Rotors Flight Control — Collective Bellcrank — Inspection
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of MBB-BK117 C-2 and D-2 helicopters must inspect the affected collective bellcrank parts within 100 flight hours or 6 months from 29 March 2021, whichever occurs first. If installation errors are found, corrective actions must be completed before the next flight. Additionally, any incorrect position markings must be corrected during the next maintenance involving part removal and reinstallation. Future installations must follow updated procedures as specified in the Airbus Helicopters Alert Service Bulletin.
Summary
EASA Airworthiness Directive 2021-0074 is an airworthiness directive addressing the inspection of the collective bellcrank on Airbus Helicopters Deutschland GmbH MBB-BK117 C-2 and D-2 helicopters. It applies to collective bellcrank parts with part numbers B670M7021101, B670M7021102, and D671M7008101. The directive mandates inspection and corrective actions to ensure proper installation and marking of the affected parts to maintain safe rotor flight control.
What changed
This new airworthiness directive introduces a one-time inspection requirement for the collective bellcrank on specified MBB-BK117 helicopter models due to reports of incorrect installation and marking. It also updates installation instructions to prevent future occurrences and requires corrective actions if discrepancies are found during inspection.
Why it matters
This directive is critical for aviation professionals because incorrect installation or marking of the collective bellcrank can lead to unintended collective inputs, potentially reducing helicopter control. Operators and maintenance organizations must comply to ensure continued airworthiness and flight safety, avoiding operational disruptions or safety incidents.
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