Aviation safety investigations & reports

Cabin pressurisation issue involving a Boeing B737-36E SF, ZK-FXK, near Darwin Airport, Northern Territory on 4 November 2021

Investigation number:
AO-2021-047
Status: Active
Investigation in progress

Summary

The ATSB has commenced a transport safety investigation into a cabin pressurisation issue involving a Boeing B737-36E SF, ZK-FXK, near Darwin Airport, Northern Territory on 4 November 2021.

After take-off, the flight crew identified that the aircraft was not pressurising as expected. As a precautionary measure, the flight crew levelled the aircraft at 11,000 ft and were cleared to descend to 10,000 ft. As the aircraft descended through 10,300 ft the cabin altitude warning presented and the flight crew donned oxygen masks. On return to Darwin, the flight crew identified that the cargo smoke depressurisation switch had been selected. The incorrect configuration was not identified prior to departure.

The evidence collection phase of the investigation will include interviewing the personnel involved, reviewing operator procedures and recorded data.

A final report will be released at the conclusion of the investigation. Should a critical safety issue be identified during the course of the investigation, the ATSB will immediately notify relevant parties, so that appropriate safety action can be taken.

General details
Date: 04 November 2021   Investigation status: Active  
Time: 08:30 UTC   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): Near Darwin Airport   Investigation phase: Evidence collection  
State: Northern Territory   Occurrence type: Air/pressurisation  
  Occurrence category: Incident  
Report status: Pending   Highest injury level: None  
Anticipated completion: 2nd Quarter 2022    

Aircraft details

Aircraft details
Aircraft manufacturer The Boeing Company  
Aircraft model B737-36E SF  
Aircraft registration ZK-FXK  
Serial number 25264  
Operator Airwork Flight Operations Limited  
Type of operation Air Transport High Capacity  
Sector Jet  
Damage to aircraft Nil  
Departure point Darwin Airport  
Destination Brisbane Airport  
Last update 19 November 2021