an 4MPH and 50 feet, respectively. However, opening the vent win-
ivs results in large errors which increase with increasing airspeed,
xor example, at the placarded maximum window open speed of 120 MPH,
the airspeed indicator and altimeter will read low by as much as 12 MPH
and 90 feet, respectively. To avoid these large errors the windows
should not be open when using the alternate static source.
MICROPHONE-HEADSET
Amicrophone-headset combination is offered as optional equipment.
Using the microphone-headset and amicrophone keying switch on the left
side of the pilot's control wheel, the pilot can conduct radio communica¬
tions without interrupting other control operations to handle ahand-held
microphone. Also, passengers need not listen to all communications.
The microphone and headset jacks are located near the lower left corner
the instrument panel.
7-3
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