Airtec Expert CYPRES 2, User Manual

Page: 27 / 74

page 26 - CYPRES 2 User’s Guide -
4.3 When to switch on or reset
As a rule, CYPRES has to be switched on at the
takeoff site on the ground. Just prior to donning
your rig is an ideal time. It should never be switched
on inside an aircraft, helicopter, balloon, etc.
To reset CYPRES, switch off and then on again.
The unit will then re-calibrate and „zero“ itself to
this elevation.
When the takeoff airfield and intended dropzone
are in the same location, and all jumping activity
is restricted to that place, an initial switch-on at
the dropzone will suffice for any number of jumps,
provided they all take place within 14 hours. Should
any of the following situations occur, CYPRES
must be reset before the next jump:
• The dropzone is missed and the landing takes
place in an area with an elevation greater than
30 feet (10 m) above or below the dropzone
level. Or, on the return journey to the dropzone
the ground elevation changes similarly.
• The unit is taken away from the airfield/drop -
zone by vehicle or on foot and later brought
back again.
• If the total time for a flight or a flight with
jump (takeoff to landing) exceeds one and a
half hours, CYPRES will function normally,
but must be reset after landing as the weather
could have changed the ambient air pressure
significantly in the meantime.
General recommendation: If in doubt, reset
CYPRES.
When the takeoff airfield and intended dropzone
are in different locations, CYPRES must be
switched on at the departure airfield. Prior to each
jump, on return to the airfield from the dropzone,
it must be reset again before takeoff.
When the takeoff airfield and intended dropzone
are at different elevations, CYPRES must be
switched on at the departure airfield and adjusted
to the elevation of the dropzone (see Section
4.4.1).This is extremely important when making
demonstration/display jumps. Prior to each jump,
on return to the airfield from the dropzone, it must
be reset before jumping again.