Airworthiness directives › 2016-24-06
AD 2016-24-06 Airworthiness Directives; Bombardier, Inc. Airplanes
Models named: DHC-8-102, -103, -106, -201, -202, -301, -311, -315. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bombardier, Inc. Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 airplanes, certificated in any category, serial numbers 003 through 672 inclusive.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as provided by paragraph (h) of this AD, within 5,000 flight hours or 60 months after the effective date of this AD, whichever occurs first: Replace the existing circuit breakers in both the left and right side of the pitot heater system with circuit breakers that have higher trip points, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-30-39, dated November 11, 2015 (for the right side), and Bombardier Service Bulletin 8-30-40, dated November 11, 2015 (for the left side).
Unsafe condition
This AD was prompted by several occurrences of loss of airspeed data on both pilot and co-pilot air speed indicators due to the accumulation of ice on the pitot probes. An investigation revealed that the accumulation of ice was due to inoperative pitot probe heaters. We are issuing this AD to prevent circuit breakers from tripping and cutting power supply to the pitot probe heater, which could cause loss of airspeed data and result in the flight crew not being able to control the airspeed of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1