Hiller Aviation | Siam Hiller Holdings, Inc. Airworthiness Directives

114 ADs indexed for Hiller Aviation | Siam Hiller Holdings, Inc. aircraft.

Models

UH-12E 36 ADs UH-12D 33 ADs UH-12E-L 18 ADs UH-12L 15 ADs UH-12L4 14 ADs UH-12A 12 ADs UH-12 11 ADs UH-12B 11 ADs UH-12C 10 ADs UH-12 9 ADs UH-12A 9 ADs UH-12B 9 ADs M-62A-3 8 ADs M-62A 7 ADs M-62A-4 7 ADs M-62B 7 ADs M-62C 7 ADs Various 3 ADs UH-12C 3 ADs UH-12D 2 ADs 280 1 AD 280C 1 AD 280F 1 AD B-2 1 AD B-2A 1 AD B-2B 1 AD F-28 1 AD F-28A 1 AD F-28C 1 AD Starting Vibrator Assemblies 1 AD 47G 1 AD 47G-2 1 AD 47G-2A 1 AD 47G-2A-1 1 AD 47G-3 1 AD 47G-3B 1 AD 47G-3B-1 1 AD 47G-3B-2 1 AD 47G-3B-2A 1 AD UH-12D 1 AD UH-12E 1 AD UH-12E-L 1 AD

Recent ADs

2025-15-02

final rule

Airworthiness Directives; Siam Hiller Holdings, Inc.

Unsafe Condition: unsafe condition on these products.

Effective: Sep 24, 2025 Category: aircraft

2000-24-21

final rule

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: This amendment adopts a new airworthiness directive (AD), for Siam Hiller Holdings, Inc. (Hiller), formerly Rogerson Hiller Corporation, Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH- 12E...

Effective: Jan 10, 2001 Category: aircraft

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

97-20-15

final rule

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

Effective: Nov 12, 1997 Category: aircraft

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

97-20-15

final rule

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

Effective: Nov 12, 1997 Category: aircraft

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

97-20-15

final rule

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

Effective: Nov 12, 1997 Category: aircraft

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

97-20-15

final rule

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

Effective: Nov 12, 1997 Category: aircraft

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

97-20-15

final rule

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

Effective: Nov 12, 1997 Category: aircraft

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

Amdt-39-10151

final rule

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

Unsafe Condition: could result in loss of in-plane stability of the main rotor blade and subsequent loss of control of the helicopter.

Effective: Nov 12, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

97-10-16

final rule

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

Effective: Jun 27, 1997 Category: aircraft

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

Amdt-39-10029 Recurring

final rule

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: This amendment supersedes an existing airworthiness directive (AD), applicable to 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...

Effective: Jun 27, 1997 Category: aircraft

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

Amdt-39-9252

final rule

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

Unsafe Condition: could result in loss of in-plane stability of the main rotor blade and subsequent loss of control of the helicopter.

Effective: Jun 23, 1995 Category: aircraft

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

90-15-01

final rule

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

Effective: Mar 7, 1991 Category: aircraft

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

90-15-01

final rule

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

Effective: Mar 7, 1991 Category: aircraft

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

90-15-01

final rule

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

Effective: Mar 7, 1991 Category: aircraft

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

90-15-01

final rule

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

Effective: Mar 7, 1991 Category: aircraft

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

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