68-12-06: Compressor Blades
FAA order 68-12-06 is an airworthiness directive in force since June 18, 1968. The FAA's subject line: Compressor Blades. It names the Rolls-Royce 250-C18, Rolls-Royce 250-C47 series engines: about 17 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Engine
- Makes
- Rolls-Royce Corporation
- Models
- 250-C10B (T63-A-5A), 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19
- Engine series
- Rolls-Royce 250-C18 1 aircraft
Rolls-Royce 250-C47 series 16 aircraft
Dates and paperwork
- In force since
- June 18, 1968
- 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 (765 characters)
68-12-06 ALLISON: Amdt. 39-612. Applies to Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250- C19 and 250-C10B engines.
Before further flight of any aircraft equipped with one of the Allison model engines listed above, unless already accomplished, modify the sixth stage compressor blades in these engines in accordance with Allison Commercial Engine Bulletin No. 250 CEB-48, dated June 11, 1968, or any other method approved by the Chief, Engineering and Manufacturing Branch, Central Region.
Further flight beyond the point where an aircraft equipped with one of these engines is grounded pursuant to this Airworthiness Directive, may be conducted only in accordance with Federal Aviation Regulation 21.197.
This amendment becomes effective June 18, 1968.
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 2, 2026. Connections as data: /graph/directive/68-12-06.json · aircraft systems.