What happened
On 27 July 2012, a Garlick UH-1H helicopter, registration ZS-HCR, was participating in a wildfire suppression mission in the Amatole mountain range between Hogsband and Keiskammahoek. The aircraft was engaged in an industrial aid operation, working alongside another helicopter and a spotter aircraft to combat active fires.
After collecting approximately 1,000 litres of water from the Cata dam, the pilot began navigating toward the fire line. During this phase of the flight, the aircraft encountered significant weather challenges, including strong westerly winds of approximately 70 km/h and severe turbulence. While maneuvering near the terrain, the bambi bucket—suspended roughly 10 metres below the aircraft—struck rising ground. This impact caused the helicopter to pitch into a sudden nose-down attitude. The aircraft subsequently struck the terrain along its flight path, and a post-impact fire destroyed the wreckage. The pilot, the sole occupant of the aircraft, sustained fatal injuries.
The investigation
An investigation by the SACAA AIID examined the flight history, meteorological conditions, and the mechanical state of the aircraft. The inquiry established that the pilot was a highly experienced commercial pilot with over 314 hours on the UH-1H type. The aircraft was found to be well-maintained, with a valid Certificate of Airworthiness and a recent phase inspection completed earlier that year.
Investigators also reviewed the sequence of communications between the crew and other aircraft in the area. While a second helicopter had previously reported turbulence, the pilot of ZS-HCR had acknowledged the conditions. The investigation also looked into the aircraft's weight and balance, confirming that the helicopter was operating within its maximum weight limitations at the time of the accident.
Findings
- The primary cause of the accident was the collision of the external bambi bucket with rising terrain during positioning for the fire line.
- The impact of the bucket, which remained attached to the cargo hook, induced an unrecoverable nose-down attitude in the helicopter.
- Severe turbulence and strong mountain winds were present during the operation.
- A significant contributory factor was the pilot's decision not to jettison the external load in a timely manner, potentially due to concerns regarding the cost or repairability of the bucket.
Safety action
To enhance safety in similar operations, it is recommended that private helicopter operators involved in industrial aid—such as firefighting or external sling load missions—maintain an Operations Manual approved by the regulating authority. Such a manual should establish clear, standardized guidelines regarding operational limitations in adverse environments.