Ukraine's transport ministry is cracking down on breaches of alcohol limits by air crew following an incident involving a Donbassaero flight last month.
Pre-flight checks on the aircraft's crew at Simferopol Airport on 9 March determined that a flight engineer and flight attendant each had elevated levels of alcohol.
The ministry identifies the affected flight as a Donbassaero Yakovlev Yak-42 service to Kiev.
It says that the state aviation authority determined that "personal discipline" of the crew members and "lack of proper control" by the commander had led to the incident.
While disciplinary measures were carried out within the airline, the ministry says that all Ukrainian carriers are to be sent a list of requirements and recommendations to prevent future repetition.
It says that oversight of crew health will be "significantly tightened", adding that this will include continuous monitoring.