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On 29 June 2006, Bombardier DHC-8-402 (Dash 8-400) was being operated on a scheduled passenger service from Brisbane to Mackay, Qld. As the aircraft passed through FL220, the cabin altitude warning light illuminated, accompanied by the associated aural warning.

Initial checks by the crew indicated that the cabin differential pressure and cabin air flow appeared to be normal. The aircraft's bleed air switches also appeared to the crew to be correctly selected to the ON position.

An attempt by the crew to manually confirm the position of the bleed air switches revealed that both switches were in the OFF position. The subsequent selection of the switches to the ON position extinguished the cabin altitude warning light and the associated indications, and the aircraft's pressurisation system commenced normal operation.

In response to this incident, the operator developed an amendment to the Flight Crew Operating Manual for application in the company's turboprop operation, including affecting the Dash 8-400 checklist. The amendments to the aircraft checklist included:

  • revised responses to the pressurisation-related checklist items
  • an additional Pressurisation checklist requirement to be conducted at Transition
  • the addition of the requirement for the tactile confirmation of some checklist responses, including when one pilot has responsibility for both the 'challenge' and 'response' actions.
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General details
Date: 29 June 2006 Investigation status: Completed 
Time: 1900 UTC  
Location   (show map):56km N of Brisbane, Aerodrome Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Warning devices 
Release date: 02 April 2007 Occurrence class: Operational 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Bombardier Inc 
Aircraft model: DHC-8 
Aircraft registration: VH-QOD 
Serial number: 4123 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Brisbane, Qld
Departure time:1835
Destination:Mackay, Qld
Crew details
RoleClass of licenceHours on typeHours total
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Last update 18 April 2018