74-19-01 PIPER: Amendment 39-1952. Applies to Piper PA-28-235 airplanes, serial numbers 28-7410001 through 28-7410090, PA-32-260 airplanes serial numbers 32-7400001 through 32-7400047, PA-32-300 airplanes 32-7440001 through 32-7440147, and PA-34-200 airplanes serial numbers 34-7450001 through 34-7450205 certificated in all categories.
Compliance required within the next ten hours time in service after the effective date of this AD, unless already accomplished.
To detect improperly formed lightening holes in the outer wing spars, accomplish the following:
(a) PA-28-235 and PA-32 series airplanes
(1) Remove the inspection plate on bottom of wing which is located adjacent to the aileron bellcrank.
(2) Inspect both sides of left and right spar around the first lightening hole outboard of the fish mouth of the main spar splice for evidence of a die stamping mark approximately six by six inches square surrounding the lightening hole area.
(3) Inspect the lightening hole flange radius for cracks.
(b) PA-34 series airplanes
(1) Remove the inspection plate on bottom of wing which is located adjacent to the aileron bellcrank and aft of the outboard fuel tank.
(2) Inspect as in paragraph (a)(2) around first and second lightening holes outboard of the fish mouth at the main spar splice.
(3) Inspect the lightening flange radii for cracks.
(c) If square die stamping mark is evident on the aft side of spar only and there are no cracks in the lightening hole flange radii, no further action is required.
(d) If square die stamping mark is evident on forward side of spar and/or if there are cracks in the lightening hole flange, replace the outboard spar with a serviceable spar of the same part number or repair in a method approved by the Chief, Engineering and Manufacturing Branch, FAA Southern Region.
(e) Report positive findings from paragraph (d) to Chief, Engineering and Manufacturing Branch, FAA SouthernRegion within 10 days of inspection.
(Reporting approved by the Bureau of the Budget under BOB No. 04-R0174.)
This amendment becomes effective September 7, 1974.