CHAPTER 6 EXPANDED EMERGENCY AND ABNORMAL PROCEDURES
Page 6-4
091-00027-001 REV A Evolution Backup Display Pilot’s Guide
Page 6-5
091-00027-001 REV A
On the initial climb-out after takeo, it is also good practice to note and call out passing
through a pre-determined altitude above ground level (AGL) a couple of minutes after
takeo and ideally before entering the clouds (e.g., “2,000 feet”). If your primary and
backup instruments are not showing the altitude and airspeed you normally expect to
see at that point, you might have partially blocked static system ports. This AGL check
and call-out is also a good time to verify that no fuel is siphoning out from the fuel caps,
etc. If indications suggest a static system blockage, try switching to an alternate static
air source and consider landing to correct the problem.
In ight, if airspeed or altitude anomalies consistent with an obstructed pitot or static
line are observed, the pilot should recognize that the EBD’s attitude indication will soon
be compromised. If in IMC, immediately use the backup attitude indicator to y the
airplane and turn pitot heat ON if icing is suspected. If at any time there is suspicion
of an obstructed pitot or static line, use the EBD attitude indicator until the situation is
resolved
If the pitot tube becomes blocked in ight, the most common cause is icing. In-ight
indications of a blocked pitot tube are typically:
1) All airspeed indicators incorrectly show zero (or close to zero);
or
2) Airspeed in level ight does not change in response to changes in power or
drag and airspeed indications act like an altimeter (decreasing in a descent
and increasing in a climb, exactly the opposite of normal behavior).
091-00027-001 Rev A EBD Pilots Guide V&H .indb 5 8/27/14 8:51 AM
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