|Date: August 18, 1927
||Fatalities: Serz. Janis Vistucis
||Aircraft Involved: Martinsyde ADC.1 #21
- While performing aerobatics at Spilve, the aircraft went into a spin at an altitude of approximately 1000 metres.
- The spin was halted, but then the plane began spinning in the opposite direction, this time without recovery.
- It could not be determined if the spins were caused by a mechanical fault or an error in judgement by the pilot
performing the exercise.