Aspen Avionics Evolution Backup Display EFD1000 - Page 124

CHAPTER 6 EXPANDED EMERGENCY AND ABNORMAL PROCEDURES
Page 6-6
091-00027-001 REV A Evolution Backup Display Pilot’s Guide
Page 6-7
091-00027-001 REV A
Evolution Backup Display Pilot’s Guide
Airspeed going to zero is by far the most common symptom of a blocked pitot tube.
If you see either of these indications of a blocked pitot tube, the rst thing to do is turn
on the pitot heat to remove any ice blockage. This will quickly restore the attitude and
airspeed indications on the EBD systems (it takes about 40 seconds to recover after the
pitot pressure is restored).
To maintain proper aircraft attitude during the event (and if the heated pitot does
not work), use the outside horizon if possible, or use the backup attitude indicator to
continue safe ight. The autopilot attitude source is also independent of the EBD’s
attitude indicator and may be another means to maintain level ight. Use the autopilot
carefully and constantly monitor its performance against other ight instruments.
If in ight you suspect blocked static ports (probably due to icing), try switching to the
alternate static air source. If the static air sources are blocked, recognize that the readout
from the transponder and reports from ATC will be in error because of the blocked
static system.
If GPS altitude is available on your GPS navigator, become familiar with how the GPS
altitude is displayed. Although it can be in error, it might be your only source of altitude
information (WAAS GPS altitude is reasonably accurate).
If an instrument approach is necessary, consider a precision approach that will permit
vertical guidance with less reliance on the barometric pressure altitude indications.
091-00027-001 Rev A EBD Pilots Guide V&H .indb 6 8/27/14 8:51 AM