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The TCI D120-P2-T blind altitude encoder is located on the instrument panel floor, on the left side. The encoder connects to the static hose of the Pitot-static system. The encoder also connects to the transponder for mode C operation.
You can calibrate the output of the encoder to align with the airplane altimeter indication. Calibration potentiometers are next to the static port. Refer to the equipment manufacturer's manual for more data about the encoder.
% F. Sandia Aerospace Altitude Data System SAE5-35
% The Sandia Aerospace Altitude Data System SAE5-35 is located on the instrument panel floor, on % the left side, as shown in Figure 5. The encoder connects to the static hose of the Pitot-static % system. The encoder also connects to the transponder for mode C operation and to the one or two % GPS unit(s).
% You can calibrate the output of the encoder to align with the airplane altimeter indication. % Calibration buttons are located inside the case on the opposite side of the electrical connectors % behind slot A and slot B. Refer to the equipment manufacturer's manual for more data about the % encoder.
G. Transponder Antenna
The Bendix/King KA 60 transponder antenna is located on the bottom surface of the fuselage, under the cockpit on the left side.
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% % % % % % % % % % % % % % % % % % % % % % % Figure 5: Sandia Aerospace Altitude Data System SAE5-35 Installation %
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% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the transponder system. If you have the trouble % detailed in the Trouble column read across to the Possible Cause column. Then do the repair given % in the Repair column.
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Trouble  Possible Cause  Repair 
Transponder does not operate. Reply indicator does not come on when TST selected.  Faulty transponder. No power. Poor ground connection.  Replace the transponder. Repair faulty wiring, circuit-breaker etc. Do a test of the ground connection. 
ATC reports no reply. Transponder reply indicator flashes.  Low output power.  Examine the antenna connections. Replace the transponder. 
ATC reports no reply. Transponder reply indicator does not flash.  Airplane out of radar range. Poor received signal. Faulty transponder.  Do a test at higher altitude. Examine the antenna connections. Replace the transponder. 
ATC reports mode A does not operate. Mode C operates correctly.  Faulty transponder.  Replace the transponder. 
Encoded altitude is wrong at one or more altitudes but is correct at most other altitudes.  Data code-bit missing. Faulty encoder. Faulty mode C part of the transponder. Wiring open-circuit between encoder and transponder.  Do a mode C fault analysis. Replace the encoder. Replace the transponder. Repair/replace the wiring. Refer to the wiring diagrams in Chapter 92. 

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Trouble  Possible Cause  Repair 
Encoded altitude output is too high or too low over a steady range of altitudes. The airplane altimeter reads correctly.  Faulty encoder. Encoder requires calibration.  Replace the encoder. Calibrate the encoder. Refer to the manufacturers manuals. 
Altitude read-out is -800 ft.  Encoder not warmed-up.  Let the encoder warm-up (Refer to the blind encoder fault analysis in this Section). 
　
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