65-26-01 FAIRCHILD: Amdt. 39-157 Part 39 Federal Register November 17, 1965. Applies to Model F-27 Series Airplanes.
Compliance required as indicated.
To prevent further corrosion of the magnesium aileron control sectors, accomplish the following:
(a) For airplanes with aileron sectors, P/N's 27-727207-21, 27-727208-21, 27-727209-21, 27-727300-21, and 27-727381-21, with two or more years installed time on the effective date of this AD, comply with (c) within the next four weeks after the effective date of this AD, unless already accomplished within the last twelve weeks.
(b) For airplanes with aileron sectors specified in (a), with less than two years installed time on the effective date of this AD, comply with (c) before the accumulation of two years and four weeks installed time, unless already accomplished within the last twelve weeks.
(c) Visually inspect all surfaces of each aileron sector for corrosion.
NOTE. - Aileron sectors, P/N's 27-727207-21, 27-727208-21, and 27-727209-21 are located under the cockpit floor, on the auxiliary shaft at Fuselage Station 129.917, approximately 20 inches to the left and right of the center of fuselage. Aileron sector, P/N 27-727300-21, is located in the left wing center section at Wing Station 54.135, and is mounted on the aft face of the wing rear spar. Aileron sector, P/N 27-727381-21, is located in both the left and right wing outer panel, at Wing Station 398.320 and is mounted on the aft face of the wing rear spar. During the inspection required by (c), particular attention should be given to the cable groove, ball socket and ball sleeve.
(1) If corrosion is found, before further flight except that the airplane may be flown in accordance with FAR 21.197 to a base where the repair can be made:
(i) Replace the part with an unused part of the same part number or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, and comply with (c) within two years from the inspection;
(ii) Replace the part with Fairchild Hiller aluminum aileron sector P/N 27-727207-23, 27-727208-23, 27-727209-23, 27-727300-23, or 27-727381-23 as applicable, or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region; or
(iii) Remove the corrosion in accordance with (d) and reinspect in accordance with (c) at intervals not to exceed 16 weeks from the last inspection. If corrosion is found, comply with (c)(1).
(2) If no corrosion is found, comply with (c) within one year from the inspection.
(d) Remove corrosion from aileron sectors, P/N's 27-727207-21, 27-727208-21, and 27-727209-21, in accordance with Fairchild Service Letter No. 311, dated April 12, 1965, or later FAA-approved revision or an FAA-approved equivalent; from aileron sector, P/N 27-727300-21, in accordance with Fairchild Service Letter No. 307 dated September 17, 1963, or later FAA-approved revision or an FAA-approved equivalent; from aileron sector P/N 27-727381-21, in accordance with Fairchild Service Letter No. 306, dated August 22, 1963, or later FAA-approved revision or an FAA-approved equivalent.
(e) 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 directive effective December 17, 1965.