mission by the RT859/APX72 when so
is returned to the RT859/APX72 for trans-
selected at the C6280(P)/APX.
mission to the interrogating source. The opera-
c. Control, Transponder Set C-6280(P)/
tion of the KIT1A/TSEC is classified.
APX. The C6280(P)/APX provides the con-
e. Pressure Altitude Digitizer CPU-66/A
trol functions for the RT-859/APX72. It
(or equivalent). The RT-859/APX-72 can be?
controls the application of source power, pre-
operated without the CPU66/A. When used,
sets the modes and codes (except mode 2 code
the CPU66/A receives mode C interrogations
setting), and selects the enabling switches
from the RT859/APX-72, generates a coded
which determine the modes of operation for
reply pulse (indicating aircraft pressure alti-
which the RT859/APX72 will function. The
tude in hundreds of feet), and returns this
C-6280(P)/APX also selects the degree of
code reply pulse to the RT859/APX72 for
RT-859/APX-72 sensitivity and the identifica-
transmission to the interrogating source.
tion of position and emergency output func-
f. Test Set, Transponder Set TS-18.43/APX.
The RT859/APX72 can be operated without
d. Computer KIT-1A/TSEC. The RT-859/
the TS1843/APX. When used, the TS-1843/
APX72 can be operated without the KIT
APX is activated by controls on the C-6280
lA/TSEC. When the KIT1A/TSEC is con-
(P)/APX and provides signals for processing
nected, mode 4 interrogations bypass the
by the RT859/APX72. The processed signals
decoder in the RT-859/APX72 and are ap-
are returned to the TS1843/APX which then
plied directly to the KIT1A/TSEC. The coded
activates a test light on the C6280(P)/APX
interrogation pulse is decoded in the KIT1A/
TSEC and a coded reply pulse generated which
if the proper response has occurred.
Section IV. SERVICE UPON RECEIPT OF EQUIPMENT
111. The gross weight of the pack-
aged mountings is approximately ½
a. Packaging Data. The RT-859/APX-72,
pound for the MT3809/APX72,
MT-3809/APX-72, and MT-3948/APX-72 are
and 5/8 pound for the MT-3948/
packaged individually for shipment.
(1) The RT859/APX-72 is enclosed in
b. Removing RT859/APX72.
a plastic bag, surrounded by con-
(1) Place the outer container in a loca-
toured corrugated cardboard filler,
tion that provides vertical clearance
placed in an inner packing carton,
of at least twice the container height
and then sealed in a barrier bag. The
when standing upright.
barrier bag and contents are placed
in a shipping carton approximately
(2) Keep the container upright and open
10 inches high, 16 inches deep, and
the top of the container.
8½ inches wide. The volume of the
(3) Remove the contents of the con-
complete package is 0.7 cubic feet
tainer, and remove the barrier bag
and the gross weight approximately
from around the inner packing car-
22 pounds. A typical shipping config-
uration and its contents is shown in
(4) Place the inner packing carton in an
upright position, and open the top of
(2) MT-3809/APX-72 and MT-3948/
APX-72 are packaged and shipped
(5) Remove the contents of the carton,
individually in contoured corrugated
and then remove the cardboard filler
cardboard as illustrated in figure