On 10 August 2008, an Embraer-Empresa Brasileira De Aeronautica
ERJ170-100 aircraft, registered VH-ZHA, was being operated on a
scheduled passenger service from Sydney NSW, to Melbourne Vic.
While positioning for landing, the crew selected a 'flaps 1'
setting and a number of caution messages appeared on the engine
indicating and crew alerting system (EICAS) screen.
The aircraft operator found that the left number-3 slat actuator
torque trip limiter had actuated enabling the caution messages to
appear on the EICAS screen. The number-3 slat actuator was
replaced. A strip and condition report did not identify any failure
of the actuator and the failure was probably a result of operating
in icing conditions. As a result of similar occurrences, the slat
actuator manufacturer is re-designing the slat actuator seals.