What happened
On 17 January 2006, a student pilot conducting a solo navigation flight departed Cape Town International Aerodrome in a Robinson R22 Beta II, registration ZS-RXA. The flight was intended to follow a specific coastal route, flying along the Atlantic seaboard toward Hout Bay and Muizenberg. During the flight, the pilot was flying in a loose formation behind another student pilot in aircraft ZS-RUX.
As the two helicopters passed near Cape Point, eyewitnesses from a nearby hiking group observed the ZS-RXA suddenly pitch forward into a steep nosedive. The aircraft struck the sea approximately 800m offshore near Rooikrans. There were no reports of smoke, explosions, or mechanical failure prior to the impact. The pilot was killed in the crash, and the aircraft was destroyed upon impact and subsequent submersion.
The investigation
SACAA AIID investigators examined the aircraft, the pilot's medical history, and the flight circumstances. The investigation confirmed that the helicopter was airworthy, properly fueled, and operating within its weight and balance limits. Meteorological conditions were favorable, with light winds and clear visibility.
Medical examinations of the pilot revealed a history of high cholesterol and a previous fainting episode that had raised concerns of a potential heart attack. A post-mortem examination of the pilot's heart showed histological evidence of ischemic contraction bands, which are indicative of myocardial ischemia. This suggested that the pilot likely experienced an acute medical event while in flight.
Findings
- The pilot was flying a valid solo navigation exercise under the instructions of a flight instructor.
- The flight path deviated from the pre-briefed route, as the pilot flew along the coastline rather than inland.
- The pilot most likely suffered a sudden cardiovascular event that led to in-flight incapacitation.
- The sudden nosedive was likely caused by the pilot physically leaning forward during a period of intense chest pain, inadvertently pushing the cyclic control into full deflection.