Aviation safety investigations & reports

Air/pressurisation involving a Airbus A320-211, VH-HYC, 56km N Rockhampton, VOR, QLD on 22 February 1999

Investigation number:
Status: Completed
Investigation completed


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About 45 minutes after departure, the crew of the Airbus A320 noticed a burning smell in the cockpit and cabin. This was followed by the activation of the `AIR ENG2 BLEED FAULT', `NUMBER 2 PACK FAULT', `LAVATORY SMOKE' and `AVIONICS SMOKE' warnings. At the same time, the Number 1 airconditioning pack began to cycle uncontrollably to an overtemperature of 250 degrees Celsius. The crew commenced an immediate descent to flight level 210 and notified air traffic control. The crew observed that, after selecting the `BLOWER' and `EXTRACT' fans, the avionics smoke warning cleared. The `AIR BLEED 2' fault procedures were then carried out, but the crew was unable to stabilise the No. 1 airconditioning pack. After selecting the `CROSSBLEED' valve to `OFF', the No. 1 airconditioning pack stabilised and the outlet temperature reduced to acceptable values. The flight then proceeded using the No. 1 airconditioning pack. The investigation revealed severe cracking in the air bleed duct assembly aft of the pre-cooler at the Temperature Limitation Thermostat (TLT) sensor-mounting boss for the No. 2 engine. The TLT duct and sensor were replaced. The failure was the subject of a major defect report (MDR) submission to the Civil Aviation Safety Authority.
Download Final Report
[Download  PDF: 13KB]
General details
Date: 22 February 1999   Investigation status: Completed  
Time: 17:15 EST    
State: Queensland   Occurrence type: Air/pressurisation  
Release date: 20 July 1999   Occurrence category: Incident  
Report status: Final    

Aircraft details

Aircraft details
Aircraft manufacturer Airbus  
Aircraft model A320-211  
Aircraft registration VH-HYC  
Sector Jet  
Damage to aircraft Nil  
Departure point Townsville Qld  
Destination Brisbane Qld