and/or observe (for Mode 4 interrogations and
IDENT-MIC-OUT switch - Press to IDENT
10. MODE 4 TEST-ON-OUT switch - TEST.
12. MODE 4 TEST-ON-OUT switch - ON.
13. ANT switch - BOT.
14. Repeat steps 4, 5 and 6. Observe that the
TEST GO indicator illuminates.
15. TOP-DIV-BOT-ANT switch - TOP.
16. Repeat step 14.
17. TOP-DIV-BOT-ANT switch - DIV.
18. Repeat step 14.
19. When possible, obtain the cooperation of an
interrogating station to exercise the TEST
mode. Execute the following steps:
RAD TEST-OUT switch - RAD TEST.
Obtain verification from interrogating station
that a TEST MODE reply was received.
RAD TEST-OUT switch - OUT.
(4) Transponder set identification-position operating
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 required.
IDENT-OUT-MIC switch - Press momentarily to
IDENT, when directed.
will transmit identification-position
signals for 15 to 30 seconds. This
is normally sufficient time for
ground control to identify the
aircraft's position. During the 15 to
30 second period, it is normal
procedure to acknowledge via the
aircraft communications set that
identification/position signals are
Set any of the Ml, M2, M3/A, M-C, or
MODE 4 switches to OUT to inhibit
With the IDENT-OUT-MIC switch
set to the MIC position, the POS
IDENT button must be depressed
to transmit identification pulses.
(5) Shutdown procedure:
To retain Mode 4 code in external computer
during a temporary shutdown:
MODE 4. CODE switch - Rotate to HOLD.
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 automatically
zeroize the external computer unless codes have been
retained (step 1 above).
Transponder - Emergency Operation. Not
PILOT'S ALTIMETER INDICATOR.
The pilot's altimeter (fig. 3-26), in the upper left side
of the instrument panel, is a servoed unit, under control
of the Air Data Computer and is part of the Flight
Director/Autopilot system. 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 pressure values to be adjusted
and displayed in inches Hg or millibars. If AC power to
the altimeter is lost, a warning OFF flag will appear in
the upper counter drum display window to indicate
power loss, unreliable altimeter readings, and possible
loss of encoder transmissions to ground stations.
Circuits are protected by a 3-ampere fuse in the junction
box. When the BARO knob is adjusted to ground
supplied instructions, the updated altitude pressure is