63-24-02 MARTIN: Amdt. 645 Part 507 Federal Register November 21, 1963. Applies to All Models 202, 202A and 404 Aircraft.
Compliance required as indicated.
Due to cracks found in the rear wing spar flange and in the Eastern Airlines P/N 304- 5098-1 doubler, on several aircraft, accomplish the following within 50 hours' time in service after the effective date of this AD, unless already accomplished within the last 450 hours' time in service, and at intervals thereafter not to exceed 500 hours' time in service from the last inspection.
(a) Wings which have not been repaired in accordance with Eastern Airlines Drawing No. 404-5098 or equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region, shall be inspected as follows:
(1) Inspect the wing rear spar lower cap flanges inboard side of nacelle at Stations 133 to 135. (Cracks develop at bolt holes in fretted area generated by nacelle doubler.) Inspect these areas on left and right wings with 10-power glass and dye penetrant or by an acceptable X-ray procedure or by FAA approved equivalent. Repair cracked members in accordance with Eastern Airlines Drawing No. 404-5098 or an equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region before further flight.
(b) Wings which have been repaired in accordance with Eastern Airlines Drawing No. 404-5098 or equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region, shall be inspected as follows:
(1) Inspect the wing rear spar lower cap flanges, inboard side of nacelle at Stations 133 to 135 on left and right wings, with 10-power glass and dye penetrant or by an acceptable X-ray procedure or by FAA approved equivalent. If 10-power glass and dye penetrant or FAA approved equivalent method is used, the Eastern Airlines P/N 304-5098-1 doubler or FAA approved equivalent located at wing Station 135 on the rear spar lower cap shall be removed. The repair of cracked member shall be approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, before further flight.
(2) Inspect the wing rear spar doubler, Eastern Airlines P/N 304-5098-1 or FAA approved equivalent at Stations 133 to 135 for cracks. Inspect this doubler on left and right wings with a 10-power glass and dye penetrant or by an acceptable X-ray procedure or by FAA approved equivalent.
(i) Replace doubler having cracks greater than 1/2 inch in length before further flight with a part of the same part number or an equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
(ii) Inspect doublers having cracks less than 1/2 inch in length every 25 hours' time in service. When inspection reveals that the crack exceed 1/2 inch in length the part shall be replaced before further flight with a part of the same part number or an equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
(c)Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator.
This supersedes AD 59-20-03.
This directive effective November 21, 1963.