Airworthiness Directives; AlliedSignal Inc. TPE331 Series Turboprop Engines

Résumé

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to AlliedSignal Inc. TPE331 series turboprop engines equipped with Woodward fuel controls. This proposal would require revising the applicable Emergency Procedures or Abnormal Procedures Section of the applicable FAA-approved Airplane Flight Manual (AFM) or Pilot's Operating Handbook (POH) to include a paragraph relating to a non-responsive power lever. In addition, this proposal would require replacing or reworking orifice fittings and restrictors, which would constitute terminating action to the requirement to revise the applicable AFM. This proposal is prompted by reports of occasional icing of the inlet Pt2 sensor, which can produce an erroneous (high) pressure signal to the fuel control, causing little or no response to power lever movement. The actions specified by the proposed AD are intended to prevent a non-responsive power lever and lack of control of engine power.