Section 917
ASPEN EFD1000/500 System
Page Date: 19. February 2014
917 - 9
Pilot´s Operating Handbook US
EXTRA 330LX
Battery operation should be expected any time the aircraft charging system is unable to maintain
a voltage at the EFD of 12.3 V. Under these circumstances, should the aircraft dispatch the EFD
will transition to battery shortly after reaching flying speed.
917.7.6
GEOGRAPHIC RESERVATION
N O T E
Use of the EFD1000 in the region within 750 nautical miles of the magnetic North or South
Pole, based solely upon the attitude and heading data provided by the EFD1000, is not
recommended.
The ADAHRS solution in the EFD1000 uses multiple inputs, including the earth’s magnetic field,
to determine aircraft heading, pitch and roll. The system must be able to periodically sense the
earth’s magnetic vector to be able to correctly resolve heading and stabilize the ADAHRS attitude
solution.
All magnetic sensors, including the one in the EFD1000, will experience degraded performance in
the vicinity of the earth’s magnetic poles. When the horizontal component of the earth’s magnetic
field is no longer strong enough to provide reliable heading data, the EFD1000 will detect this
condition and compensate for the reduced magnetic fields. The system can continue to operate
for a short time without reference to magnetic North, but must be able to periodically resolve the
magnetic vector to continue operations.
If the EFD1000 is unable to resolve the earth’s magnetic field for two minutes, the system will switch
to and annunciate Free Gyro Mode. In this mode, the ADAHRS continues to provide attitude and
heading data based on gyro-only operating logic. This will be accompanied by a „FREE GYRO
MODE“ message posted on the HSI, and a „CROSS CHECK ATTITUDE“ annunciation posted on
the attitude indicator. Under these circumstances, increased vigilance and instrument cross check
is required.
If the weak magnetic conditions persist, and the EFD1000 is unable to resolve the magnetic vector
for six minutes or greater, then the attitude and heading solution will be considered failed and will
be removed (i.e. Red X’d). The ADAHRS solution will automatically restore once the magnetic vector
can again be resolved.
Within a region approximately 750 nautical miles from the magnetic pole, the conditions described
above are expected to be persistent.
917.7.7
HAZARD AWARENESS (EFD1000 PFD PRO AND MFDS ONLY)
N O T E
Maneuvering based solely on the EFD1000 terrain and obstacle display is extremely
dangerous and prohibited. Pilot in command has the responsibility to see and avoid
terrain and other obstacles.
Summary of Contents for 330lx
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