Summary
We are adopting a new airworthiness directive (AD) for certain Bombardier Inc. Model DHC-8-400 series airplanes. This AD was prompted by reports that the automatic de-icing mode became unavailable due to a failure of the timer and monitor unit (TMU). This AD requires replacing the TMU. We are issuing this AD to prevent loss of the automatic de- icing mode and consequent increased workload for the flightcrew, which, depending on additional failures, could lead to loss of control of the airplane.
Directive Details
AD Number
FAA-2012-0267
Document Number
2012-22335
Type
Rule
Publication Date
September 17, 2012
Effective Date
October 22, 2012
Affected Manufacturer
Bombardier Inc.
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2012-0267
Topics
Official Documents
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