On 6 June 2023, a Boeing 717-200 was on base leg about 10 nm from Hobart when chlorine fumes became evident on the flight deck. As the aircraft became fully established on final approach, the Captain recognised signs of cognitive impairment and handed control to the initially unaffected First Officer. Just before touchdown, he was similarly affected but was able to safely complete the landing and taxi in. The same aircraft had experienced a similar event two days earlier with no fault found. The Investigation determined that the operator’s procedures for responding to crew incapacitation in flight had been inadequate.