AD-56-03-03
Wing Center Attach Cracks & Plate


Category: navion, wing

Applicability: All models

Supersedes: n/a

Compliance: Inspect all Navions for this condition as soon as practicable but not later than May 1, 1956. No further inspections will be necessary upon installation of these end plates.

Procedure: Cracks starting at the wing centerline attaching bolt hole in the wing rear spar junction fittings (P/N 145—14070) at wing
Station 0 have been found on a number of Navion aircraft. Access to these fitting may be gained through the main wheel wells. If no cracks are found, 3/16-inch thick 1010 steel (or equivalent) end plates, properly rediused for a snug fit, should be installed in each fitting prior to the next 50 hours of flight time. If cracks are found, they should be stop-drilled with a No. 60 (0.040 drill and the end plates as described above should be installed prior to the next flight.

Notes: Ryan Navion Service Bulletin No. 23 dated December 5, 1955, covers this same subject.


AD-56-03-03