# AD 78-12-02: Exhaust System Bellows Assembly

- Type: Airworthiness directive
- Status: Current
- Products: British Aerospace, Aircraft Group B.206 Series 2
- Effective: June 22, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3230
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1C6E8C3BDFF6951786256A34005C1745.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-12-02

## The airworthiness directive

78-12-02 SCOTTISH AVIATION LIMITED: Amendment 39-3230. Applies to "Beagle" Model B206 Series II airplanes, certificated in all categories, which have exhaust system bellows assembly, P/N CE20901 or P/N CE 20806, installed.

Compliance required as indicated, unless already accomplished.

To minimize the possibility of hot exhaust gases escaping from a fractured exhaust bellows assembly and impinging on the tachometer electrical leads and other engine compartment components, accomplish the following: (a) Within the next 25 hours time in service after the effective date of this AD, inspect the exhaust system bellows assemblies, Part Number CE 20901 and Part Number CE 20806, for cracks, corrosion, and deterioration in accordance with paragraph 3(a) of Scottish Aviation Limited Service Bulletin No. B206/55 Issue 2, dated January 5, 1976, or an FAA approved equivalent, (hereinafter referred to as the Service Bulletin).

  (b) If a crack, corrosion, or deterioration is not found during the inspection required by paragraph (a) of this AD -

  (1) Within 50 hours time in service after the inspection required by paragraph (a) of this AD and, thereafter, at intervals not to exceed 50 hours time in service, inspect the bellows assemblies in accordance with paragraph 3(b) of the Service Bulletin; and

  (2) Within 100 hours time in service, or 3 months after the inspection required by paragraph (a), whichever occurs sooner, and, thereafter, at intervals not to exceed 100 hours time in service or 3 months, whichever occurs sooner, inspect the bellows assemblies in accordance with paragraph 3(a) of the Service Bulletin.

  (c) If a crack, corrosion, or deterioration is found during any inspection required by this AD, replace the affected bellows assembly with a serviceable part of the same part number.

  (d) For bellows assemblies installed as replacements -

  (1) Within 50 hours time in service after installation and, thereafter, at intervals not to exceed 50 hours time in service, inspect the bellows assemblies in accordance with paragraph 3(b) of the Service Bulletin;

  (2) Within 200 hours time in service, or 6 months, after installation, whichever occurs sooner, and, thereafter, at intervals not to exceed 100 hours time in service or 3 months, whichever occurs sooner, inspect the bellows assemblies in accordance with paragraph 3(a) of the Service Bulletin.

This amendment becomes effective June 22, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A11EU](https://openairdocs.org/tcds/A11EU): British Aerospace Aircraft Group; names 1 of 2 models: B.206 Series 2

## 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: 2 (2 by airframe model, 0 by engine model)
- Makers: Beagle 2

Models with the most aircraft:

- [Beagle B.206 SERIES 2](https://openairdocs.org/model/beagle-b-206-series-2): 2 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/78-12-02/models.md
Every aircraft: https://openairdocs.org/ad/78-12-02/aircraft.md

Its text cites no advisory circulars or STCs.

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