48-18-04: Supercharger Bearing Thermocouple
FAA order 48-18-04 is an airworthiness directive. The FAA's subject line: Supercharger Bearing Thermocouple. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Lockheed Aircraft Corporation
- Models
- 49-46
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 (464 characters)
48-18-04 LOCKHEED: Applies to Model 49-46 Aircraft Serial Numbers 1975 Through 1980 and 2021 Through 2088.
Compliance with the following was required prior to September 19, 1947, by direct notification of operators.
Add thermocouple to cabin supercharger bevel gear housing, and direct reading indicator in cockpit to record temperatures of the rear supercharger universal coupling support bearing.
(LAC Service Bulletin 49/SB-390 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/48-18-04.json · aircraft systems.