Aspen Avionics Evolution EFD 1000 MFD - CROSS CHECK ATTITUDE Message; Blocked Pitot or Static Line Suspected; Cross Check Attitude

CHAPTER 6 EXPANDED EMERGENCY AND ABNORMAL PROCEDURES
EFD1000/500 MFD Pilot’s Guide
Page 6-2 091-00006-001 REV B
EFD1000/500 MFD Pilot’s Guide
Page 6-3091-00006-001 REV B
Indication of an obstructed pitot system is provided for EFD1000s when congured as
a PFD, a MFD, and MFD in reversionary mode. If the EFD1000’s indicated airspeed is less
than 30 KIAS (35 mph) and GPS groundspeed is > 50 kts (58 mph), then attitude and
heading instruments are replaced with red “X”s and textual annunciations to indicate
their failure. In this case, an amber “CHECK PITOT HEAT” annunciation accompanies the
“ATTITUDE FAIL” annunciation. If the pitot obstruction is subsequently removed and
indicated airspeed ≥ 30 KIAS (35 mph), the “CHECK PITOT HEAT” annunciation will be
removed in 15 secs. This indicates that the EFD1000 is performing an automatic AHRS
reset in the background. No pilot action is required to reset the system.
Blocked Pitot or Static Line Suspected
1. PITOT HEAT .................................................................ON
2. ALTERNATE STATIC SOURCE .............................SELECT OPEN
3. ATTITUDE ....................................................................Maintain straight and level ight by
reference to standby sources of
attitude until the obstruction is
cleared
4. Consider exiting IMC
6.2. CROSS CHECK ATTITUDE Message
Persistent or frequent CROSS CHECK ATTITUDE annunciations during normal maneuvers
are indicative of a degraded ADAHRS solution.
Cross Check Attitude
1. ATTITUDE ....................................................................Maintain by reference to other
instruments or the visible horizon
2. Consider exiting IMC
CAUTION
Most light aircraft have only a single pitot and static
pneumatic system available for ight instrument
use. Should these lines become blocked, both the
standby indicators and the EFD1000 (PFD and MFD)
indicators will display erroneous airspeed and altitude
information.
The EFD1000 (PFD and MFD) also uses pitot and static
pressures as part of the attitude and heading solution.
Loss or corruption of this data will aect the accuracy
or availability of attitude and heading information.
If an erroneous pitot input is detected by the EFD1000
(PFD or MFD) in ight, the EFD1000 will present red “X”s
over the attitude and heading indicators, and display
an amber “CHECK PITOT HEAT” annunciation.
NOTE
The CROSS CHECK ATTITUDE message indicates that
the statistical condence in the ADAHRS solution is
degraded. Momentary annunciations may be seen
during aggressive maneuvers, such as 60 deg turns or
aerobatics, which are normal.