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I have been gone for a week or so (checking a new IV P) and on checking the

mail have found some interesting subjects that I might shed some light on.

Item 1: Airworthiness.

If you have your "Operating Limitations" handy, and if they are standard (?),

(see AC 20-27D-appendix 9) item 7 in Phase 1,reads;

the cognizant FAA office must be notified and their response received in

writing prior to flying this aircraft after incorporating a major change as

defined by FAR section 21.93.



B.R. makes comment that we are to comply with Appendix A to-part 43 of the

FAR's. Not so. FAR 21.93



 It says;                      



 Sec. 21.93 Classification of changes in type design.

(a) In addition to changes in type design specified in paragraph (b) of this

section, changes in type design are classified as minor and major. A "minor

change" is one that has no appreciable effect on the weight, balance,

structural strength, reliability, operational characteristics, or other

characteristics affecting the airworthiness of the product. All other changes

are "major changes" (except as provided in paragraph (b) of this section).

(b) For the purpose of complying with Part 36 of this chapter, and except as

provided in paragraphs (b)(2), (b)(3), and (b)(4) of this section, any

voluntary change in the type design of an aircraft that may increase the noise

levels of that aircraft is an "acoustical change" (in addition to being a

minor or major change as classified in paragraph (a) of this section) for the.

following aircraft:

(1) Transport category large airplanes.

(2) Turbojet powered airplanes (regardless of category). For airplanes to

which this paragraph applies,

"acoustical changes" do not include changes in type design that are limited to

one of the following--

(i) Gear down flight with one or more retractable landing gear down during the

entire flight, or

(ii) Spare engine and nacelle carriage external to the skin of the airplane

(and return of the pylon or other

external mount), or

(iii) Time-limited engine and/or nacelle changes, where the change in type

design specifies that the

airplane may not be operated for a period of more than 90 days unless

compliance with the applicable

acoustical change provisions of Part 36 of this chapter is shown for that

change in type design.

(3) Propeller driven commuter category and small airplanes in the primary,

normal, utility, acrobatic,

transport, and restricted categories, except for airplanes that are:

(i) Designated for "agricultural aircraft operations" (as defined in Sec.

137.3 of this chapter, effective

January 1, 1966) to which Sec. 36.1583 of this chapter does not apply, or

(ii) Designated for dispensing fire fighting materials to which Sec. 36.1583

of this chapter does not apply,

or --------------------etc. etc.

I added all this to show that it is not applicable to an experimental

aircraft!



More later on  Item 3-- Densely populated areas.