# AD 59-26-02: Two Fuel Cell Vent Tubes

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-24 and PA-24-250
- Published: December 19, 1959
- Issued: December 14, 1959
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,567 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0E09890073926807862569990050837A.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/59-26-02

## The airworthiness directive

59-26-02 PIPER: Applies to PA-24 and PA-24 "250" Airplanes Serial Numbers 24-1 To 24-1373 Inclusive.

Compliance required by January 15, 1960.

To prevent clogging, the two fuel cell vent tubes which are located under the wings shall be modified in the following manner:

Measure a distance of 1/2-inch down from the bottom of the wing skin along the forward side of each protruding vent tube. At this point, cut the tube off at a 45-degree angle to the bottom skin so that the end of the tube remains square.

(Piper Immediate Action Service Bulletin No. 180 covers this subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A15](https://openairdocs.org/tcds/1A15): Piper Aircraft Inc.; names 2 of 4 models: PA-24, PA-24-250

## 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: 1,567 (1,567 by airframe model, 0 by engine model)
- Makers: Piper 1,567

Models with the most aircraft:

- [Piper PA-24-250](https://openairdocs.org/model/piper-pa-24-250): 1,222 aircraft (airframe model)
- [Piper PA-24](https://openairdocs.org/model/piper-pa-24): 345 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/59-26-02/models.md
Every aircraft: https://openairdocs.org/ad/59-26-02/aircraft.md

Its text cites no advisory circulars or STCs.

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