73-12-03 R1: Engine Mounting Foot Stud
FAA order 73-12-03 R1 is an airworthiness directive in force since December 10, 1981. The FAA's subject line: Engine Mounting Foot Stud. It names the Rolls-Royce DART 542 engine: about 1 aircraft on the U.S. register today, 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 Deutschland Ltd & Co KG
- Models
- Dart 542-10, Dart 542-10J, Dart 542-10K
- Engine series
- Rolls-Royce DART 542 1 aircraft
Dates and paperwork
- In force since
- December 10, 1981
- 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 (1,666 characters)
73-12-03 R1 ROLLS ROYCE LTD: Amendment 39-1652 as amended by Amendment 39-4277. Applies to Rolls-Royce DART engine models 542-10, 542-10J, and 542-10K which do not have Rolls-Royce, Ltd., Modification No. 1681 and Modification No. 1768 incorporated, as installed on, but not limited to, NAMC YS-11 airplanes.
Compliance is required as indicated.
To detect engine mounting foot cracks, and engine mounting foot stud fractures, looseness, and loose nuts, accomplish the following:
(a) Within the next 400 hours time in service after the effective date of this AD, or within 400 hours time in service since the last inspection, whichever occurs sooner, and thereafter at intervals not to exceed 400 hours time in service since the last inspection, inspect engine top mounting feet which do not incorporate Modification 1681 and side mounting feet which do not incorporate Modification 1768 for cracks and the mounting feet studs for fracture, looseness, and loose nuts, in accordancewith Rolls-Royce Service Bulletin Da72-384, Revision 2, dated September 1979.
(b) If any engine mounting feet are found cracked or any engine mounting feet studs are found to have loose nuts, or to be loose or fractured during an inspection required by paragraph (a), before further flight, repair in accordance with Rolls Royce Service Bulletin Da72-384 Revision 2, dated September 1979 or an FAA- approved equivalent.
NOTE: Rolls-Royce DART Service Bulletins Da72-411 and Da72-444 concern Modification No. 1681 and Modification No. 1768, respectively.
Amendment 39-1652 became effective July 1, 1973.
This amendment 39-4277 becomes effective December 10, 1981.
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/73-12-03 R1.json · aircraft systems.