Airworthiness Directives; Bombardier Inc. Airplanes
airworthiness · Rule · Final rule. · Published 2012-09-17 · Effective 2012-10-22 · 77 FR 56989
Document
Document number
2012-22335
Federal Register citation
77 FR 56989
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Bombardier Inc.
Publication date
2012-09-17
Effective date
2012-10-22
FAA docket
Docket No. FAA-2012-0267
Abstract
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.