Safety Issue
Both the operator's and the manufacturer's Quick Reference
Handbook (QRH) for the DHC8-300 did not contain adequate guidance
for the flight crew to resolve the abnormal operation of the
aircraft systems.
Safety Recommendation
The Australian Transport Safety Bureau recommends that
Bombardier Aerospace address this safety issue.
In general, the report makes continual reference to the lack of
adequate QRH procedures associated with a complete loss of airspeed
information. The basis of certification for the Q300 and other Part
25 aircraft dictates that a loss of all airspeed information must
not occur. Therefore, neither QRH nor AFM procedures are provided.
Airspeed information failures of this type are extremely improbable
events. In addition, it is not possible to provide accurate
guidance to flight crews covering the loss of all airspeed
information given the numerous configurations and operating
scenarios to which an aircraft may be exposed. Accurate information
is provided for the loss of a single airspeed indicator, which was
demonstrated by the flight crews handling of the event involving
aircraft VH-SBW.
