CYPRES 2 - 4.3 When to switch on or reset

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 aireld 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 sufce 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 aireld/drop-
zone by vehicle or on foot and later brought
back again.
• If the total time for a ight or a ight 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
signicantly in the meantime.
General recommendation: If in doubt, reset
CYPRES.
When the takeoff aireld and intended dropzone
are in different locations, CYPRES must be
switched on at the departure aireld. Prior to each
jump, on return to the aireld from the dropzone,
it must be reset again before takeoff.
When the takeoff aireld and intended dropzone
are at different elevations, CYPRES must be
switched on at the departure aireld and adjusted
to the elevation of the dropzone (see chapter
4.4.1).This is extremely important when making
demonstration/display jumps. Prior to each jump,
on return to the aireld from the dropzone, it must
be reset before jumping again.