AD 63-21-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Air Trading Corporation | Lockheed Aircraft Corporation | Navy PV-1 | LOCKHEED Models L-18 and PV-1 Airplanes |
| aircraft | Air Trading Corporation | Lockheed Aircraft Corporation | 18 | LOCKHEED Models L-18 and PV-1 Airplanes |
Unsafe Condition
Runaway operation of the electrically operated trim tab actuators
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Electrically deactivate the elevator trim tab within 30 hours' time in service after the effective date. Reactivation requires compliance with STC SA2-183 or an FAA-approved modification to actuation speed and limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 30 hours' time in service after the effective date
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Affected Aircraft
Lockheed Models L-18 and PV-1 airplanes equipped with Spartan electrically actuated elevator trim tabs
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Federal Register Abstract
Elevator Trim Tabs
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_63-21-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 63-21-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models L-18 and PV-1 Airplanes Subject: Elevator Trim Tabs Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/10/1964 Make: Air Trading Corporation | Lockheed Aircraft Corporation Model: Navy PV-1 | 18 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 63-21-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 63-21-04 SUBJECT HEADING: LOCKHEED Models L-18 and PV-1 Airplanes ACTION: SUMMARY: DATES: Effective January 10, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_63-21-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 63-21-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models L-18 and PV-1 Airplanes Subject: Elevator Trim Tabs Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/10/1964 Make: Air Trading Corporation | Lockheed Aircraft Corporation Model: Navy PV-1 | 18 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 63-21-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 63-21-04 SUBJECT HEADING: LOCKHEED Models L-18 and PV-1 Airplanes ACTION: SUMMARY: DATES: Effective January 10, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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