# AD 73-12-12: Power Plant Fire Extinguisher

- Type: Airworthiness directive
- Status: Current
- Products: Vickers-Armstrongs Viscount 810
- Effective: July 6, 1973
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1661
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/63F7ACEF744A6D9D862569A4006CD622.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/73-12-12

## The airworthiness directive

73-12-12 BRITISH AIRCRAFT CORPORATION: Amdt. 39-1661. Applies to Viscount Series 810 airplanes.

Compliance is required as indicated.

To prevent a possible restriction in a power plant fire extinguisher pipe accomplish the following:

Within the next 500 hours' time in service after the effective date of this AD, unless already accomplished within 5 years prior to the effective date of this AD, and thereafter at intervals not to exceed 5 years from the last replacement, replace the rubber seal sleeves P/N FRS.-F-Series 1, installed in the power plant fire extinguisher system in the pipe connector assembly located at the engine fire-proof bulkhead, with seal sleeves of the same part number.

(BAC Alert Preliminary Technical Leaflet No. 149, Issue 1, dated July 30, 1971, covers this same subject).

This Amendment becomes effective July 6, 1973.

## 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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