AD 90-23-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BO105C and BO105S Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BO105C and BO105S Series Helicopters |
Unsafe Condition
Engine flameout resulting from ingestion of layers of wet snow in engine inlets.
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Required Actions
Install a continuous ignition system per MBB SB-BO 105-80-108, incorporate FAA-approved RFM Revision No. 2/16 with specified paragraphs, and ensure engine inlet deflector shield is installed.
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Compliance Time
Required as indicated, unless already accomplished.
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Affected Aircraft
All MBB Model BO105C and BO105S series helicopters certified in any category that operate in snow conditions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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