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Preflight Testing
Troubleshooting the Altitude Selector/Alerter

Kenny Poyner
Tech. Rep.

While going through the Altitude Selector/Alerter preflight test you can troubleshoot any wiring errors that may occur during installation by using the following guide.

• When power is applied, the unit performs a self-test of the computer electronics display annunciations, and the altitude alerter audio tone ('ding-dong"). Successful completion of self-test is indicated by the display of the barometric pressure setting of "29.9"(If the Altitude Selector/Alerter does not complete the self-test, check the wiring from pin 2 of the Altitude Selector/Alerter to A/P disconnect switch)
• Rotate the selector input knob to set baro setting to the nearest .1 in. hg. (if in millibars, push the baro switch to select the millibar scale)
• If the altitude selector is not receiving an encoder signal, the altitude (ALT) display will read 99.8 (99,800 ft.).
• Push the VS switch to activate VS selector then rotate the selector switch knob to input your desired climb (+) or decent (-) vertical speed. (If the select light is not displayed on the 60-2, 65, Fifty Five, or the Fifty FiveX remote annunciator and the VS numbers do not extinguish on the Fifty Five and Fifty FiveX then check the manual VS select wiring from pin 9 of the Altitude Selector/Alerter to pin of 54 PFGC (60-2,65) or pin 21 on connector P2 of system Fifty Five or Fifty Five X.)
• Push ALT to switch to access altitude select mode –ALT SEL.
• Engage the HDG mode on the autopilot.
• Simultaneously depress the VS and ALT switches on the autopilot programmer. (VS and ALT annunciations will both illuminate.) If you cannot get VS and ALT to illuminate together, check the ALT engage wiring from pin 10 of the Altitude Selector/Alerter, to pin 18 on the 60-2 programmer annunciator, and the system 65 remote annunciator, or pin 20 of the P2 connector on the system Fifty Five and Fifty Five X. Also check for the jumper between pins 1 and 2 of the optional flap/compensation connector on the system Fifty Five or Fifty Five X. Push VS select on Altitude Selector/Alerter and adjust VS with the select knob. The yoke should respond to changes in VS. If not, check the VS command wiring of pin 17 on the Altitude Selector/Alerter to pin 74 of PFGC (60-2, 65) or pin 22 of the P2 connector on the system Fifty Five and Fifty Five X.
• Press ALT switch to annunciate "ALT SEL." Press DTA switch to access data entry mode. While "SEL" is flashing, rotate the altitude selector knob to change your selected altitude to match field elevation. VS annunciation on autopilot programmer should extinguish when Altitude Selector setting is within 100ft. of indicated altitude on the altimeter. Extinguishing of VS annunciation with ALT remaining illuminated indicates the altitude hold mode has been engaged. (If VS does not extinguish check encoded ALT on Altitude Selector/Alerter to that of altimeter. If the Altitude Selector/Alerter has incorrect reading check grey code inputs from altimeter.)

If there are any questions about the set up of Altitude Selector/Alerter refer to the Altitude Selector/Alerter POH or call one of our technical support technicians in the Customer Service Department.