Aviation safety investigations & reports

Depressurisation involving a Fokker 100, VH-NHC, 167 km SSE Geraldton Airport, Western Australia, on 10 August 2020

Investigation number:
Status: Active
Investigation in progress
Phase: Final report: Internal review Read more information on this investigation phase


The ATSB is investigating a depressurisation involving a Fokker 100, registered VH-NHC, that occurred 167 km SSE of Geraldton Airport, Western Australia.

During cruise, the crew received a master caution EXCESSIVE CABIN ALTITUDE alert and the crew observed a reduction of cabin pressure. The crew and passengers donned oxygen masks and the crew conducted a descent to 10,000 ft.

The engineering inspection revealed an insulation blanket had become lodged in the pressurisation outflow valve, which prevented the aircraft from pressurising.

The evidence collection phase of the investigation will include interviewing the flight and cabin crews, review of maintenance documentation and recorded flight 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: 10 August 2020   Investigation status: Active  
Time: 7:40 WST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): 167 km SSE Geraldton   Investigation phase: Final report: Internal review  
State: Western Australia   Occurrence type: Air/pressurisation  
  Occurrence category: Incident  
Report status: Pending   Highest injury level: None  
Anticipated completion: 1st Quarter 2021    

Aircraft details

Aircraft details
Aircraft manufacturer Fokker B.V.  
Aircraft model F28 MK 0100  
Aircraft registration VH-NHC  
Serial number 11481  
Operator Network Aviation  
Type of operation Air Transport High Capacity  
Damage to aircraft Unknown  
Departure point Perth, Western Australia  
Destination Geraldton, Western Australia  
Last update 24 November 2020