Division SERA.14087 Use of relay communication techniqueF1

When an ATS unit has been unable to establish contact with an aircraft after calls on the frequencies on which the aircraft is believed to be listening, it shall:

1. (1)

   request other ATS units to render assistance by calling the aircraft and relaying traffic, if necessary; and

2. (2)

   request aircraft on the route to attempt to establish communication with the aircraft and relay traffic, if necessary.

The provisions of point (a) shall also be applied:

1. (1)

   at request of the ATS unit concerned;

2. (2)

   when an expected communication from an aircraft has not been received within a time period such that the occurrence of a communication failure is suspected.