AircraftDirectives
Airworthiness Directive

AD 2012-18-15 77 FR 56989

Federal Aviation Administration · 14 CFR part 39

FR document
2012-22335
Amendment
39-17192
Published
2012-09-17
Models covered
1
Last live check
2026-08-17

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AD

2012-18-15

FR doc 2012-22335 · 77 FR 56989

AD 2012-18-15Published 2012-09-17Effective 2012-10-22

Requires replacing the TMU.

Full official 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.

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Applies to 1 model in our index