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that the smaller night-time pressure of the gas still fully
extends the envelope. Such a superpressure balloon will keep
essentially constant level until too much gas dzffuses out of it.
c) the balloon envelope is equipped with either a radar
reflective device(s) or radar reflective material that will
present an echo to surface radar operating in the
200 MHz to 2 700 MHz ftequency range, and/or the balloon
is equipped with such other devices as will permit
continuous tracking by the operator beyond the range of
ground-based radar.
3.4 A heavy unmanned ftee balloon shall not be operated
in an area where ground-based SSR equipment is in use,
unless it is equipped with a secondary surveillance radar transponder,
with altitude reporting capability, which is continuously
operating on an assigned code, or which can be turned
on when necessary by the tracking station.
3.5 An unmanned ftee balloon that is equipped with a
trailing antenna that requires a force of more than 230 N to
break it at any point shall not be operated unless the antenna
has coloured pennants or streamers that are attached at not
more than 15 m intervals.
3.6 A heavy unmanned ftee balloon shall not be operated
below 18 000 m (60 000 ft) pressure-altitude between sunset
and sunrise or such other period between sunset and sunrise
(corrected to the altitude of operation) as may be prescribed by
the appropriate ATS authority, unless the balloon and its attachments
and payload, whether or not they become separated
during the operation, are lighted.
3.7 A heavy unmanned free balloon that is equipped with
a suspension device (other than a highly conspicuously
coloured open parachute) more than 15 m long shall not
be operated between sunrise and sunset below 18 000 m
(60 000 ft) pressure-altitude unless the suspension device is
coloured in alternate bands of high conspicuity colours or has
coloured pennants attached.
4. Termination
The operator of a heavy unmanned ftee balloon shall activate
the appropriate termination devices required by 3.3 a) and b)
above:
a) when it becomes known that weather conditions are less
than those prescribed for the operation;
b) if a malfunction or any other reason makes further operation
hazardous to air traffic or to persons or property on
the surface; or
c) prior to unauthorized entry into the airspace over another
State's territory.
5. Flight notification
5.1 Pre-flight notification
5.1.1 Early notification of the intended flight of an
unmanned free balloon in the medium or heavy category shall
be made to the appropriate air traffic services unit not less than
seven days before the date of the intended flight.
5.1.2 Notification of the intended flight shall include such
of the following information as may be required by the
appropriate air traffic services unit:
a) balloon flight identification or project code name;
b) balloon classification and description;
c) SSR code or NDB frequency as applicable;
d) operator's name and telephone number;
e) launch site;
f ) estimated time of launch (or time of commencement and
completion of multiple launches);
g) number of balloons to be launched and the scheduled
interval between launches (if multiple launches);
h) expected direction of ascent;
i) cruising level(s) (pressure-altitude);
j) the estimated elapsed time to pass 18 000 m (60 000 ft)
pressure-altitude or to reach cruising level if at or below
18 000 m (60 000 ft), together with the estimated
location;
Note.- If the operation consists of continuous
launchings, the time to be included is the estimated time
at which theJirst and the last in the series will reach the
appropriate level (e.g. 1221 362-1 303302).
k) the estimated date and time of termination of the flight
and the planned location of the impact/recovery area. In
APP 4-3 24/11/05
Annex 2 - Rules of the Air Appendix 4
the case of balloons carrying out flights of long duration,
as a result of which the date and time of termination of
the flight and the location of impact cannot be forecast
with accuracy, the term "long duration" shall be used.
Note.- I f there is to be more than one location of
impact/recovery, each location is to be listed together
with the appropriate estimated time of impact. Ifthere is
to be a series ,of continuous impacts, the time to be
included is the estimated time of the first and the last in
the series (e.g. 0703302-0 723002).
5.1.3 Any changes in the pre-launch information notified
in accordance with 5.1.2 above shall be forwarded to the air
　
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