AD 2024-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
The fan in a transformer rectifier unit (TRU) can become inoperative in a manner that is not detectable by the fan monitoring circuit, leading to higher TRU operating temperatures, which can trigger the activation of the load shed function to reduce the electrical load and temperature in the TRU.
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Required Actions
Replace the existing TRU Number 2 with a new part number that incorporates a correction to the fan and the monitoring circuit, and prohibit the installation of affected parts.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc., Model BD-700-2A12 airplanes, with TRU Number 2 part number G02404521-001.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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