46-23-01: Muffler Replacement
FAA order 46-23-01 is an airworthiness directive. The FAA's subject line: Muffler Replacement. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Univair Aircraft Corporation
- Models
- 415-C, 415-CD, 415-D
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 (440 characters)
46-23-01 ERCO: (Was Mandatory Note 4 of AD-718-6.) Applies Only to 415-C, -CD and -D Aircraft Serial Numbers 113 to 362, Inclusive.
To be accomplished within next 50 hours of operation.
Trouble in service has indicated the necessity for replacing the original muffler on the serial numbers listed above with a new muffler, Erco P/N 145-40517.
(Erco Service Department Memorandum No. 7 dated February 1, 1946, covers this same subject.)
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/46-23-01.json · aircraft systems.