# AD 62-24-02: Hydraulic System Motor Operated Valves

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-200, 707-300 Series, 707-300B Series, 707-300C Series, 707-400 Series, 720 Series and 720B Series
- Effective: November 10, 1962
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9FCF5F718AFFDA0F862569910071D2B4.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/62-24-02

## The airworthiness directive

62-24-02 BOEING: Amdt. 506 Part 507 Federal Register November 10, 1962. Applies to 707/720 Airplanes, Serial Nos. 18385-18397, 18400-18404, 18374, 18414-18419, 18411, 18372, 18373, 18335-18339, 18079-18082, 18423-18425, 18376, 18377, 18451-18453 Inclusive; Also Applies to Airplanes Which Have Been Modified By Operators to Incorporate Motor Operated Valves Per Boeing Service Bulletins 1414, 1483, 1484, 1489, 1490, 1491, 1492 and 1493. Compliance required within 350 hours of airplane time in service after the effective date of this directive, unless already accomplished. Hydraulic system motor operated valves, Whittaker P/N 146505-1, incorporated in both the utility and auxiliary hydraulic systems, have failed in service due to stress corrosion in the end cover retaining nut. All failures have occurred in parts with the original heat treatment. To prevent such failures: (1) Modify all valves by installing new end covers and nuts of the same Whittaker part number but identified by a blue anodized color; and (2) Replace the valve shear seals and the bearing with new longer seals and a new bearing. (Whittaker Service Bulletin SBC 2021 covers this same subject.) This directive effective November 10, 1962.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A21](https://openairdocs.org/tcds/4A21): The Boeing Company; names 4 of 4 models: 707-100B Short Body, 707-200, 707-100 Long Body, 707-100B Long Body
- [TCDS 4A26](https://openairdocs.org/tcds/4A26): The Boeing Company; names 4 of 4 models: 707-300B Series, 707-400 Series, 707-300 Series, 707-300C Series
- [TCDS 4A28](https://openairdocs.org/tcds/4A28): The Boeing Company; names 2 of 2 models: 720B Series, 720 Series

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 707-338C](https://openairdocs.org/model/boeing-707-338c): 2 aircraft (airframe model)
- [Boeing 707-368C](https://openairdocs.org/model/boeing-707-368c): 1 aircraft (airframe model)
- [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 aircraft (airframe model)
- [Boeing 707-323B](https://openairdocs.org/model/boeing-707-323b): 1 aircraft (airframe model)
- [Boeing 707-351B](https://openairdocs.org/model/boeing-707-351b): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/62-24-02/models.md
Every aircraft: https://openairdocs.org/ad/62-24-02/aircraft.md

Its text cites no advisory circulars or STCs.

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