- Author
- U.S. Department of Transportation
- Title
- Airworthiness Directives; Pratt and Whitney Aircraft Model JT9D Engines.
- Coporate
- Department of Transportation, Washington, DC
- Journal
- Federal Register, Vol. 40, No. 41, 85449-8545, Friday, February 28. 1975
- Keywords
- airworthiness | aircraft engines