Controlled and uncontrolled airspace

"Controlled" does not mean "I need a clearance", and it does not mean "I am protected". It means: air traffic control is provided here — for the kinds of traffic it is provided for.

Applicability: Germany (airspace of the Federal Republic of Germany)
Rulemaking authority: Aeronautical Information Publication Germany – AIP VFR (DFS Deutsche Flugsicherung GmbH), effective 20 AUG 2026, ENR 1-3
Reviewed by NorthTrack on: 2026-09-13

How the German AIP divides it

C, D (other than CTR), D (CTR), E — G

Per AIP VFR ENR 1-3.

Class E therefore sits on the controlled side even though VFR flights need neither radio nor a clearance there. It is the most commonly misunderstood point in the whole airspace system.

Three services that must be kept apart

The services and who provides them

Which service is provided where is shown on the aeronautical chart and in the AIP behind exactly these abbreviations.

ATC — Air Traffic Control (in general)
Issues clearances; in Germany it separates VFR from IFR only in class C.
ATS — Air Traffic Services
The umbrella term for control, flight information and alerting services.
FIS — Flight Information Service
The service in class G airspace; no separation, no clearances.
AFIS — Aerodrome Flight Information Service
At aerodromes without an air traffic control unit.
TWR — Aerodrome control tower or aerodrome control
Responsible within the control zone.
APP — Approach Control Office or Approach Control
Responsible in the terminal area.
ACC — Area Control Centre or Area Control
Bremen, Langen and München, each for its own flight information region.
SERA — Standardised European Rules of the Air
The EU framework the national rules sit inside.

Air traffic control
What it provides: Issues clearances and separates traffic – in Class C, VFR from IFR. · Where in Germany: C, and for IFR also D
Traffic information
What it provides: Names known traffic. In D on request, with avoiding advice. In E "as far as practicable". · Where in Germany: C, D, E
Flight information service
What it provides: Provides information useful for the safe conduct of the flight – weather, airspace status, traffic advisories. No separation, no clearances. · Where in Germany: G

What this actually means
Outside Class C, nobody is making sure VFR traffic stays clear of other traffic. In D, E and G, see and avoid remains the crew's job. A transponder that is switched on and a traffic advisory that was heard do not replace looking outside.

Why Class E is the awkward one for general aviation

In E, IFR traffic is controlled while VFR traffic has no radio requirement.
Air traffic control therefore often does not know about the VFR traffic.
Traffic information is provided only "as far as practicable".
And this is exactly where the arrival and departure paths of many instrument aerodromes lie.

Hence the usual recommendation to listen out voluntarily on a flight information frequency in Class E and to set the transponder as the AIP specifies — even though neither is mandatory. Where listening out is mandatory, the airspace is an RMZ or TMZ.

Class G is not "rule-free"

Uncontrolled means no clearances and no separation. It does not mean that no rules apply. VMC minima, minimum heights, the 250 kt IAS speed limit below FL 100 and every rule on aerodrome traffic, restricted areas and operating restrictions all apply in G as well.

Airspace is national
ICAO defines classes A to G, but no State is obliged to use all of them, and the way they are applied differs considerably. The figures on this page refer to Germany. For a flight abroad, the Aeronautical Information Publication of the State concerned applies — even where the class letters are the same.

Official sources

DFS Deutsche Flugsicherung GmbH: Aeronautical Information Publication Germany – AIP VFR – Effective 20 AUG 2026. Open source (retrieved 2026-09-13)
DFS Deutsche Flugsicherung GmbH: Aeronautical Information Publication Germany – AIP VFR, GEN 2-1 to GEN 2-7 "Abkürzungen / Abbreviations" (bilingual German/English) – Effective 20 AUG 2026. Open source (retrieved 2026-09-13)