossible to get the Feds to do Field Approvals.

[Ed Coffman]

You can make your own parts if they match the original.


14 CFR Part 21 CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS.
Subpart K--Approval of Materials, Parts, Processes, and Appliances
Sec. 21.303 - Replacement and modification parts.

(a) Except as provided in paragraph (b) of this section, no person may produce a modification or replacement part for sale for installation on a type certificated product unless it is produced pursuant to a Parts Manufacturer Approval issued under this subpart.
(b) This section does not apply to the following:
(2) Parts produced by an owner or operator for maintaining or altering his own product.

Here is an expanded version:

A replacement part may be manufactured by an owner or operator as long as it does not result in an alteration of the product from the type design. It can only be made for use on your airplane and can not be sold for use by another.

The part has to be made of the same material(s) and equal to the original part in strength, fit, form, function, etc. If it is not the same, then it is an alteration. This would "normally" just require a 337 be filled out for the major repair and a logbook entry.

The owner or operator may have someone make the part as long as he is responsible for the design or quality control of the part. But, the person returning the aircraft to service (putting name and certificate number in the logbooks) is the one responsible to make sure it is appropriate for the application and meets the airworthiness requirements of the type design.

A part made to alter the airplane would require an STC or field approval prior to the alteration being done.
________
California Dispensaries

[hharney]

http://www.337skymaster.com/messages...ead.php?t=2303

[Paul Sharp]

Sammy at Air Services (Carrollton, GA) had some of that material - it was the official stuff - 6 or 7 few years ago. He may still have some. It isn't that cheap material you can get at the hardware store but the real thing. I bought some from him and the mechanics I had at the time re-fashioned the rear screen and said it wasn't really difficult at all. It really didn't cost all that much and I'm really glad to have it. I have always been told an considered it well worth the protection from FO damage to the rea prop.