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6.7 Missed fixes
Some fixes may be missed or be assessed as spurious (see 10.7 for a description of
data anomalies). Where valid position data does not appear in the recording, the fixes must show pressure altitude to prove flight continuity. Missed position fixes from an otherwise continuous trace that lowers the actual
sampling rate to less than once per minute (for example, because of short term attitude or GPS system anomalies) is normally acceptable provided that an intermediate landing and take-off was not possible.
FLIGHT RECORDERS – INSTALLATION
7.1 Installing the FR in the glider
Any limitations or conditions for a FR or PR installation will be given in
its approval document. For flight safety, the position of displays and operating buttons and controls (including
switching by touch screens) used in single seat gliders should be close to sight lines used for pilot lookout and
scan for other aircraft.
a.
Connection to ports and antenna
Approval documents generally do not require the sealing of any
ports, plugs, or cable connections. If the FR is connected to the static port tubing (where allowed by its IGC
approval) the OO should ensure that there are no connections in the tubing that could allow alteration of
the static pressure and thereby give a false barograph reading.
b.
FRs using Environmental Noise Level (ENL) or MoP equipment
The FR must be so placed that engine
noise or, for MoP recorders, other data indicating engine use, is clearly received when the engine is producing thrust. The FR should not be covered or insulated, even if automatic gain would continue to ensure
high ENL or MoP readings under power.
7.2 Installation checks by an OO
There must be unambiguous evidence that every FR or PR present
in the glider for the flight concerned was correctly installed as in 7.1 above with either of two provisions described
in the FR’s IGC approval document. In summary, those provisions are:
a.
Sealing
At any date and time before the flight, an OO seals the FR to the glider structure in a manner
acceptable to the NAC. The seal must be applied and marked by the OO with initials or a symbol that provides unambiguous proof after the flight that the seal has not been compromised and the OO must be able
to identify the seal afterwards.
b.
Pre- or post-flight installation check
On the date of flight, an OO performs either:
• a preflight check of the FR installation, noting the date and time it was performed. The glider must then
be under continual observation by the OO until it takes off on the claimed flight, or
•
witnesses the landing and has the glider under continual observation until the installation of the FR is
checked. This is not only to ensure that the installation is in accordance with the rules, but also to
ensure that another FR has not been substituted before the data is downloaded to a computer following
the flight.
SC3 Annex C
12
2015