AD 55-19-01

Airworthiness Directives; Hiller Aircraft Corporation Model UH-12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters

Unsafe Condition: Outboard Tension-Torsion Bar Pin

Airworthiness Directives; Hiller Aircraft Corporation Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, CH-112, H-23A, H-23B, H-23C, H-23D, H-23F, HTE-1, HTE-2, and OH-23G Helicopters

Unsafe Condition: Blade Spar Tube and Cuff Inspection

Airworthiness Directives; ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER) Model UH-12E, UH-12E-L, UH-12L, and UH-12L4 Series Helicopters

Unsafe Condition: Tail Rotor Blade Assemblies

Airworthiness Directives; ROGERSON HILLER CORP. Model UH-12D, UH-12E, and UH-12E4 Series Helicopters

Unsafe Condition: Main Rotor Blades