Aviation safety investigations & reports

Avionics system event involving Fokker F100, VH-FNR, West Angelas Aerodrome, Western Australia, on 1 September 2020

Investigation number:
AO-2020-046
Status: Completed
Investigation completed
Phase: Final report: Dissemination Read more information on this investigation phase

Final

Download Final report
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Alternate: [Download  DOCX: 942KB]
 

What happened

On 1 September 2020, a Virgin Australia Regional Airlines Fokker 100 aircraft, registered VH‑FNR, was being operated on a scheduled passenger flight from Perth Airport to West Angelas aerodrome, Western Australia. During the landing, the take-off/go-around (TOGA) mode activated, disarming automatic deployment of the lift dumpers. Manual activation of the lift dumpers and reverse thrust did not occur on the first or second attempts by the flight crew. On the third attempt, the lift dumpers and thrust reversers deployed. During the landing roll, an engine speed caution activated as reverse thrust had been selected between the idle and maximum reverse positions.

What the ATSB found

The ATSB found that, during the landing phase, the TOGA mode activated uncommanded for an undetermined reason. This subsequently prevented automatic deployment of the lift dumpers.

It was also established that the aircraft likely landed so softly that the weight on wheels sensors did not immediately activate. This delayed manual activation of the lift dumpers and deployment of reverse thrust.

What has been done as a result

While no faults were found with the TOGA system, the operator has requested that the aircraft manufacturer develop guidance documentation for maintenance of TOGA switch travel and resistance.

Safety message

This incident illustrates that, despite the high reliability of modern flight control systems, flight crews can still be faced with non-normal situations that require their combined judgement and expertise to safely manage.

Download Final report
[Download  PDF: 874KB]
 
 
Alternate: [Download  DOCX: 942KB]
 

The investigation

General details
Date: 01 September 2020   Investigation status: Completed  
Time: 16:47 WST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): West Angelas Aerodrome   Investigation phase: Final report: Dissemination  
State: Western Australia   Occurrence type: Incorrect configuration  
Release date: 22 July 2021   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Fokker B.V.  
Aircraft model F28 MK 0100  
Aircraft registration VH-FNR  
Serial number 11488  
Operator Virgin Australia Regional Airlines  
Type of operation Air Transport High Capacity  
Sector Jet  
Damage to aircraft Nil  
Departure point Perth, Western Australia  
Destination West Angelas, Western Australia  
Last update 22 July 2021