Prior Permission Required
The term Prior Permission Required ( PPR ; literally: prior authorization required) means in aviation that obtaining a permit is required.
So z. B. Before using an aircraft on a special landing site (or at a commercial landing site outside of operating hours), at which an air traffic control or an air traffic control officer is not permanently present, a permit to approach the airfield must be obtained. This is usually done by phone, but can also be done by radio. The same applies to the night time at airfields, which normally do not handle air traffic at night.
- Germany AIP, part VFR and in the news for pilots, part. 1, published 15/93.