81-24-09: Propeller Performance
FAA order 81-24-09 is an airworthiness directive in force since December 28, 1981. The FAA's subject line: Propeller Performance. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Lockheed Martin Corporation
- Models
- 188A, 188C
Dates and paperwork
- In force since
- December 28, 1981
- 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 (743 characters)
81-24-09 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-4267. Applies to Lockheed Model 188A and 188C Series airplanes, certificated in all categories.
Compliance required within 30 days after the effective date of this AD, unless already accomplished.
To prevent a reduction in performance which could result in a hazardous condition, incorporate in the Limitations Section of the FAA-Approved Airplane Flight Manual a revision which specifies that all takeoffs and approaches must be performed with the synchronization control in the following position:
For Hamilton Standard Propellers -
SYNC MASTER switch-OFF
For Aeroproducts Propellers -
Synchronizer switch-SYNCH OFF.
This amendment becomes effective December 28, 1981.
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/81-24-09.json · aircraft systems.