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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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