AD 72-07-01

72-07-01 McCULLOCH AIRCRAFT CORP.: Amendment 39-1410. Applies to Model J-2 Gyroplane, compliance, as indicated, required before further flight unless already accomplished.

1. For serial numbers 10 and subsequent: By means of a propeller protractor, determine that the angle between the rotor mast and pitch bearing case is not less than 3.9 and not greater 5.0 degrees. If the angle measured is not within the tolerance indicated, rerig per paragraph 4.4 of McCulloch Aircraft Corporation Service Bulletin 8C dated February 24, 1972 or later FAA-approved revisions.

2. For serial numbers 10 through 54:

(A) Inspect collective stick, part number 27133, for loose rivets at the juncture with collective stick shaft, part number 27104.

(B) If loose rivets are found, replace the collective stick assembly with the new collective stick assembly per paragraph 4.1 "Rework-Effectivity (A)" of McCulloch Aircraft Corporation Service Bulletin 8C or with an equivalent approved byChief, Aircraft Engineering Division, FAA Western Region.

(C) If no loose rivets are found and until the rework per paragraph 4.1 of McCulloch Aircraft Corporation Service Bulletin 8C is accomplished, reinspect for loose rivets at intervals not to exceed twenty-five (25) hours of flight time.

This amendment is effective March 22, 1972 for all persons except those to whom it was made effective by airmail letter dated March 3, 1972, which contained this amendment.