Cessna 150 - RADIO TRANSMITTER SELECTOR SWITCH; TRUE AIRSPEED INDICATOR

RADIO TRANSMITTER SELECTOR SWITCH
Operation of the radio equipment is normal as covered in the. respec-
tive radio manuals. When more than one radio with transmitter function
is installed, a transmitter switch is necessary. The transmitter selector
switch is mounted in the upper left corner of the control pedestal and has
two positions. When two transmitters are installed, it is necessary to
switch the microphone to the radio unit the pilot desires to use for trans-
mission. This is accomplished by placing the transmitter selector switch
in the position corresponding to the radio unit which is to be used.
TRUE AIRSPEED INDICATOR
A true airspeed indicator is available to replace the standard airspeed
indicator in your airplane. The true airspeed indicator has a calibrated
rotatable ring which works in conjunction with the airspeed indicator dia :
in a manner similar to the operation of a flight computer.
TO OBTAIN TRUE AIRSPEED, rotate ring until pressure altitude
is aligned with outside air temperature in degrees Fahrenheit. Then
read true airspeed on rotatable ring opposite airspeed needle.
6-2
NOTE
Pressure altitude should not be confused with indicated
altitude. To obtain pressure altitude, set barometric
scale on altimeter to "29. 92'' and read pressure altitude
on altimeter. Be sure to return altimeter barometric
scale to original barometric setting after pressure alti-
tude has been obtained.