in this article we look at wo occasions a helicopter has triggered a bush fire. In the first the helicopter succumbed to the flames. In the other case the helicopter fled the scene and the environment suffered.
Robinson R44 Northern Territory, 22 June 2022
This R44 was conducting a geophysical survey north of Alice Springs. The survey involved landing every 1 km to collect data. On board were the pilot and a survey field technician. According to the Australian Transport Safety Bureau (ATSB) occurrence brief:
At about 1000 local time, the pilot landed in an area of spinifex grass and the field technician disembarked the helicopter to carry out their survey tasks. The technician reported that, after setting up the equipment, they looked up and noticed flames under the helicopter.
It was reported that the helicopter’s engine bay was positioned close to an area of dry spinifex and the heat from the engine’s exhaust ignited the grass. The ensuing fire spread very quickly, engulfing the helicopter.
The pilot vacated the aircraft and sustained minor burns to their leg while attempting to retrieve a satellite phone on board.
The helicopter was destroyed.
The ATSB noted they were aware 5 occurrences in the preceding 10 years where a Robinson helicopter has been destroyed by grass fire. The R22 and R44 Pilot Operating Handbooks contain a warning:
Do not land in tall dry grass. The exhaust is low to the ground and very hot; a grass fire may be ignited.
Australian Army NH Industries NH90 (MRH-90 Taipan), Namadgi National Park, Australian Capital Territory, 27 January 2020
However a landing light caused a grass fire.
The aircraft suffered significant damage but took off and flew back to Canberra.
It landed safely and in “little over an hour…Defence public affairs was directed to start developing a holding statement and talking points.”
The grass fire had however developed into what was capital city Canberra’s “most serious” bushfire threat since 2003 that consumed more than 7,900 hectares.
Critical to the fire’s rapid development was the failure of the helicopter crew to raise the alarm for c45 minutes (i.e. until they landed). A lack of precise information sowed confusion as fire crews were dispatched to different parts of the national park in attempt to locate and extinguish the blaze.
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