47-02-01: Exhaust Collector Rings
FAA order 47-02-01 is an airworthiness directive. The FAA's subject line: Exhaust Collector Rings. It names Douglas C-54: about 7 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
- Aircraft
- Makes
- The Boeing Company
- Models
- C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
- On this site
- Douglas C-54 7 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 (527 characters)
47-02-01 DOUGLAS: (Was Mandatory Note 9 of AD-762-7.) Applies to C-54 and DC-4 Aircraft. \n\n\tTo be accomplished at next engine change. \n\n\tReplace present low carbon steel bolts and brass nuts on exhaust collector rings with stainless steel bolts and nuts. This change is necessary in order to eliminate stretching of these bolts, corrosion, and other maintenance problems connected with the present type bolts used in the exhaust collector system. \n\n\t(Douglas Service Bulletin DC-4 No. 10 covers this same subject.)
Related safety bulletins advice on the same designs, not orders
2014-11-24NM-15-03 · Flight Controls
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/47-02-01.json · aircraft systems.