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Communication

In practice, suspicion of a failing radio connection will arise if an aircraft does

not receive a response to its messages – or if a busy frequency suddenly

becomes silent.

4.11.1 Legal text regarding radio failure

If it is not possible for an aircraft to establish contact with the relevant

aeronautical radio station on the frequency normally used by the station, the

aircraft must:

a. attempt to establish contact on the previously used frequency and, if this

does not work, on another appropriate frequency or if this is

unsuccessful

b. attempt to establish contact with the aeronautical radio station in

question, other aeronautical radio stations or other aircraft by any

available means, stating that contact on the originally assigned

frequency could not be established or if this is also unsuccessful

c. on the normally used frequency, begin the transmission with the phrase
TRANSMITTING BLIND and then transmit the message twice.

If the aircraft is equipped with an SSR transponder, mode A, code 7600, must

be selected.

In other words:

- Return to the last used frequency

or

- When using all methods, try calling the station in another way (telephone,
internet)

or

- Try to contact other aircraft

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Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© marts 2026 418