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Steps to preclude the possibility of fuel coming in contact with the left exhaust manifold in the event of a failure in the primer line.
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The recurrence of muffler failures has necessitated redesign of the muffler to eliminate the possibility of carbon monoxide being introduced into the cabin.
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Procedure for visual inspection of part number 40511 muffler.
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Recommended modifications for winter operations of Piper J-3, PA-11 and PA-12 aircraft.
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Inspection to determine if there is interference between the inboard end of the front spar web and the aileron pulley attachment bolt in the area of the front wing hinge fitting.
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Possibility of the fuel valve detent pins in a few valves were improperly centered, thus preventing positive indication of valve position.
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Due to the possibility of a defective fitting on the upper end of the control column shaft in the aileron control system, the system should be tested to a load of 94 pounds.
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Inspect landing gear shock strut end fittings for cracks or other defects in the small bend radii.
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Inspect all control surface hinges for evidence of loose or working hinge pins at a frequency of not less than at time of each periodic.
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Replace the four sheet metal screws attaching your aircraft identification plate on with rivets or blind rivets.