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"CORRECTION, I SAY AGAIN" before transmitting the
message a second time.
5.2.1.9.4.3 Recommendation.- When an operator
transmitting a message considers that reception is likely to be
Aircraji (acknowledging): dificult, he should transmit the important elements of the
CLEARED TO DESCEND TO NINE THOUSAND message (,,,ice.
FEET - TWA NINE SIX THREE
Station (denoting accuracy of readback):
MADRID
5.2.1.9.4.4 If the receiving operator is in doubt as to the
correctness of the message received, he shall request repetition
either in full or in part.
5.2.1.9.4.5 If repetition of an entire message is required.
5.2.1.9.2.3 When acknowledgement of receipt is trans- the words "SAY A G m shall be spoken. If repetition of a
mitted by an aeronautical station: portion of a message is required, the operator shall state:
"SAY AGAIN ALL BEFORE ...( first word satisfactorily
1) to an aircrafi station: it shall comprise the call sign of received)"; or "SAY AGm...(word before missing portion)
the aircraft, followed if considered necessary by the call TO...(word after missing portion)"; or "SAY AGAIN ALL
sign of the aeronautical station; AFlTR...(last word satisfactorily received)".
2) to another aeronautical station: it shall comprise the 5.2.1.9.4.6 Recommendation.- Specific iterns should be
call sign of the aeronautical station that is requested, as appropriate, such as "SAY AGAIN
acknowledging receipt. ALTIMETER", "SAY AGAIN WIND".
5.2.1.9.2.3.1 PANS.- An aeronautical station should 5.2.1.9.4.7 If, in checking the correctness of a readback.
acknowledge position reports and otherflight progress reports an operator notices incorrect items, he shall transmit the words
by reading back the report andterminating the readback by its "NEGATIVE I SAY A G m ' at the conclusion of the
241 1105
No. 80
Chapter 5 Annex 10 - Aeronautical Telecommunications
readback followed by the correct version of the items
concerned.
5.2.1.9.5 "Opemtions normal" reports
PANS.- When "operations normal" reports are transmitted
by aircrafr, they should consist of the prescribed call followed
by the words "OPERATIONS NORMAL".
5.2.2 Establishment and assurance
of communications
5.2.2.1 Communications watch/
Hours of service
5.2.2.1.1 During flight, aircraft stations shall maintain
watch as required by the appropriate Authority and shall not
cease watch, except for reasons of safety, without informing
the aeronautical station(s) concerned.
5.2.2.1.1.1 Aircraft on long over-water flights, or on
flights over designated areas over which the carriage of an
emergency locator transmitter (ELT) is required, shall
continuously guard the VHF emergency frequency 121.5 MHz,
except for those periods when aircraft are carrying out
communications on other VHF channels or when airborne
equipment limitations or cockpit duties do not permit
simultaneous guarding of two channels.
5.2.2.1.1.2 Aircraft shall continuously guard the VHF
emergency frequency 12 1.5 MHz in areas or over routes where
the possibility of interception of aircraft or other hazardous
situations exist, aqd a requirement has been established by the
appropriate authority.
5.2.2.1.1.3 Recommendation.- Aircrafr on flights other
than those specified in 5.2.2.1.1.1 and 5.2.2.1.1.2 should guard
the emergency frequency 121.5 MHz to the extent possible.
5.2.2.1.1.4 The user of the air-to-air VHF comrnunications
channel shall ensure that adequate watch is maintained
on designated ATS frequencies, the frequency of the aeronautical
emergency channel, and any other mandatory watch
frequencies.
5.2.2.1.2 Aeronautical stations shall maintain watch as
required by the appropriate Authority.
5.2.2.1.3 Aeronautical stations shall maintain a
continuous listening watch on VHF emergency channel 12 1.5
MHz during the hours of service of the units at which it is
installed.
Note.- See Annex 10, Volume V. 4.1.3.1.1 for provisions
related to the utilization of 121.5 MHz at aeronautical
stations.
5.2.2.1.4 When it is necessary for an aircraft station or
aeronautical station to suspend operation for any reason, it
shall, if possible, so inform other stations concerned, giving
the time at which it is expected that operation will be resumed.
When operation is resumed, other stations concerned shall be
so informed.
5.2.2.1.4.1 When it is necessary to suspend operation
beyond the time specified in the original notice, a revised time
of resumption of operation shall, if possible, be transmitted at
or near the time first specified.
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