AD 2007-23-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Diamond | Aircraft Industries Model DA 42 | Airworthiness Directives; Diamond Aircraft Industries Model DA 42 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Diamond Aircraft Industries Model DA 42 Airplanes |
Unsafe Condition
A significant drop in voltage causes a reset of the FADEC on both engines, leading to propeller blade feathering, which may result in catastrophic failure if the main aircraft battery is insufficiently charged.
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Required Actions
Install additional Engine Control Unit (ECU) Backup Batteries to supply electrical power to the ECU, preventing voltage drops during insufficient main battery power. Use Diamond Work Instruction WI-OSB-42-050, Revision 2, dated September 10, 2007, for installation. Ensure compliance with Diamond OSB No. OSB-42-050/1, dated October 15, 2007, and uninstall Diamond MÄM No. MÄM 42-240 or MSB No. MSB-42-042 if applicable.
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Compliance Time
Within 12 months of the effective date (December 26, 2007)
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Affected Aircraft
Diamond Aircraft Industries Model DA 42 airplanes equipped with TAE125-01 or TAE125-02-99 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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