A drone landed on Lake Zurich
Drones landed after an accident near a children's play area were given permission to take off again.
The incident in May was the second in a year and led to an independent security investigation.
The Swiss Post and drone maker Matternet were working together to transport laboratory samples between hospitals.
The first incident, in January last year, saw a drone make an emergency landing on Lake Zurich after a GPS hardware error.
In the second, more serious incident, the drone's parachute failed to come loose and fell a few meters from an area where the children were playing. There were no injuries.
At the time, the Swiss Post asked Matternet to make several changes:
- reinforce parachute ropes with metal braid
- has two strings instead of one
- whistle alerting people to your presence louder
All of this has been implemented, the company told BBC News.
"We certify that Swiss Post and Matternet maintain high safety standards and a high level of security awareness. There are no reasons why flight operations should not be resumed," said Professor Michel Guillaume, head of the Aviation Center at the University of Zurich in Zurich. Applied Sciences (ZHAW) and a member of the expert council.
In response, Matternet said: "We are excited to resume and expand our operations in Switzerland in close partnership with the Swiss Post and the Swiss Federal Civil Aviation Office. Switzerland is known for its high safety standards and high quality transport services. ".