[Kharon]

Further update: ATSB presser & prelim report.

Finally via the ATSB website:

Update: Essendon accident
Update of ATSB’s investigation into the collision with retail facility involving B200 King Air VH-ZCR at Essendon Airport, Victoria on 21 February 2017.

The ATSB has today released an update into the tragic accident involving a B200 King Air aircraft that collided with a retail facility at Essendon Airport on 21 February this year. Sadly all four passengers and the pilot died in the accident.

ATSB Chief Commissioner Greg Hood said ATSB investigators have done an extensive amount of work to date.

“Investigators have gathered and assessed a large volume of evidence such as CCTV footage and witness statements. The team has also inspected the engines in close consultation with the manufacturer,” Mr Hood said.

“The aircraft’s fire-damaged CVR was retrieved and transported to the ATSB’s technical facilities in Canberra for examination and download.

“While the CVR was successfully downloaded, no audio from the accident flight was recorded. All the recovered audio was from a previous flight on 3 January 2017. The ATSB is examining the reasons for this.”

Mr Hood said that while the team is diligently assessing the physical and digital evidence, the considerable damage to the aircraft is presenting challenges.

“The extensive damage caused by the collision and post-impact fire has meant investigators are yet to determine a clear picture of the causal factors behind the accident and loss of life,” Mr Hood said.

“I offer my deepest sympathies to the families and loved ones of those on board the aircraft. Every effort is being made to determine the cause of this tragic accident.”

This update does not contain findings. The ATSB will present the findings of its investigation in the final report, due out in around 12 months. Further updates will be provided if significant information comes to hand.

If the ATSB identifies any safety issues during the course of the investigation, it will immediately bring them to the attention of relevant operators and authorities for safety action.

Read the Preliminary report AO-2017-024.
 



Last update 29 March 2017 

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Preliminary report: 29 March 2017

The occurrence

On 21 February 2017, the pilot of a Beechcraft King Air B200, registered VH-ZCR, was conducting a flight from Essendon Airport, Victoria to King Island, Tasmania. On board were the pilot and four passengers. The weather was fine with a recorded wind speed of 5 kt (9 km/h) from the north‑north‑west and a temperature of 12 °C.

Witnesses familiar with the aircraft type reported that the take-off roll along runway 17[1] was longer than normal. After becoming airborne, the aircraft was observed to yaw[2] left.

The aircraft performed a shallow climbing left turn while maintaining a relatively level pitch[3] and roll[4] attitude. Airservices Australia Automatic Dependent Surveillance Broadcast (ADS-B) data[5] indicated the aircraft reached a maximum height of approximately 160 ft above ground level while tracking in an arc to the left of the runway centreline (Figure 1). The aircraft subsequently collided with a building in the Essendon Airport retail precinct.

The pilot and passengers were fatally injured and the aircraft destroyed. Additionally, a number of people on the ground received minor injuries.

Figure 1: Aircraft track from Airservices Australia ADS-B data. All heights above ground level

Source: Google earth, modified by the ATSB

Wreckage and impact information

The aircraft collided with the roof of the building and associated concrete parapet before coming to rest in the building’s rear car park (Figures 2 and 3). Examination of the significantly fire- and impact‑damaged wreckage determined that, at impact the:

• aircraft was configured with 10° of flap
  
• landing gear was in the extended and locked position.
  

Examination of the building roof showed evidence of propeller slash marks and nose and main gear tyre marks (Figure 3). Those marks were consistent with the aircraft having significant left yaw and a slight left roll at initial impact.

Figure 2: Accident site overview

Source: Metropolitan Fire Brigade (Melbourne), modified by the ATSB

On-site examination of the wreckage did not identify any pre-existing faults with the aircraft that could have contributed to the accident.

The left and right engines separated from their mounts during the impact sequence. Both engines had varying degrees of fire and impact damage. The engines were removed from the accident site to a secure facility where they were disassembled and inspected by the ATSB with assistance from the engine manufacturer. That examination found that the cores of both engines were rotating and that there was no evidence of pre-impact failure of either engine’s internal components. However, a number of engine components were retained for further examination and testing.

The propellers separated from the engines during the impact sequence. Both propellers exhibited evidence of rotation and have been retained by the ATSB for detailed examination. The ATSB also retained several airframe components, documents and electronic devices for further examination.

Figure 3: Accident site building roof overview
Source: Metropolitan Fire Brigade (Melbourne), modified by the ATSB

Recorded information

Cockpit voice recorder

A Fairchild model A100S cockpit voice recorder (CVR), part number S100-0080-00 and serial number 01211, was fitted to the aircraft. This model of recorder uses solid-state memory to record cockpit audio and has a recording duration of 30 minutes. CVRs are designed on an ‘endless loop’ principle, where the oldest audio is continuously overwritten by the most recent audio. Apart from pilot speech and radio transmissions, CVRs can record control movements (for example flap and gear levers), switch activations, aural warnings and background sounds such as propeller and engine noise.

The aircraft’s fire‑damaged CVR was recovered from the accident site and transported to the ATSB’s technical facility in Canberra, Australian Capital Territory on 23 February 2017 for examination and download (Figure 4).

Figure 4: Comparison of an undamaged Fairchild model A100S CVR (top) with the CVR from VH-ZCR (bottom)

Source: ATSB

The CVR from VH-ZCR was disassembled and the memory board was removed from inside the crash-protected memory module. The memory board was undamaged (Figure 5).

Figure 5: Memory board (removed from inside the crash-protected module)

Source: ATSB

The CVR was successfully downloaded however, no audio from the accident flight was recorded. All the recovered audio was from a previous flight on 3 January 2017. The ATSB is examining the reasons for the failure of the CVR to operate on the accident flight.

Air traffic control audio

Examination of the recorded air traffic control radio calls for Essendon Tower on 21 February 2017 revealed that, shortly after take-off, the pilot broadcast a MAYDAY call.[6] The pilot repeated the word ‘MAYDAY’ seven times within that transmission. No additional information regarding the nature of the emergency was broadcast.

Further investigation

The investigation is continuing and will include:

• examination of both propellers to determine the blade angles at impact, their pre-impact condition and to assess the impact damage
  
• further examination of a number of retained engine and airframe components
  
• further interviews with a number of witnesses and involved parties
  
• further analysis of numerous witness reports
  
• review of the aircraft’s maintenance and operational records
  
• review of the meteorological conditions at the time
  
• review of the approval process for the building that was struck by the aircraft
  
• analysis of aircraft performance and other operational factors
  
• review of the pilot’s medical and flying history
  
• review of the operating processes and approvals
  
• determining the reasons for the failure of the CVR to record during the accident flight
  
• further analysis of recorded information, including:
  - Automatic Dependent Surveillance Broadcast data
  - dash camera and other video footage provided by witnesses
  - closed-circuit television video footage
  - air traffic control audio recordings.
  

Identification of safety issues

Should any significant safety issues be identified during the course of the investigation, the ATSB will immediately bring those issues to the attention of the relevant authorities or organisations. This will allow those parties to develop safety action to address the safety issues. Details of such safety issues, and any safety action in response, will be published on the ATSB website at www.atsb.gov.au.

MTF...P2