Pitot Static Malfunction - Cirrus DESIGN SR20 Information Manual

Cirrus Design
SR20

Pitot Static Malfunction

Static Source Blocked
If erroneous readings of the static source instruments (airspeed,
altimeter and vertical speed) are suspected, the alternate static source
valve, on side of console near pilot's right ankle, should be opened to
supply static pressure from the cabin to these instruments.
If selecting the alternate static source does not work, in an
emergency, cabin pressure can be supplied to the static
pressure instruments by breaking the glass in the face of the
vertical speed indicator. When static pressure is supplied
through the vertical speed indicator, the vertical speed UP-
DOWN indications will be reversed (i.e., the needle will
indicate UP for descent and DOWN for climb).
With the alternate static source on, adjust indicated airspeed slightly
during climb or approach according to the Airspeed Calibration
(Alternate Static Source) table in Section 5 as appropriate for vent/
heater configuration.
1. Pitot Heat ...................................................................................ON
2. Alternate Static Source ......................................................... OPEN
Pitot Tube Blocked
If only the airspeed indicator is providing erroneous information, and in
icing conditions, the most probable cause is pitot ice. If setting Pitot
Heat ON does not correct the problem, descend to warmer air. If an
approach must be made with a blocked Pitot tube, use known pitch
and power settings and the GPS groundspeed indicator, taking
surface winds into account.
1. Pitot Heat ...................................................................................ON
P/N 13999-002 Info Manual
September 2011
• Note •
Section 3A
Abnormal Procedures
3A-11