08/31/2021Univair
Required inspections of the ailerons, aileron balance assembly, and aileron rigging for looseness or wear, and required repair or replacement of parts as necessary.
08/31/2021Univair
Requires installing inspection openings in the outer wing panels, inspecting the wing outer panel structural components for corrosion, and repairing any corroded component.
08/31/2021Univair
Inspecting the wing center section for evidence of corrosion through the installation of inspection openings and use use of a specified scope and light source.
08/31/2021Univair
Prevent failure of the fuel line fittings or the gascolator due to the current airplane design configuration. Such failure could result in a lack of fuel to the engine with consequent loss of control of the airplane.
08/31/2021Univair
Inspection and rework to detect the use of improper screws attaching the left and right rudder pedal shaft assemblies to the nose wheel steering tie rods.
08/31/2021Univair
To prevent loss of rudder control inspect the rudder control system and modify the rudder bellcrank assembly in a manner prescribed in this AD.
08/31/2021Univair
Instructions to preclude failure of brittle bolts and the danger of the nose wheel turning crosswise during landing on aircraft incorporating Electrol hose gear with aluminum scissors.
08/31/2021Univair
Fatigue failures have continued to occur in the rudder main rib where the control horn is attached after installation of reinforcement plates.
08/31/2021Univair
Frequent failures of the rear spar center section due to cracking of the upper flange.
08/31/2021Univair
Failures of the rudder horn attachments, attributed to improper ground handling technique rather than to unusual flight loads.
08/31/2021Univair
Replacing leaky fuel tank with one made of stainless steel or aluminum alloy before the next flight.
08/31/2021Univair
Inspection of control cables for continual fraying and failure in the control column assembly.
08/31/2021Univair
To eliminate instances of the nose ski coming off when operating on Federal Aircraft Works Model A-1500 skis, a supplementary safety device should be installed.
08/31/2021Univair
Preventing elevator flutter in the event the elevator trim tab control wire fails by installing elevator trim tab stop and spring.
08/31/2021Univair
Listed airplanes may contain a control column shaft, P/N 415-52129, which is defective at its lower bearing fitting.
08/31/2021Univair
Checking the operation of the voltage regulator by observing the ammeter reading.
08/31/2021Univair
Install a new battery box drain tube to extend at least 1/2 inch below the fuselage belly skin if this has not been already incorporated in the airplane.
08/31/2021Univair
Flexing of the lower aileron skin has resulted in fatigue cracks in the beam in the balance weight area.
08/31/2021Univair
Cracks have occurred in the belly skin at the rearmost rivet attaching the center section belly skin outer stiffeners to the belly skin.
08/31/2021Univair
A positive locking device must be installed on the zipper in the baggage compartment bottom to prevent articles to fall through and foul the controls.