# AD 59-14-01: Utility Hydraulic System

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 707-100 Long Body, 707-100B Long Body and 707-100B Short Body
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C770DB56A82F0EA58625682A0065EEAA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/59-14-01

## The airworthiness directive

59-14-01 BOEING: Applies to the following Boeing 707-100 Series Aircraft Serial Numbers 17586 through 17591, 17609, 17628 through 17637 and 17658 through 17662. Compliance required as indicated. As a result of the complete loss of hydraulic fluid in the utility hydraulic system of a 707- 100 series aircraft caused by the rupture of the aluminum tube assembly in the nose wheel well door-open system, the following modification shall be accomplished. Prior to July 31, 1959, the nose wheel door-open aluminum tube assembly 50-6848-45 shall be replaced with corrosion resistant steel tubing 3/8 inch O.D. by 0.028 inch wall thickness. (Boeing Service Bulletin No. 412 pertains to this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A21](https://openairdocs.org/tcds/4A21): The Boeing Company; names 3 of 4 models: 707-100B Short Body, 707-100 Long Body, 707-100B Long Body

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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