Figure 3-28. Pilot's Encoding Altimeter
Needle indicator. Indicates aircraft altitude in
hundreds of feet with subdivisions at fifty-foot intervals.
CODE OFF flag (pilot only). Presence
indicates loss of power to instrument.
ALT indicator. Not used.
Encoding Altimeter Normal Operation.
Turn-on procedure: Encoding altimeter will
operate when transponder is operating with M-C switch set to
Barometric set knob - Set desired
altimeter setting in IN. HG. window.
CODE OFF flag Check not visible.
Needle indicator Check operation.
If the altimeter does not read within 70 feet
of field elevation, when the correct local
barometric setting is used, the altimeter
needs calibration or internal failure has
occurred. An error of greater than 70 feet
also nullifies use of the altimeter for IFR
Altimeter circuit breaker Pull (if encoder fault occurs).