AD 81-24-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes |
Unsafe Condition
A reduction in performance which could result in a hazardous condition due to improper synchronization control position during takeoffs and approaches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate a revision in the Limitations Section of the FAA-Approved Airplane Flight Manual specifying that all takeoffs and approaches must be performed with the synchronization control in the specified position: SYNC MASTER switch-OFF for Hamilton Standard Propellers and Synchronizer switch-SYNCH OFF for Aeroproducts Propellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 30 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed-CALIFORNIA COMPANY Models 188A and 188C Series airplanes, certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Propeller Performance
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_81-24-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-24-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes Subject: Propeller Performance Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/28/1981 Make: Lockheed Martin Corporation Model: 188A | 188C Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 81-24-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4267 AD NUMBER: 81-24-09 SUBJECT HEADING: LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes ACTION: SUMMARY: DATES: Effective December 28, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_81-24-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-24-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes Subject: Propeller Performance Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/28/1981 Make: Lockheed Martin Corporation Model: 188A | 188C 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: 81-24-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4267 AD NUMBER: 81-24-09 SUBJECT HEADING: LOCKHEED-CALIFORNIA COMPANY Models 188A and 188C Series Airplanes ACTION: SUMMARY: DATES: Effective December 28, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...
2018-11-02
final ruleAirworthiness Directives; Lockheed Martin Corporation/Lockheed Martin Aeronautics Company
Unsafe Condition: Aileron control rod assemblies, which contain the discrepant part, do not provide adequate load carrying capabilities due to the missing 7/8-inch internal threads in the bore of the aileron control...
2015-22-07
final ruleAirworthiness Directives; Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Airplanes
Unsafe Condition: The circumferential fuselage splice at fuselage-station (FS) 695 is subject to widespread fatigue damage (WFD), which could lead to loss of residual strength and rapid decompression of the cabin.
2015-20-01 Recurring
final ruleAirworthiness Directives; Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Airplanes
Unsafe Condition: The left and right lower surface panels of the wings are subject to widespread fatigue damage (WFD), which could result in reduced structural integrity of the airplane.