# AD 88-22-02: Rfm Revisions

- Type: Airworthiness directive
- Status: Current
- Products: Airbus Helicopters Deutschland MBB-BK 117 A-1, MBB-BK 117 A-3 and MBB-BK 117 A-4
- Effective: November 16, 1988
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-6043
- Docket: 87-ASW-61
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/42D3878EE13FCAA186256A4E00557BA4.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/88-22-02

## The airworthiness directive

88-22-02 MESSERSCHMITT-BOLKOW-BLOHM (MBB): Amendment 39-6043. Applies to Model BK-117A-1, BK-117A-3, and BK-117A-4 helicopters, all serial numbers, certificated in all categories, equipped with Lycoming Model LTS-101 series engines (Docket 87- ASW-61).

Compliance is required within the next 50 hours' time in service after the effective date of this AD, unless already accomplished.

To provide the flightcrew with emergency engine shut down instructions to be followed in event of an impending engine turbine burst, insert the following updates (or the forthcoming permanent equivalent revisions) into the applicable FAA-approved flight manual.

  (a) For the Model BK-117A-1 and BK-117A-3 helicopters, insert into the applicable Rotorcraft Flight Manual--MBB Temporary Revision 5, dated July 27, 1987.

  (b) For the Model BK-117A-4 helicopter, insert into the applicable Rotorcraft Flight Manual--MBB Temporary Revision 1, dated July 27, 1987.

  (c) Upon request, an alternate means of compliance which provides an equivalent level of safety with the requirements of this AD may be used when approved by the Manager, Rotorcraft Directorate, Aircraft Certification Service, ASW-100, FAA, Fort Worth, Texas 76193-0100.

This amendment, 39-6043, becomes effective November 16, 1988.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H13EU](https://openairdocs.org/tcds/H13EU): Airbus Helicopters Deutschland GmbH (AHD); names 3 of 9 models: MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 A-1

## 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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