Superseded by EASA AD 2019-0208
Superseded. Comply with 2019-0208, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of MBB-BK 117 D-2 helicopters must amend the emergency and malfunction procedures section of their Rotorcraft Flight Manual within 14 days of the directive's effective date by incorporating the specified Temporary Revision. All flight crews must be informed of the changes and operate accordingly. Compliance can also be achieved by incorporating later approved RFM revisions containing the same procedural updates.
Summary
EASA Airworthiness Directive 2017-0238 is an airworthiness directive issued for Airbus Helicopters Deutschland GmbH MBB-BK 117 D-2 helicopters of all serial numbers. It addresses an issue related to erroneous low rotor RPM indication during One Engine Inoperative (OEI) conditions. The directive mandates updates to the Rotorcraft Flight Manual emergency procedures to mitigate risks associated with this condition.
What changed
This directive requires amending the Rotorcraft Flight Manual (RFM) emergency and malfunction procedures section by inserting a specific Temporary Revision (TR No. 2, dated 20 November 2017) applicable to various MBB-BK 117 D-2 configurations. It introduces interim procedural changes pending a software modification to prevent erroneous rotor RPM indications. Later approved revisions of the RFM containing the same content are also acceptable for compliance.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could lead to inappropriate pilot responses during OEI operations, potentially causing helicopter damage or occupant injury. Operators and maintenance teams must ensure compliance to maintain continuing airworthiness and regulatory conformity. The amendment helps prevent operational hazards by updating emergency procedures promptly.
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