C
IRRUS
D
ESIGN
S
ECTION
3A: A
BNORMAL
P
ROCEDURES
SR20
P
ITOT
S
TATIC
S
YSTEM
P/N 11934-005
3A-17
Pitot Static System
Static Source Blocked
Pitot Tube Blocked
1. Pitot Heat ................................................................................................... ON
2. Alternate Static Source ........................................................................ OPEN
Procedure Complete
• N
OTE
•
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 instru-
ments. With the alternate static source on, adjust indicated
airspeed slightly during climb or approach in accordance with
as appropriate for vent/ heater
configuration.
1. Pitot Heat ................................................................................................... ON
Procedure Complete
• N
OTE
•
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 ground
speed indicator, taking surface winds into account.
Reissue A