# AD 62-26-02: Integral Tanks

- Type: Airworthiness directive
- Status: Current
- Products: Gulfstream Aerospace G-159
- Effective: December 6, 1962
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/752907FFDEA894DE862569B5006F2C87.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/62-26-02

## The airworthiness directive

62-26-02 GRUMMAN: Amdt. 513 Part 507 Federal Register December 6, 1962. Applies to Model G-159 Aircraft Serial Numbers 1 through 93, Except Numbers 75 and 76, and to Aircraft Serial Number 114.

Compliance required as indicated.

Abnormal fuel system operation has caused structural damage to the wing area of Grumman Model G-159 airplanes. As this condition is likely to exist on other airplanes of the same type design, accomplish the following:

  (a) Unless already accomplished, the following inspection is required prior to further flight, except that if the airplane is presently located at a base where the equipment and personnel necessary to conduct such an inspection are not available, the airplane may be ferried without passengers to a base where such equipment and personnel are available:

  (1) Defuel the left and right wing tanks.

  (2) Remove the inspection covers in the upper surface of the wings between the fuselage and the nacelle and between the nacelle and the fuel filler caps.

  (3) Inspect for damage to the wing structure in the integral tanks. Pay particular attention to the three top and three bottom rivets in the vertical stiffeners on the ribs.

  (b) Unless already accomplished, the following repair for damaged aircraft and the following modification for all aircraft are required prior to further flight except that if the damage is confined to the stiffener and rib attachments, the airplane may be operated under a special flight permit (CAR 1.76) to a base where the repair and modification may be made:

  (1) Repair damage in accordance with Grumman FAA approved instructions or equivalent approved by Chief, Engineering and Manufacturing Branch, FAA Eastern Region, New York International Airport, New York.

  (2) Modifying by removing the fuel vent flow valve Parker P/N 119-578735 from each tank and drilling a 5/32-inch diameter hole in the valve body in accordance with Grumman Gulfstream Service Change No. 154. After brush-coating the hole with EC-776 or FAA approved equivalent, reinstall the valve.

NOTE. - Aircraft Serial Nos. 1, 7, 12, 26 and 91 already incorporate this modification. (Grumman telegram dated November 12, 1962, to all Gulfstream operators and Grumman Service Change No. 154 cover this same subject.)

This directive effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated November 15, 1962.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A17](https://openairdocs.org/tcds/1A17): Gulfstream Aerospace Corporation; names 1 of 1 models: G-159

## 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: 5 (5 by airframe model, 0 by engine model)
- Makers: Grumman 4, Grumman American Avn. 1

Models with the most aircraft:

- [Grumman G-159](https://openairdocs.org/model/grumman-g-159): 4 aircraft (airframe model)
- [Grumman American Avn. G-159](https://openairdocs.org/model/grumman-american-avn-g-159): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/62-26-02/models.md
Every aircraft: https://openairdocs.org/ad/62-26-02/aircraft.md

Its text cites no advisory circulars or STCs.

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