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requirements for engine swap

Posted By:
Mark Hubelbank
Homebuilder or Craftsman
7
Posts
0
#1 Posted: 6/16/2011 13:32:00

I would like to know exactly what the paperwork requirements are for doing an engine and/or prop swap on an experimental aircraft. Does this require a new FAA inspection? A clearance from the FAA office? Clearly everything must go into the logs but it is not clear what is required beyond that.



Dave Prizio
Young Eagles Pilot or VolunteerHomebuilder or Craftsman
118
Posts
29
#2 Posted: 6/16/2011 16:31:55

An engine swap is probably a major modification, unless both the new and old are the same manufacturer and the same horsepower. Even with the same manufacturer and horsepower there may be cases where you are still looking at a major modification, but most likely not. A prop swap is also probably a major mod unless the change is very minor. If there is any doubt you can run it past your local FSDO.

Assuming you are doing a major modification, your first point of reference is your Operating Limitations. That will tell you what you need to do.  In most cases you will need to contact the local FSDO and tell them what you did. They will then assign you a flight test area and duration, which will put you pack into Phase I flight test mode. Once the modification is complete you should record the work in the aircraft logbook. After you fly off the test hours you will need to make  another logbook entry stating that Phase I testing is complete. See the language used at the completion of your original Phase I testing for an example. I believe it can also be found in AC20-27G.

Weight and balance paperwork will also need to be updated. This should be done before your Phase I flight testing begins. You can reweigh the plane or just do it on paper by subtracting the weights and moments of the old components and adding the weight and moments of the new components.

You do not need to hold the repairmans certificate to do this work or sign it off. But if you do not hold the repair. cert. you will need to have enough documentation to convince an A&P that what you did was sound and airworthy.

 



Mark Hubelbank
Homebuilder or Craftsman
7
Posts
0
#3 Posted: 6/17/2011 17:03:43

Thanks, So as the holder of an experimental repairman certificate, one must get paperwork from the local FSDO but a new inspection by a DAR is not required. Assuming that the Boston FSDO does not make too big a deal out of this, it should be managable.

The plan would definately be to go to a different engine manufacturer, no more tinker toys.



Dave Prizio
Young Eagles Pilot or VolunteerHomebuilder or Craftsman
118
Posts
29
#4 Posted: 6/20/2011 15:13:33

No DAR involvement is required for a major modification under an existing airworthiness certificate. It woudl be a very good idea to have a qualified person such as an EAA Tech Counselor take a look at the new engine installation before you fly it, but there is no legal requirement to do so.

BTW, you do not need to hold the repairmans certificate to perform a major modification. You only need that for the yearly condition inspection.

Your FSDO "paperwork" is only to designate a flight test area and a duration for the new Phase I flight test period. They should not ask for anything beyond that.

 



Mark Hubelbank
Homebuilder or Craftsman
7
Posts
0
#5 Posted: 6/20/2011 15:56:24

Sounds good. Assuming I go through this, there is a mechanic a couple of hangers from mine who has been very helpful. He has done a lot of work on both commercial and home built aircraft. For me this is probably better than an adviser as he is the ultimate hanger rat and is there all the time.