# AD 60-24-01: Fuel Pressure Relief Valve

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed Martin 188A and 188C
- Effective: December 13, 1960
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0B5A85F800BF61E2862569B200719420.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/60-24-01

## The airworthiness directive

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.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A22](https://openairdocs.org/tcds/4A22): Lockheed Martin Corporation; names 2 of 2 models: 188A, 188C

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 4 (4 by airframe model, 0 by engine model)
- Makers: Lockheed 4

Models with the most aircraft:

- [Lockheed 188C](https://openairdocs.org/model/lockheed-188c): 3 aircraft (airframe model)
- [Lockheed 188A](https://openairdocs.org/model/lockheed-188a): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/60-24-01/models.md
Every aircraft: https://openairdocs.org/ad/60-24-01/aircraft.md

Its text cites no advisory circulars or STCs.

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