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63-21-04: Elevator Trim Tabs

FAA order 63-21-04 is an airworthiness directive in force since January 10, 1964. The FAA's subject line: Elevator Trim Tabs. It names Air & Space America Inc 18, Lockheed 18: about 19 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: flight controls.

What it applies to as the FAA lists it

Kind of product
Aircraft
Makes
Air Trading Corporation; Lockheed Aircraft Corporation
Models
Navy PV-1, 18
On this site
Air & Space America Inc 18 6 registered
Lockheed 18 13 registered

Dates and paperwork

In force since
January 10, 1964
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 (985 characters)
63-21-04 LOCKHEED: Amdt. 625 Part 507 Federal Register October 2, 1963. Applies to All Models L-18 and PV-1 Airplanes Equipped With Spartan Electrically Actuated Elevator Trim Tabs. Compliance required as indicated. To prevent runaway operation of the electrically operated trim tab actuators, accomplish the following: (a) Within 30 hours' time in service after the effective date of this AD unless already accomplished, electrically deactivate the elevator trim tab. (b) Any tab deactivated may be reactivated when one of the following has been accomplished: (1) On any Lockheed Model 18 airplane with Spartan electrically actuated elevator trim tab, the trim tab installation is made in accordance with STC SA2-183. (2) An FAA approved modification to the speed and limits of actuation is accomplished. Modifications must be approved by the Chief of an FAA Engineering and Manufacturing Branch. This directive effective November 1, 1963. Revised January 10, 1964.

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 October 5, 2026. Connections as data: /graph/directive/63-21-04.json · aircraft systems.