81-25-01: Flyweights

FAA order 81-25-01 is an airworthiness directive in force since December 7, 1981. The FAA's subject line: Flyweights. It names Maule M-5: about 364 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: propeller.

What it applies to as the FAA lists it

Kind of product: Appliance
Makes: Maule Aerospace Technology, Inc.; Woodward Governor Company
Models: M-5-235C, Flyweights
On this site: Maule M-5 364 registered

Dates and paperwork

In force since: December 7, 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 (825 characters)

81-25-01  WOODWARD GOVERNOR COMPANY:  Amendment 39-4269.  Applies to Model F210681 Serial Numbers 1446751 through 1446783, 1446785 through 1446806, 1446808, 1446809, 1446811, 1446812, 1446814 through 1446817, 1567547 through 1567562, 1567564 through 1567594, and 1567596 through 1567612 installed on Maule M5 235C airplanes. 

	Compliance is required as indicated, unless already accomplished.  To prevent the possible failure of the flyweights, accomplish the following: 

	Within the next 50 hours time in service from the effective date of this AD, remove Woodward Governor Model 
F210681 with the above listed serial numbers and replace with a Woodward Governor Model F210681 S/N not listed above in accordance with Woodward Service Bulletin 33576 dated October 1981. 

	This amendment becomes effective December 7, 1981.

Related safety bulletins advice on the same designs, not orders

2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM

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/81-25-01.json · aircraft systems.