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FAA
Federal Aviation Administration Department of Transportation
Aviation Safety
AIRWORTHINESS DIRECTIVE
Generated by Aircraft-logs.com — March 26, 2026

AD 47-02-01 ACTIVE

Exhaust Collector Rings
Key Information
AD Number 47-02-01 Status Active
Effective Date Not specified Issue Date Not specified
Docket Number Unknown Amendment N/A
Product Type ["Aircraft"] Product Subtype ["Large Airplane"]
CFR Part --- - Part 39 CFR Section N/A
Citation This information is not available.
Applicability
Manufacturer(s) The Boeing Company
Model(s) C54-DC C54A-DC C54B-DC C54D-DC C54E-DC C54G-DC DC-4
Regulatory Text

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.)

AD 47-02-01 — Exhaust Collector Rings
Printed from Aircraft-logs.com — 03/26/2026