67-28-01 AERO COMMANDER: Amdt. 39-492, Part 39, Federal Register October 10, 1967. Applies to Models 560E, 680, 680E, and 720 Airplanes.
Compliance required within the next 25 hours' time in service after the effective date of this AD unless already accomplished.
To detect cracks in the lower front spar cap between wing station 67 and 86 on each wing, accomplish either (a) or (b) of the following:
(a) Perform visual and dye penetrant inspection in accordance with Aero Commander Service Bulletin Number 92 dated September 29, 1967. To facilitate inspection, a top wing access door may be installed in accordance with instructions contained in Aero Commander's letter to all owners and operators dated October 3, 1967.
(b) Inspect in accordance with procedures approved by the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.
If cracks are detected during above inspections, contact Aero Commander for approved repair or repairin accordance with a method approved by the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.
Upon completion of the inspection, positive or negative findings including total time in service shall be forwarded to the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.
This amendment effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by air mail letter dated October 5, 1967.