1-45
FLIGHT INSTRUMENTS
Pitot Static System
83.
Pitot Tube. A heated pitot tube on the
left wing supplies pitot pressure to the
airspeed indicator. The pitot heat switch is
located on the left subpanel. Pitot heat should
be used only when necessary to prevent icing.
84.
Static Ports. Two static pressure ports
located on both sides of the fuselage just aft of
the engine cowling supply static pressure to
the altimeter, ASI and VSI.
Figure 1-53 OAT Probe and Pitot Tube
85.
Alternate Static Air. An alternate static air valve is located adjacent to the parking brake
handle. Actuation of this valve (pull out) supplies static pressure from the cabin and should be
selected when erroneous instrument reading are suspected due to icing/clogging of the static
ports or water in the system.
Figure 1-54 Alternate Static Air
CAUTION
Cabin static pressure will vary depending on heat/vent settings
which may induce errors in instrument indications when the
alternate static source is selected.
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