Preliminary report published: 19 October 2018
On 17 August 2018, a MBB/Kawasaki BK 117 (BK 117), registered VH-JWB (JWB), was performing aerial work in the Ulladulla area, New South Wales (NSW). The operator had been tasked by the NSW Rural Fire Service (RFS) to support fire-fighting activites in the Bomberderry area on 15 August 2018, then in the Ulladulla area from 16 August 2018.
On the morning of 17 August 2018, JWB departed Nowra Airport for the Milton Showgrounds, the base for helicopters operating in support of NSW RFS in the Ulladulla area. The pilot was the sole occupant and conducted a number of flights that day, refuelling at 1030 Eastern Standard Time and again at 1225.
In the afternoon, the pilot of JWB, in company with another BK 117, was tasked to assist ground‑based fire crews to extinguish fires near Plot Road, Milton. Both helicopters were operating with a Bambi Bucket (bucket) on a longline. Pilots who were airborne in the same area at the time reported that the wind was 10 to 20 kt from the south east and the visibility was approximately 3 km in the area due to smoke.
After flying a number of circuits between a dam and the fire, the in-company pilot observed JWB depart the dam with a bucket-load of water in a south-easterly direction towards the fire (Figure 1).
Source: Google Earth
On filling his bucket, the in-company pilot looked for JWB but could not sight the helicopter.
A witness on Plot Road observed the helicopter tracking in a north-easterly direction. A number of witnesses then observed the bucket and longline become tangled in trees at the edge of a clearing, followed by the helicopter colliding with terrain (Figure 2). The pilot was fatally injured and the helicopter was destroyed.
On arrival at the accident site, ATSB investigators found the main body of the helicopter inverted in a clearing with the bucket and longline still attached. The bucket was found caught in trees at the edge of the clearing. The tail rotor section was detached and located approximately 21 m from the main wreckage. One main rotor blade had separated from the rotor head and was located approximately 9 m from the helicopter. The other blades remained connected to the main rotor head. Aviation fuel was observed to be leaking from the helicopter; there was no post‑impact fire.
The ATSB recovered a number of components from the accident site for further examination. The helicopter was not equipped with a flight data recorder or cockpit voice recorder, nor was it required to be.
The investigation is continuing and will include consideration of the:
- pilot’s qualifications, experience and medical history
- maintenance documentation
- recovered helicopter components
- operational documentation
- witness interviews
- electronic devices recovered from the aircraft.
The information contained in this update is released in accordance with section 25 of the Transport Safety Investigation Act 2003 and is derived from the initial investigation of the occurrence. Readers are cautioned that new evidence will become available as the investigation progresses that will enhance the ATSB's understanding of the accident as outlined in this update. As such, no analysis or findings are included.
- The MBB/Kawasaki BK 117 is a twin-engined medium utility–transport helicopter jointly developed and manufactured by Messerschmitt-Bölkow-Blohm of Germany and Kawasaki of Japan.
- Eastern Standard Time (AEST): Coordinated Universal Time (UTC) + 10 hours.
- A Bambi Bucket, also known as a helicopter bucket, is a specialised bucket suspended on a cable carried by a helicopter to deliver water for aerial firefighting.
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|Date:||17 August 2018||Investigation status:||Active|
|Time:||1400 EST||Investigation level:||Defined - click for an explanation of investigation levels|
|Location:||near Ulladulla, Jervis Bay SW 38 km||Investigation phase:||Evidence collection|
|State:||New South Wales||Occurrence type:||Collision with terrain|
|Release date:||19 October 2018||Occurrence class:||Operational|
|Report status:||Preliminary||Occurrence category:||Accident|
|Expected completion:||3rd Quarter 2019||Highest injury level:||Fatal|
|Aircraft manufacturer||Kawasaki Heavy Industries|
|Aircraft model||BK117 B-2|
|Type of operation||Aerial Work|
|Damage to aircraft||Destroyed|
|Departure point||Milton Showgrounds, Ulladulla|