GP940E 01/97
27.02.97
20
To be read together with the main terms of approval to which this is an Annex. It is recommended that a copy
of the approval document including annexes is kept with the equipment concerned, for the use of pilots and
Official Observers.
Pilot's Responsibility.
It is the responsibility of the pilot to ensure or to note the following:
A1
Signal Strength
- That the antenna is positioned in order to give sufficient signal strength for IGC purposes.
No deliberate attempt must be made to inject data via the antenna or antenna port; any abuse of this may lead
to a future requirement to position antennas and the antenna port out of reach of the flight crew. Note that tests
show that carbon fibre skins covering some centre-sections attenuate the 1.5 GHz GPS signal, and also that
proximity to some metal fittings can also attenuate the signal.
A2
Geodetic Datum.
The FR has a fixed Geodetic datum of WGS84. Any start, turn, and finish, points must
be entered with lat/longs which are to this datum. PC-based conversions such as the US DMA MADTRAN pro-
gramme (non-copyright) are available from NACs and FAI. Other datum transformation programmes are avai-
lable from commercial software sources.
A3
Connection to Ports.
Although this approval does not presently require sealing of any ports, no unauthori-
sed data must be passed through any port during the time between takeoff and the start of the post-flight trans-
fer of data by an OO. See para 2.3 in the conditions of approval on page 2.
A4
Use in Motor Gliders (including self-sustainers):
A vibration sensor is built in to the FR unit and attached
to the inside of the case, and must be used for checking the use of the Means-of-Propulsion (MoP), unless the
MoP is sealed (SC3 para 5.5.3.2) or inoperative (SC3 para 5.5.1/2).
A4.1
Use of vibration sensor for MoP recording.
The FR unit must be firmly attached to a part of the glider
structure which is capable of transmitting the vibration caused by the MoP to the case of the FR. The FR must
be sealed to the glider (para 3.2 on page 1 applies) unless the FR is out of each of the flight crew and an engine
run is carried out during the flight to prove the recording system. Where the FR is sealed by an OO to the
glider structure, the engine-run which proves the system may be carried out at any time between sealing and
unsealing the FR. It is understood that the manufacturer is designing a microphone-based system which, after
successful testing, may allow the above restrictions to be withdrawn.
A5
After Flight
- The pilot should ensure that the time and point of landing has been witnessed and recorded for
comparison with that recorded by the GNSS FR. Until an OO has witnessed the FR fit (installation) to the glider
and either downloaded the flight data or removed the FR for downloading, the pilot must not alter the FR instal-
lation to the glider. The OO will carry out the actions given in Annex B, and the downloaded flight data will be
kept secure to the OO and to NAC-approved persons only; the pilot may request a copy of the downloaded data.
A6
Calibration of Barograph Function.
Pilots are advised to have a barograph calibration carried out either
by the manufacturer or by an NAC-approved calibrator before any GNSS FR is used for a claimed flight perfor-
mance. Altitude and height claims require a calibration for the flight performance concerned, and speed and
distance claims need a calibration in order that the altitude difference between the departure and finish points
may be calculated. All claims require that (calibrated) FR takeoff and landing pressure altitudes are compared
with the separately-recorded QNH pressures. See Annex B para B5, and the Sporting Code for gliders, particu-
larly para 2.2.1.1.
A7
Entering Lat/Longs for turn points and flight declarations.
Note that lat/longs can only be entered as
degrees, minutes and seconds, there is no option at present for decimal minutes to be used.
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