Classification of minor & major repair
Classification of minor & major repair
(OP)
Hi guys,
Can anybody help me to understand how can I classify a repair?
I mean, which variables do I have to consider to come to a major or minor repair for critical or not critical parts.
Is a repair on critical parts always a major repair?
I appreciate your feedback,
Cheers,
D.
Can anybody help me to understand how can I classify a repair?
I mean, which variables do I have to consider to come to a major or minor repair for critical or not critical parts.
Is a repair on critical parts always a major repair?
I appreciate your feedback,
Cheers,
D.





RE: Classification of minor & major repair
RE: Classification of minor & major repair
do you take into account if the part is classified critical (or not) for your evaluation?
(Definition of critical part: A critical part is a part, the failure of which could have a catastrophic effect upon the A/C, and for which critical characteristics have been identified which must be controlled to ensure the required level of integrity)
RE: Classification of minor & major repair
" Major repair means a repair:
(1) That, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or
(2) That is not done according to accepted practices or cannot be done by elementary operations."
Kinda vague, huh?
Note this phrase: might appreciably affect
It's up to you to PROVE by citing chapter & verse of the cert. regs that no-way-no-how is your repair going to "affect" the above mentioned areas, when seeking approval for the repair.
The following should clear everything up. Also from Part 1:
"Minor Repair. A repair other than a major repair."
Here are some advisory circulars dealing with the issue:
http://rgl.faa.gov/Regulatory_and_Guidance_Library...
http://rgl.faa.gov/Regulatory_and_Guidance_Library...
RE: Classification of minor & major repair
i think it (part criticality) would come into play when you consider the affect of your repair on the existing inspection program; eg if you cover the surface with a doubler, now you change the inspection technique from visual/HFEC to LFEC.
RE: Classification of minor & major repair
http://www.tc.gc.ca/eng/civilaviation/regserv/cars...
And they then provide a list of questions to help you decide if the repair or modification is major or minor:
http://www.tc.gc.ca/eng/civilaviation/regserv/cars...
Still leaves lots of room for interpretation! (Other than a negligible effect...)
RE: Classification of minor & major repair
I use an SRM for a military aircraft that classifies a major repair as: "A repair that involves restoring two or more primary structural members to original loadcarrying requirements
and/or aerodynamic characteristics is considered a major repair."
RE: Classification of minor & major repair
As I said, the installer makes the determination. I've made a point to include my logic for determining minor in my log entries so anyone trying to second guess me can see how I made the determination.
Major and Minor have been argued for the 30+ years I've been in this business and FAA pendulum seems to swing back and forth. It's a moving target. If you really want to be sure, always use approved data, but that requires $$$ to get it approved.
RE: Classification of minor & major repair
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: Classification of minor & major repair
I have seen repairs that should have a form 337 filled out done with just a logbook entry, and a 3" tear in fabric that could have been done with a logbook entry, with a 337 form and an additional page attached.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Classification of minor & major repair
David