6.2 Communications
The frequency 121.500 MHz is monitored continuously during their hours of service at all area control centres.
Rescue aircraft use the call sign “RESCUE” and additional identification signals (ALFA, BRAVO, CHARLIE, etc.) during rescue operations.
Transmission and receiving of distress messages within Kazakhstan search and rescue area are carried out in accordance with Annex 10 ICAO, Volume 2, Chapter 5, paragraph 5.3.
In the case of emergency in flight, the crew shall transmit a distress call.
A distress call shall be transmitted on the last frequency used for ATS communication and on 121.500 MHz.
The distress signal can also be duplicated on other frequencies intended for flight support.
When the aircraft is over the sea, the distress call, in addition, may be transmitted on 500 kHz by tonal telegraph and on 2182 kHz by telephone.
Only the pilot-in-command or a person authorised by him is allowed to transmit the distress call.
Distress signal should be repeated at short intervals until confirmation is received.
The distress call is transmitted as follows:
- RADIOTELEPHONE
- “MAYDAY” - 3 times
- The call sign of the aircraft in distress - 3 times
- RADIOTELEGRAPH
- “SOS” - 3 times
- The word “DE” - 1 time
- The call sign of the aircraft in distress - 3 times
If the circumstances permit, the distress call shall be directly followed by the distress message:
- RADIOTELEPHONE
- “MAYDAY” - 3 times
- The call sign of the aircraft in distress - 2 times
- Latitude - 2 times
- Longitude - 2 times
- Time (UTC) - 2 times
- Type of damage and required help - 1 time
- Decision of pilot-in-command and other information which may help search and rescue - 1 time
- The word “OVER” - 1 time
- RADIOTELEGRAPH
- “SOS” - 3 times
- The call sign of the aircraft in distress -2 times
- Latitude - 2 times
- Longitude - 2 times
- Time (UTC) - 2 times
- Type of damage and required assistance - 1 time
- Decision of pilot-in-command and other information which will assist in search and rescue - 1 time
- The letter “K” - 1 time
It is necessary to switch to receiving during 1-2 minutes after each transmission of distress message. When the confirmation of reception of the distress message is received, the pilot-in-command acts in accordance with the situation and the instructions given.
If as a result of taken appropriate actions to prevent the distress situation, the crew is sure that there is no risk in further flight to the aerodrome, it is necessary to cancel the distress message immediately on the ATC frequency used at the time.
- The call sign of the aircraft in distress - 2 times
- The call sign of radio station in use at the time - 2 times
- The words “DISTRESS TRAFFIC ENDED” - 2 times
- The word “OVER” - 1 time
In the case of emergency landing out of aerodrome, the pilot-in-command or other crew members shall report to the nearest aerodrome or the local authorities, using any communication facilities: time and location of the emergency landing, condition of the crew, passengers and aircraft, as well as the assistance required.
If radio communication is impossible, all pyrotechnic means at the survivors’ disposal should be used to attract the attention of the rescue aircraft. In addition, all other means at the crew and passengers’ disposal should be used for indicating their position.
The following procedures are recommended for using emergency radio stations on 121.5 MHz:
- Immediately after landing (ditching) and during 10-12 minutes at the beginning of each hour of the first twenty-four hours one should transmit a thrice-repeated distress message, and after each transmission turn to receiving for 3 minutes;
- Upon visual observing or hearing the noise of an overflying aircraft one should transmit the distress message and try to establish two-way communication with it;
- If radio communication is not established, the transmission of the distress message should be alternated with the homing signals during 1.5-2 minutes;
- When two-way communication is established, the further order of operation with the radio station is effected according to instructions from the crew of the rescue aircraft.
The switching on of the emergency radio station for continuous emission is recommended on the request of rescue aircraft only and when survivors are unable to control the radio station.
In order to avoid harmful interference, simultaneous operation of two or more emergency radio stations is not permitted.
6.3 Search and rescue signals
For transmission of signals by survivors from the ground, it is necessary to use the international ground-air visual signal code prescribed in Annex 12 to the Convention on International Civil Aviation.
In order to avoid mistakes in the interpretation of visual signals, the survivors should display them as exactly as possible, securing maximum colour contrast with regard to the general background.
When the ground signals have been understood, the rescue aircraft indicates it by rocking the wings.
If no radio communication between the rescue aircraft and the survivors has been established, the rescue aircraft drops a message bag with a note containing the necessary information.