TOP-DIV-BOT'-ANT switch TOP.
Repeat step 14.
TOP-DIV-BOT'-ANT switch DIV.
Repeat step 14.
When possible, obtain the cooperation
of an interrogating station to exercise
RAD TEST-OUT switch RAD
interrogating station that a TEST MODE reply was received.
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
momentarily to IDENT, when directed.
Holding circuits within the transponder
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
communications set that identification-
position signals are being generated.
Set any of the M1, M2, M3/A, M-C, or
MODE 4 switches to OUT to inhibit
transmission of replies in undesired modes.
With the IDENT-OUT-MIC switch set to
the MIC position, the POS IDENT button
To retain Mode 4 code in external
computer during a temporary shutdown:
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
automatically zeroize the external computer unless codes have
been retained (step 1.
Transponder Emergency Operation. Not applicable.
3-32. PILOTS ENCODING ALTIMETER.
Description. The encoding altimeter (fig. 328),
provides the pilot with an indication of present aircraft
pressure altitude above sea level. It also supplies information
to the transponder for Mode C (altitude reporting) operation
and to the aided inertial navigation system. The circuit is
protected by the 5-ampere PILOT'S ALT ENCD circuit
breaker on the overhead circuit breaker panel and the 1-
ampere F21 fuse in the No. 1 junction box.
Controls/Indicators and Functions.
barometric pressure in millibars. Adjusted by use of set knob.
IN HG window. Indicates local barometric
pressure in inches of mercury. Adjusted by use of set knob.
Drum indicator. Indicates aircraft altitude in
ten-thousands, thousands, and hundreds of feet above sea