Chapter 17
Communications
17.1 Communication failure (ICAO)
If all attempts to establish contact fail, transmit message twice on
designated channel, proceeded by the phrase “Transmitting
Blind.”
Set Mode A Transponder Code to 7600.
If in vmc, continue in vmc to the nearest suitable airfield and
land, reporting arrival to appropriate ats by the most expeditious
means.
If in imc or unlikely to be able to maintain vmc:
17.2 Communication failure (UK airspace)
The UK procedures expand on the icao procedures:
- If following a sid fly the published lateral and vertical
profiles, including any step climb, until the last waypoint of
the procedure is reached. Maintain current speed and last
assigned level (or minimum flight altitude if this is higher)
until 7 minutes have elapsed since setting 7600. Then
adjust speed and level in accordance with current flight plan.
This procedure also applies to rnp-1 (prnav) departures.
- If following a star, follow the lateral profile but maintain
current speed and last assigned level (or minimum flight
altitude if this is higher) until 7 minutes have elapsed since
setting 7600. Subsequently, arrange descent to be as close
as possible to published planning profile. If no profile is
published, arrange to be at the iaf at minimum published
level. This procedure also applies to rnp-1 (prnav) arrivals.
- If under radar vectors from Approach Control Radar, comply
with instructions on radar vectoring chart. If under radar
vectors without specified limit from other ats unit, continue
in accordance with last instructions until 3 minutes have
elapsed since setting 7600, then proceed in most direct
manner to rejoin current flight plan route. If necessary, climb
to minimum flight altitude.
- If performing an sra, continue visually or by using an
alternate approach aid. If this is not possible, carry out a
missed approach and continue to the holding position of a
suitable aerodrome with a notified instrument approach and
carry out that procedure.
[ icao annex 10, icao doc 4444, ukaip enr 1.1.3.4 ]