IDENT-MIC-OUT switch Press to
MODE 4 TEST-ON-OUT switch ON.
ANT switch BOT.
Repeat steps 4, 5 and 6. Observe
that TEST GO indicator illuminates.
TOP-DIV-BOT-ANT switch TOP.
Repeat step 14.
TOP-DIV-BOT-ANT switch DIV.
Repeat step 14.
station to exercise the TEST mode.
Execute the following steps:
RAD TEST-OUT switch RAD TEST.
Obtain verification from interrogating
station that TEST MODE reply was
RAD TEST-OUT switch OUT.
operating procedure: The transponder set can make
identification-position replies while operating in code
Modes 1, 2, and/or 3/A, in response to ground station
interrogations. This type of operation is initiated by the
operator as follows:
Modes 1, 2 and/or 3/A ON, as
transponder receiver-transmitter will
signals for 15 to 30 seconds. This is
normally sufficient time for ground
position. During the 15 to 30 second
period, it is normal procedure to
identification/ position signals are
Set any of the M1, M2, M3/A, M-C, or MODE 4 switches
to OUT to inhibit transmission of replies in undesired
With the IDENT-OUT-MIC switch set to the MIC position,
the POS IDENT button on either control wheel must be
depressed to transmit identification pulses.
To retain Mode 4 code in external
MODE 4 CODE switch Rotate to
Wait 15 seconds.
MASTER control OFF.
To zeroize the Mode 4 code in the
external computer, turn MODE 4
CODE switch to ZERO.
MASTER control OFF. This will
computer unless codes have been
retained (step 1 above).
3-34. PILOT'S BAROMETRIC ALTIMETER INDICATOR
The pilot's barometric altimeter indicator (fig. 3-35), is
a servoed unit which displays altitude information from the
air data computer. Altitude is displayed by a 10,000 foot
counter, a 1000 foot counter, a 100 foot counter, and a
single needle pointer (coupled with the 100 foot counter)
which indicates hundreds of feet on a circular scale in 20
foot increments. Below an altitude of 10,000 feet, a
diagonal striped symbol will appear on the 10,000 foot
counter. The barometric pressure knob allows ground
supplied altimeter setting to be manually set. Altimeter
setting is displayed in inches of mercury and millibars on
Controls, Indicators and Functions.
Failure warning flag. The failure warning
flag, placarded OFF, comes into view when the error
between the altitude displayed and the signal received is
too great, the air data computer goes invalid, or the
barometric altimeter loses primary power. Pilot's
Barometric Altimeter Indicator
Altitude alert annunciator. The altitude alert
annunciator, placarded ALT, is illuminated when aircraft
is within 1000 feet of preselected altitude during capture
maneuver and extinguishes when aircraft is within 250
feet of preselected altitude. After capture, annunciator