AD 2014-03-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
The use of the HBMU logic circuit to control the line voltage of the drain mast heaters, which are connected in parallel with the number 2 pitot static (PS) probe heater circuit, may result in a number 2 PS probe heater failure not being detected by the fault monitoring capabilities of the HBMU. This could lead to an unannunciated failure of two PS probe heaters, affecting controllability of the airplane in icing conditions.
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Required Actions
Modify the air data probes and sensors to correct the fault-monitoring capabilities of the HBMU and eliminate the potential dormant failure of the number 2 PS probe heater.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc. Model BD-700-1A10 airplanes, certificated in any category, equipped with any electrical wiring heater current/brake temperature monitor unit (HBMU) installed in accordance with any FAA supplemental type certificate specified in table 1 of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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