47-10-10: Voltage Regulator Soundproofing
FAA order 47-10-10 is an airworthiness directive. The FAA's subject line: Voltage Regulator Soundproofing. System: electrical power.
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 (294 characters)
47-10-10 LOCKHEED: (Was Mandatory Note 12 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088.
Compliance required immediately.
Remove all soundproofing pads adjacent to and surrounding the voltage regulators.
(LAC Service Bulletin 49/SB-171 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/47-10-10.json · aircraft systems.