38 ADs indexed for Hiller Aviation | Siam Hiller Holdings, Inc. aircraft.
Airworthiness Directives; Siam Hiller Holdings, Inc. Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 Helicopters
Unsafe Condition: Separation of the control system linkage at pivoting joints in the control system, leading to loss of control of the helicopter.
Why matched: Airworthiness Directives; Siam Hiller Holdings, Inc. Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 Helicopters
Airworthiness Directives; Hiller Aircraft Corporation Model UH-12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters
Unsafe Condition: Cracks in the head area of the outboard tension-torsion (T-T) bar pin could result in loss of in-plane stability of the main rotor blade and subsequent loss of control of the helicopter.
Why matched: Airworthiness Directives; Hiller Aircraft Corporation Model UH-12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters
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: Separation of the control rotor blade assembly and subsequent loss of control of the helicopter due to corrosion, cracks, elongation, corrosion, burrs, pitting, or fretting of the bolt holes in the...
Why matched: 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
Airworthiness Directives; ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER) Model UH-12E, UH-12E-L, UH-12L, and UH-12L4 Series Helicopters
Unsafe Condition: Failure of a tail rotor blade assembly, which could result in loss of controllability of the helicopter.
Why matched: Airworthiness Directives; ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER) Model UH-12E, UH-12E-L, UH-12L, and UH-12L4 Series Helicopters
Airworthiness Directives; ROGERSON HILLER CORP. Model UH-12D, UH-12E, and UH-12E4 Series Helicopters
Unsafe Condition: Main rotor blade failure due to cracking of the spar or delamination of the trailing edge skin from the spar.
Why matched: Airworthiness Directives; ROGERSON HILLER CORP. Model UH-12D, UH-12E, and UH-12E4 Series Helicopters
Airworthiness Directives; ROGERSON HILLER CORP Model UH-12D, UH-12E, UH-12E4 Series and Military OH-23F and OH-23G Helicopters
Unsafe Condition: Cracks and failures in the main rotor blade fork P/N 52110-3 at the outboard tension-torsion bar retention bolt hole.
Why matched: Airworthiness Directives; ROGERSON HILLER CORP Model UH-12D, UH-12E, UH-12E4 Series and Military OH-23F and OH-23G Helicopters
Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters
Unsafe Condition: Cracks in the gusset weld beads of engine mount Part No. 63181-5 due to fatigue from turbine power conversion under STC SH177WE or SH178WE.
Why matched: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters
Airworthiness Directives; HILLER AVIATION Models UH-12D, UH-12E, UH12E 4 Place, OH-23G and H-23F, Series Helicopters
Unsafe Condition: Main rotor blade failure due to delamination of the main rotor blade root doublers or skin bond separation.
Why matched: Airworthiness Directives; HILLER AVIATION Models UH-12D, UH-12E, UH12E 4 Place, OH-23G and H-23F, Series Helicopters
Airworthiness Directives; HILLER AVIATION Model UH-12E, UH-12L, OH-23F and G Series Helicopters
Unsafe Condition: Cracks in the engine drive torsional coupling assembly housings P/N 21047-9, -11 (S/N 704 through 766), and P/N 21047-15 (all serial numbers) could lead to failure of the assembly.
Why matched: Airworthiness Directives; HILLER AVIATION Model UH-12E, UH-12L, OH-23F and G Series Helicopters
Airworthiness Directives; HILLER AVIATION Model UH-12E and UH-12L Series Helicopters
Unsafe Condition: Possible loss of driving torque to the helicopter rotor system due to torsional couplings P/N 21047-9 and -11 serial numbers 497 through 766.
Why matched: Airworthiness Directives; HILLER AVIATION Model UH-12E and UH-12L Series Helicopters
Airworthiness Directives; HILLER AVIATION Model UH-12D, UH- 12E, UH-12E4, UH-12E-L, UH-12L and UH-12L4 Series Helicopters
Unsafe Condition: Loss of power to the main and tail rotors due to failure of the mercury clutch attachment bolts (P/N 21041) and washers (AN 960-716L).
Why matched: Airworthiness Directives; HILLER AVIATION Model UH-12D, UH- 12E, UH-12E4, UH-12E-L, UH-12L and UH-12L4 Series Helicopters
Airworthiness Directives; HILLER AVIATION Model UH-12 Series Helicopters
Unsafe Condition: Tail rotor skin cracks and loose rivets can lead to tail rotor failure.
Why matched: Airworthiness Directives; HILLER AVIATION Model UH-12 Series Helicopters
Airworthiness Directives; HILLER AIRCRAFT Model UH-12 Series Helicopters
Unsafe Condition: Failure of the main transmission due to magnetic chips or gold colored flecks in the oil filter and chip detector.
Why matched: Airworthiness Directives; HILLER AIRCRAFT Model UH-12 Series Helicopters
Airworthiness Directives; HILLER AVIATION Models UH-12D, UH-12E and UH-12E4 Series Helicopters
Unsafe Condition: Main rotor blade failure due to delamination of the skin at the blade tip.
Why matched: Airworthiness Directives; HILLER AVIATION Models UH-12D, UH-12E and UH-12E4 Series Helicopters
Airworthiness Directives; HILLER AIRCRAFT Models UH-12D, UH-12E, OH-23G, UH-12L Helicopters
Unsafe Condition: Rudder balance cables (P/N HS 1053-2) may fray and break due to non-conformance with the type design requiring 7 x 19 cable.
Why matched: Airworthiness Directives; HILLER AIRCRAFT Models UH-12D, UH-12E, OH-23G, UH-12L Helicopters
Airworthiness Directives; HILLER AVIATION Models UH-12D and UH-12E (including 4-place) Helicopters
Unsafe Condition: Engine, transmission, or driveline failure and resultant loss of power due to the Soloy Part Number 560-2408-2 engine output coupling shaft.
Why matched: Airworthiness Directives; HILLER AVIATION Models UH-12D and UH-12E (including 4-place) Helicopters
Airworthiness Directives; HILLER HELICOPTERS Model UH-12D, UH-12E and UH-12 Helicopters
Unsafe Condition: Fatigue failure of the main rotor blade anti-node bars.
Why matched: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D, UH-12E and UH-12 Helicopters
Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters
Unsafe Condition: Repeated execution of emergency procedures involving unnecessary external load deployment and full autorotation following false low rotor speed warning system activation.
Why matched: Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters
Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E (4 Place) Helicopters
Unsafe Condition: Failure of finite life components such as engine snubber assemblies, brackets, flyweight collective pitch ballast, bellcrank, tube, shaft, block assembly, arm assembly, scissor, and attaching bolts...
Why matched: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E (4 Place) Helicopters
Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters
Unsafe Condition: Loss of flight control or engine control
Why matched: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters