The Bureau of Air Safety Investigation recommends that the Joint
Airworthiness Authorities note the circumstances surrounding this
occurrence, and note the fact that the Bureau shares a number of
concerns regarding aircraft certification procedures, particularly
those involving flight in known icing conditions.
As a result of the investigation into this occurrence, the Bureau
simultaneously issues the following interim recommendations:
IR990072
The Bureau of Air Safety Investigation recommends that Saab
Aircraft AB fit the ice-speed modification of the stall warning
system to the worldwide fleet of Saab 340 aircraft, as a matter of
priority.
IR990073
The Bureau of Air Safety Investigation recommends that the Federal
Aviation Administration note the circumstances surrounding this
occurrence, and note the fact that the Bureau shares a number of
concerns regarding aircraft certification procedures, particularly
those involving flight in known icing conditions.
IR990075
The Bureau of Air Safety Investigation recommends that
Luftfartsverket note the circumstances surrounding this occurrence,
and note the fact that the Bureau shares a number of concerns
regarding aircraft certification procedures, particularly those
involving flight in known icing conditions. The Bureau also
recommends that Luftfartsverket as the initial certifying agency of
the Saab 340 aircraft, review the certification aspects of the
aircraft's stall warning system, particularly in icing
conditions.
IR990076
The Bureau of Air Safety Investigation recommends that the Civil
Aviation Safety Authority examine the circumstances surrounding
this occurrence and take whatever steps it considers necessary to
ensure the safety of the Saab 340 fleet operating within
Australia.