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On 15 June 2006 at approximately 1630 Eastern Standard Time, during a scheduled flight from Hervey Bay, Qld, to Brisbane, Qld, the crew of the Fairchild Industries SA227-AC (Metro III) aircraft, registered VH-SEF, noticed that the cabin temperature was colder than desired. After adjustment to the auto and manual cabin temperature controls, the cabin temperature increased to a higher than expected range and could not be reduced. Shortly after, smoke was seen coming from the right side cockpit air vents. The crew isolated the right bleed air system and diverted the aircraft to Maroochydore, Qld.

After examination of the aircraft's air-conditioning system, the right hot air mixing valve was replaced and the aircraft returned to service without further problem.

During the incident, the crew found that fitment of their emergency oxygen masks was ineffective, requiring them to hold the masks in place with one hand, and that the passenger address system was also ineffective in alerting the passengers to the emergency.

Only one minor injury in the form of sore ears was reported as a result of the incident.

As a result of this incident the Australian Civil Aviation Safety Authority issued an Airworthiness Bulletin to address maintenance aspects of flight crew oxygen masks.

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General details
Date: 15 June 2006 Investigation status: Completed 
Time: 1630 EST  
Location   (show map):Maroochydore Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Smoke 
Release date: 12 December 2007 Occurrence class: Operational 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: Serious 
Aircraft details
Aircraft manufacturer: Fairchild Industries Inc 
Aircraft model: SA227 
Aircraft registration: VH-SEF 
Serial number: AC-641 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Hervey Bay, Qld
Departure time:1620
Destination:Brisbane Qld
Minor: 0101
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Last update 18 April 2018