AD 60-24-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Model 188 Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Model 188 Aircraft |
Unsafe Condition
Possible over-pressurization of fuel tanks during refueling due to absence of pressure relief overflow valves.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install pressure relief overflow valves (Lockheed P/N 634114-7 or -9) in each fuel tank unless already accomplished, as per Lockheed Service Bulletin 188/SB-422.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 5,000 hours' time in service after the effective date of this directive
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Model 188A and 188C aircraft, all serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Pressure Relief Valve
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-24-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-24-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 188 Aircraft Subject: Fuel Pressure Relief Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/13/1960 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Lockheed Martin Corporation Model: 188A | 188C Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-24-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-24-01 SUBJECT HEADING: LOCKHEED Model 188 Aircraft ACTION: SUMMARY: DATES: Effective December 13, 1960. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-24-01 LOCKHEED: Amdt. 222 Part 507 Federal Register November 15, 1960. Applies to All 188 Aircraft. Compliance required within 5,000 hours' time in service after the effective date of this directive. To provide protection against possible over-pressurization of fuel tanks during refueling, the following modification is required unless already accomplished: Install pressure relief overflow valves in each fuel tank. Lockheed overflow valves P/N 634114-7 or -9 are satisfactory for this purpose. (Lockheed Service Bulletin 188/SB-422 covers this subject.) This directive effective December 13, 1960. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_60-24-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-24-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 188 Aircraft Subject: Fuel Pressure Relief Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/13/1960 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: 60-24-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-24-01 SUBJECT HEADING: LOCKHEED Model 188 Aircraft ACTION: SUMMARY: DATES: Effective December 13, 1960. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-24-01 LOCKHEED: Amdt. 222 Part 507 Federal Register November 15, 1960. Applies to All 188 Aircraft. Compliance required within 5,000 hours' time in service after the effective date of this directive. To provide protection against possible over-pressurization of fuel tanks during refueling, the following modification is required unless already accomplished: Install pressure relief overflow valves in each fuel tank. Lockheed overflow valves P/N 634114-7 or -9 are satisfactory for this purpose. (Lockheed Service Bulletin 188/SB-422 covers this subject.) This directive effective December 13, 1960. 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.