Hong Kong Regulations

AIR NAVIGATION (HONG KONG) ORDER 1995 - SECT 58

Records to be kept

The operator of a public transport aircraft registered in Hong Kong shall, in
respect of any flight by that aircraft during which it may fly at an altitude
of more than 49000 feet, keep a record in a manner prescribed of the total
dose of cosmic radiation to which the aircraft is exposed during the flight
together with the names of the members of the crew of the aircraft during the
flight.