AD 64-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | P. V. Shields | A-26B (Army) | Airworthiness Directives; DOUGLAS Models A-26B and A-26C |
| aircraft | P. V. Shields | A-26C (Army) | Airworthiness Directives; DOUGLAS Models A-26B and A-26C |
Unsafe Condition
Failure of the wing rear spar caps in the vicinity of the flap inboard hinges and failure of the wing rear spar lower caps near the inboard end of the fore and aft flanges and the forward flange 3/8 inch bolt hole, as well as failure of the front spar lower caps in the vicinity of Wing Station 140 due to cracks in specified areas.
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Required Actions
Inspect rear upper and lower spar caps using visual and dye penetrant methods for cracks near flap hinge bolt holes and surrounding areas. Remove wing-to-fuselage fillets and inspect flanges for cracks around bolt holes using penetrant inspection. Inspect front spar lower caps via removal of fittings and eddy current or radiographic methods. Replace or repair cracked spar caps before further flight. Discontinue inspections if modifications per approved technical data are made. Revise operating limitations for restricted category aircraft to restrict weight, speed, and areas of operation.
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Compliance Time
Compliance required as indicated. Inspections under (a) must be conducted within 250 hours' time in service after the effective date (July 15, 1975) unless already done within the last 250 hours, and thereafter every 500 hours. Inspections under (b) have varying intervals based on military flight time: 250/500, 125/500, or 15/250 hours' time in service.
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Affected Aircraft
Douglas Models A-26B (later USAF B-26B) and A-26C (later USAF B-26C) aircraft, including those certified under Part 8 of the Civil Air Regulations.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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