Garmin GTX 335 w GPS Installation Guidance page 47

11. Use the tabulation completed above and switch on all continuous electrical loads used in the
normal takeoff/landing phase. Record ammeter current reading. Measurements must be taken with
the landing lights ON and OFF (measurements (b1) and (b2) in figure 3-9). Follow these
precautions for this measurement:
• The autopilot circuit breaker should be closed, and the autopilot should be engaged.
• Use the tabulation completed above and switch on all continuous electrical loads used in
the normal cruise phase. Record the ammeter current reading (measurement (c) in
figure 3-9).
12. Use the tabulation completed above and switch on all continuous electrical loads used in the
emergency cruise phase. Record the ammeter current reading. Record the current drawn with the
landing light switched OFF and again with the landing light switched ON.
13. Use the tabulation completed above and switch on all continuous electrical loads that are used for
the emergency landing phase. Record the ammeter current reading.
14. Use the values measured and recorded. Complete the ELA using the blank electrical load
tabulation form in figure 3-9. Make sure the maximum demand does not exceed 80% of the
alternator data plate rating.
Electrical Load Tabulation
When the Pitot heat and landing light are switched on simultaneously it is permissible for electrical load to
exceed 80% of the alternator data plate rating during the takeoff/landing phase of flight.
Electrical load should:
Not exceed 95% of the alternator data plate rating
Not exceed 80% of the alternator data plate rating with the Pitot heat on and the landing light off
190-00734-17
Rev. 1
GTX 335 w/GPS Installation Guidance
Page 3-24