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C) 121.6 - 121.9917
inclusive
International and National
Aerodrome Surface
Communications
Reserved for ground movement, pre-flight checking, air traffic services clearances,
and associated operations.
d) 122 - 123.05
inclusive
National Aeronautical Mobile
Services
Resewed for national allotments.
Auxiliary frequency SAR See 4.1.4.1.
f) 123.15 - 123.6917
inclusive
National Aeronautical Mobile
Services
Reserved for national allotments, with the exception of 123.45 MHz which is also
used as the worldwide air-to-air communications channel (see g)).
Air-to-air communications Designated for use as provided for in 4.1.3.2.1.
h) 123.7 - 129.6917
inclusive
International and National
Aeronautical Mobile Services
Specific international allotments will be determined in light of regional agreement.
National assignments are covered by the provisions in 4.1 S.9.
i) 129.7 - 130.8917
inclusive
National Aeronautical Mobile
Services
Reserved for national allotments but may be used in whole or in part, subject to
regional agreement, to meet the requirements mentioned in 4.1.8.1.3.
j) 130.9 - 136.875
inclusive
International and National
Aeronautical Mobile Services
Specific international allotments will be determined in light of regional agreement.
National assignments are covered by the provisions in 4.1.5.9.
(See the Introduction to 4.1 regarding the band 132 - 137 MHz.)
k) 136.9 - 136.975
inclusive
International and National
Aeronautical Mobile Services
Reserved for VHF air-ground data link communications.
Chapter 4 Annex 10 - Aeronautical Telecommunications
4.1.2.2.1 Requirements for mandatory carriage of equipment
specifically designed for 8.33 kHz channel spacing shall
be made on the basis of regional air navigation agreements
which specify the airspace of operation and the implementation
timescales for the camage of equipment, including the
appropriate lead time.
Note.- No changes will be required to aircraft systems or
ground systems operating solely in regions not using 8.33 kHz
channel spacing.
4.1.2.2.2 Until at least 1 January 2005, equipment
specifically designed for 8.33 kHz channel spacing shall be
safeguarded with respect to its suitability for the AM(R)S.
4.1.2.2.3 Requirements for mandatory carriage of equipment
specifically designed for VDL Mode 3 and VDL Mode 4
shall be made on the basis of regional air navigation
agreements which specify the airspace of operation and the
implementation timescales for the camage of equipment,
including the appropriate lead time.
4.1.2.2.3.1 The agreement indicated in 4.1.2.2.3 shall
provide at least two years' notice of mandatory camage of
airborne systems.
4.1.2.2.4 Until at least 1 January 2010, equipment
specifically designed to the VDL Mode 3 and VDL Mode 4
SARPs shall be safeguarded with respect to its suitability for
the AM(R)S.
4.1.2.3 In the band 117.975 - 137 MHz, the lowest
assignable frequency shall be 118 MHz and the highest
136.975 MHz.
4.1.2.4 In regions where 25 kHz channel spacing (DSBAM
and VHF digital link (VDL)) and 8.33 H z DSB-AM
channel spacing are in operation, the publication of the
assigned frequency or channel of operation shall conform to
the channel contained in Table 4-1 (bis).
Note.- Table 4-1 (bis) provides the frequency channel
pairing plan which retains the numerical designator of the
25 kHz DSB-AM environment and allows unique identpcation
of a 25 kHz VDL and 8.33 kHz channel.
4.1.3 Frequencies used for
particular functions
4.1.3.1 Emergency channel
4.1.3.1.1 The emergency channel (121.5 MHz) shall be
used only for genuine emergency purposes, as broadly outlined
in the following:
a) to provide a clear channel between aircraft in distress or
emergency and a ground station when the normal
channels are being utilized for other aircraft;
Table 4-1 (bis). Channelling/frequency pairing
Frequency Time Channel
( MHz) slot * spacing (kHz) Channel
11 8.0000 25 118.000
etc.
* Time slot indication is for VDL Mode 3 channels. (Ref. Annex 10,
Volume 111, Part I, Chapter 6 for characteristics of VDL Mode 3
operation)
b) to provide a VHF communication channel between
aircraft and aerodromes, not normally used by international
air services, in case of an emergency condition
arising;
Annex I 0 - Aeronautical Telecommunications Volume V
c) to provide a common VHF communication channel 4.1.3.1.5 The emergency channel shall be guarded on a
between aircraft, either civil or military, and between single channel simplex operation basis.
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