59-05-05: Cyclic Control Scissor Casting
FAA order 59-05-05 is an airworthiness directive. The FAA's subject line: Cyclic Control Scissor Casting. It names Hiller UH-12: about 217 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Hiller Aviation; Siam Hiller Holdings, Inc.
- Models
- UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E
- On this site
- Hiller UH-12 217 registered
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (1,262 characters)
59-05-05 HILLER: Applies As Follows: (a) UH-12, UH-12A, and UH-12B Incorporating Hiller Service Bulletin Numbers 50 or 50A After July 1, 1957. (b) UH-12C, Serial Numbers 934 and Up. (c) UH-12D, All Serial Numbers. (d) All Spare P/N 34141 Castings Delivered By Hiller After July 1, 1957. All UH-12 Series and All Serial Numbers Incorporating These Spares Are Affected.
Compliance required as indicated.
Due to improper casting techniques, two cyclic control scissor castings, P/N 34141, have failed in service on Model H-23D helicopters. As there is a possibility that additional P/N 34141 castings are defective, the following measure are required to detect cracks and prevent further failures:
(1) Prior to every flight and refueling, visually inspect P/N 34141 casting for cracks if part has accumulated more than 275 hours. If cracks are detected, the part must be removed from service prior to further flight.
(2) Effective September 1, 1959, P/N 34141 casting (including basic number and all dash numbers) must be removed from service prior to accumulation of 275 hours total time.
(3) Upon replacement with a new forging P/N 34158, the special inspection of item (1) may be discontinued. This forging has unlimited service life.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/59-05-05.json · aircraft systems.