Aviation safety investigations & reports

Flight control system event involving an F100, VH-FZO, near Argyle aerodrome, WA on 7 March 2014

Investigation number:
AO-2014-045
Status: Completed
Investigation completed

Summary

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On 7 March 2014, a Fokker 100 aircraft, registered VH-FZO, departed Perth on a scheduled passenger flight to Argyle, Western Australia. On board was a captain designated as the pilot flying (PF), and a training captain, seated in the right seat, designated as the pilot monitoring (PM).

During the cruise, the aircraft pitched down and both thrust levers came back towards idle to maintain the selected speed during the descent. The rate of descent reached about 1,700 feet per minute and the aircraft descended about 300 ft. The PF then disconnected autopilot 1 and connected autopilot 2.

The aircraft continued to Argyle and the crew commenced descent to the aerodrome. When at about 1,000 ft above ground level (AGL) and about 3 NM from the runway threshold, the PF stated that the thrust levers were stuck. The PM then tried to move the thrust levers and confirmed they were stuck. The PM applied force with both hands on the thrust levers and they jerked forwards, resulting in about a quarter of the normal available thrust. The PM directed the PF to get the aircraft back onto the normal profile and the PF extended full flap. Just prior to touchdown, the PM extended the speed brake and when at about 10 ft AGL, he applied sufficient force to move the thrust levers to the idle position. Engineers found that an elevator servo and a thrust lever servo had failed.

This incident provides an excellent example of how an experienced crew faced with a novel and unanticipated threat, were able to modify their roles and work together to safely complete the flight.

 

Aviation Short Investigations Bulletin - Issue 33

Download Final Report
[Download  PDF: 332KB]
 
 
Alternate: [Download  DOCX: 603KB]
 
General details
Date: 07 March 2014   Investigation status: Completed  
Time: 1210 WST    
Location   (show map): near Argyle aerodrome   Investigation type: Occurrence Investigation  
State: Western Australia   Occurrence type: Flight control systems  
Release date: 06 August 2014   Occurrence class: Technical  
Report status: Final   Occurrence category: Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Fokker B.V.  
Aircraft model F28  
Aircraft registration VH-FZO  
Serial number 11305  
Operator Virgin Australia Regional Airlines  
Type of operation Air Transport High Capacity  
Sector Jet  
Damage to aircraft Nil  
Departure point Perth, WA  
Destination Argyle, WA  
Last update 14 November 2018