62-18-02 GENERAL DYNAMICS/CONVAIR: Amdt. 476 Part 507 Federal Register August 18, 1962. Applies to All Model 30 Series Aircraft.
Compliance required as indicated.
To preclude an unsafe condition resulting from cracking of the pylon forward engine thrust beacon channels, P/N's 30-24011-71 and -72, accomplish the following:
(a) Within the next 50 hours' time in service following the effective date of this AD unless already accomplished within the last 50 hours' time in service, and thereafter at periods not to exceed 100 hours' time in service from the last inspection, conduct a close visual inspection of channels P/N's 30-24011-71 and -72 for any evidence of cracking, particular attention shall be given to the area of the relief radius in the vicinity aft end of each channel.
(b) A channel exhibiting a crack in the vertical web not exceeding 1 1/2 inch may be continued in service provided that the crack is stop drilled with a 1/4-inch drill and the channel is inspected thereafter at periods not to exceed 12 hours' time in service.
(c) A channel which has been stop drilled in accordance with (b) and in which the crack is found at a subsequent inspection to have progressed beyond the stop drill hole, may be continued to be used for an additional 12 hours' time in service provided that it is once again stop drilled with a 1/4-inch drill and the total length of crack does not exceed 1 1/2 inch.
(d) Channels exhibiting cracks in the vertical web greater than 1 1/2 inch in length or cracks which have progressed in the horizontal web, shall be replaced prior to a further flight with a new part of the same part number or with an FAA engineering approved equivalent. When a cracked channel is replaced with a new channel P/N's 30-24011-71 or -72, the new channel shall be inspected in accordance with (a) at intervals not to exceed 100 hours' time in service, and when found cracked, shall be subject to the provisions of (b) and (c).
(e) The repetitive inspections required by this AD may be discontinued on replacement channels described in Part B of General Dynamics/Convair Alert Service Bulletin A54-4 or equivalent parts approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region.
(f) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Western 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.
(General Dynamics/Convair Alert Service Bulletin A54-4 for the Model 30 covers this same subject.)
This directive effective August 23, 1962.