# AD 86-16-09: Hydraulic Cut Out Valve

- Type: Airworthiness directive
- Status: Current
- Products: Vickers-Armstrongs Viscount 810
- Effective: September 8, 1986
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-5377
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2DE87A61274CB655862569EB00615C00.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/86-16-09

## The airworthiness directive

86-16-09 BRITISH AEROSPACE VISCOUNT: Amendment 39-5377. Applies to Vickers Viscount Model 800 series airplanes, certificated in any category. Compliance is required as indicated, unless previously accomplished. To prevent nose landing gear collapse as a result of a faulty hydraulic cut out valve, accomplish the following:

A. Within the next 1,000 hours time-in-service or nine months after the effective date of this AD, whichever occurs first, modify the cut out valve, Part Number AIR 41916, in accordance with Automotive Products Modification Standard SA 3490, dated December 16, 1959 (reference BAe Technical News Sheet No. 232, Issue 1, dated August 5, 1985).

B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 tooperate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.

All persons affected by this directive, who have not already received the appropriate service document from the manufacturer, may obtain copies upon request to British Aerospace, Inc., Box 17414, Dulles International Airport, Washington, D.C. 20041. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment becomes effective September 8, 1986.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 1 of 3 models: Viscount 810

## 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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