# AD 81-04-01: Rudder Cable Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Hiller UH-12D, UH-12L and UH-12E
- Effective: February 9, 1981
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-4034
- Registered aircraft: 128 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FD174B407456553386256A4E0046B089.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-04-01

## The airworthiness directive

81-04-01 HILLER AIRCRAFT: Amendment 39-4034. Applies to Models UH-12D, UH-12E, OH-23G, UH-12L, and all models converted to turbine power in accordance with Supplementary Type Certificate STC 177WE or STC 178WE, certified in all categories.

Compliance required within ten (10) calendar days from the effective date of this AD, unless already accomplished.

To prevent rudder balance cables from fraying and breaking, accomplish the following:

  (a) Perform a one time visual inspection of the rudder balance cable assembly, P/N HS 1053-2, in accordance with Hiller Service Bulletin No. 32-2 Part II, Accomplishment Instructions, Subparts A and B, dated December 31, 1980.

  (b) Remove from service the rudder cable assemblies, P/N HS 1053-2, which do not conform to type design. Type design is 7 x 19 cable. The Hiller Service Bulletin No. 32-2 depicts the acceptable cable.

  (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes or helicopters to a base for the accomplishment of inspections or modifications required by this AD.

  (d) Alternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region.

This amendment becomes effective February 9, 1981.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4H10](https://openairdocs.org/tcds/4H10): Siam Hiller Holdings Inc.; names 1 of 1 models: UH-12D
- [TCDS 4H11](https://openairdocs.org/tcds/4H11): Siam Hiller Holdings Inc.; names 1 of 2 models: UH-12E
- [TCDS H1WE](https://openairdocs.org/tcds/H1WE): Siam Hiller Holdings Inc.; names 1 of 2 models: UH-12L

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 128 (128 by airframe model, 0 by engine model)
- Makers: Hiller 125, Hiller-Osborn 2, Hiller-Rogerson Helicopter 1

Models with the most aircraft:

- [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e): 103 aircraft (airframe model)
- [Hiller UH-12D](https://openairdocs.org/model/hiller-uh-12d): 22 aircraft (airframe model)
- [Hiller-Osborn UH-12D](https://openairdocs.org/model/hiller-osborn-uh-12d): 2 aircraft (airframe model)
- [Hiller-Rogerson Helicopter UH12E](https://openairdocs.org/model/hiller-rogerson-helicopter-uh12e): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/81-04-01/models.md
Every aircraft: https://openairdocs.org/ad/81-04-01/aircraft.md

Its text cites no advisory circulars or STCs.

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