Reply-To: Sky2high@aol.com
Reply-To: lancair.list@olsusa.com
From: "Scott Krueger" <sky2high@hotmail.com>
To: lancair.list@olsusa.com
Cc: Sky2high@aol.com
Subject: Form 337s for Eperimental Amateur Built Aircraft
Date: Thu, 08 Mar 2001 07:27:29 -0600
Message-ID: <F47c9ny7BXx4XFKpRcT00003a15@hotmail.com>
Mime-Version: 1.0

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At this time, if you install approach certified GPS equipment in your 
experimental aircraft, such as a Garmin 430, the FAA must sign it off and 
the installation must be performed by a certified Avionics shop.  You will 
receive a 337 form after such an installation.  My avionics shop also hired 
me for $1 to perform the required accuracy flight tests.

Under the old Experimental Airworthiness certification, you had to get 
written FAA approval for a "major modification" before you could fly.  A 
friend cut off the back of his certified E-Racer, took out the mid mounted 
auto engine, attached a blown I/O 540 and called the FAA.  Their visit 
confirmed it was still an airplane and they required him to fly off 3 
additional hours.  So much for a 337.

Concerned about the changes I had made to my plane (and logged), I wrote to 
the FAA claiming that my modifications were minor and asked them to confirm 
this in writing.  I did receive such a confirmation and a notation that 
their response was like a form 337 and should be attached to the aircraft 
log.

If your aircraft were to be certified now, the following limitation would be 
included in your airworthiness certificate:

(17) After incorporating a major change as described in § 21.93, the 
aircraft owner is required to re-establish compliance with § 91.319(b). All 
operations will be conducted day VFR in a sparsely populated area. The 
aircraft must remain in flight test for a minimum of 5 hours. Persons 
non-essential to the flight shall not be carried. The aircraft owner shall 
make a detailed log book entry describing the change prior to the test 
flight. Following satisfactory completion of the required number of flight 
hours in the flight test area, the pilot shall certify in the records that 
the aircraft has been shown to comply with § 91.319(b). Compliance with § 
91.319(b) shall be recorded in the aircraft records with the following or a 
similarly worded statement: "I certify that the prescribed flight test hours 
have been completed and the aircraft is controllable throughout its normal 
range of speeds and throughout all maneuvers to be executed, has no 
hazardous operating characteristics or design features, and is safe for 
operation. The following aircraft operating data has been demonstrated 
during the flight testing: speeds Vso______, Vx______, and Vy______, and the 
weight______, and CG location______ at which they were obtained." (18) This 
aircraft shall not be used for glider towing, banner towing, or intentional 
parachute jumping.

The above text was obtained from the EAA member site:

http://members.eaa.org/home/homebuilders/government/operations.html

Ergo, your logbook entry would be the 337.

Note that minor changes should also be logged as minor changes so that, at a 
later time, any variance from the "certified" airplane will have been noted 
as required by the FARs.

Scott Krueger
N92EX

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