47-51-04: Propeller Antiheat Shield
FAA order 47-51-04 is an airworthiness directive. The FAA's subject line: Propeller Antiheat Shield. It names Curtiss Wright C-46: about 8 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Airlift International, Inc.; Curtiss-Wright Corporation; Flying Tiger Line, Inc.; L. B. Smith Aircraft Corporation; Skyways International Trading and Transport Co.; Tempo Design Corporation
- Models
- C-46A, C-46D, C-46F, C-46R, C-46E, C-46A, C-46D, C-46E, C-46F, C-46A, C-46D, C-46F, C-46F, C-46/CW20-T, Super C-46/CW20-T
- On this site
- Curtiss Wright C-46 8 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 (1,207 characters)
47-51-04 CURTISS-WRIGHT Applies to All C-46 Series Airplanes Incorporating Hamilton Standard Propellers. \n\n\tCompliance required by March 1, 1948. \n\n\tTo eliminate failure of the propeller flexible feathering line, an antiheat shield shall be installed in accordance with the following instructions: \n\n\t(a)\tRemove the engine cowling adjacent to the propeller feathering line and inspect the flexible propeller feathering hose and lagging material (if installed) for disintegration and deterioration. Replace hose if deterioration is evident. \n\n\t(b)\tFabricate the antiheat shield and attaching clamps as shown in Figure 1. \n\n\t(c)\tPlace antiheat shield over the flexible hose and mount the shield on the engine mount by use of the clamps shown in Figure 1. The shield should be centered over the flexible hose. It may be necessary to rebend the metal feathering line slightly to achieve proper centering. \n\n\t(d)\tUpon completion of installation, check operation of propeller feathering system. \n\n\t(The above information is also contained in Army Air Forces Technical Order 01-25L- 105 dated April 2, 1947. Copies of this Technical Order are not available for distribution by the FAA.)
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/47-51-04.json · aircraft systems.