AUTOMATIC FLIGHT CONTROL SYSTEM

7.7 AFCS ANNUNCIATIONS AND ALERTS

AFCS STATUS ALERTS

The annunciations in Table 7-5 (listed in order of increasing priority) can appear on the PFD above the Airspeed and Attitude indicators. Only one annunciation occurs at a time, and messages are prioritized by criticality.

AFCS Status

Annunciation

Figure 7-40 AFCS Status Annunciation

Alert Condition	Annunciation	Description
Aileron Mistrim Right		Roll servo providing sustained force in the indicated direction
Aileron Mistrim Left
Elevator Mistrim Down		Pitch servo providing sustained force in the indicated direction
Elevator Mistrim Up
Pitch Trim Failure		If AP engaged, take control of the aircraft and disengage AP
Roll Failure		Roll axis control failure;AP inoperative
Pitch Failure		Pitch axis control failure;AP inoperative
System Failure		AP and MET are unavailable; FD may still be available
		Performing preflight system test; aural alert sounds at completion
		Do not press the AP DISC Switch during servo power-up and preflight
Preflight Test		system tests as this may cause the preflight system test to fail or never
		to start (if servos fail their power-up tests). Power must be cycled to
		the servos to remedy the situation.
		Preflight system test failed; aural alert sounds at failure

Table 7-5 AFCS Status Field Alerts

190-00498-03 Rev.A

Garmin G1000 Pilot’s Guide for Cessna Nav III

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AUTOMATIC FLIGHT CONTROL SYSTEM

OVERSPEED PROTECTION

NOTE: Overspeed protection is not active in Altitude Hold, Glideslope or Glidepath modes.

While Pitch Hold, Vertical Speed, Flight Level Change, Vertical Path Tracking, or an altitude capture mode is active, airspeed is monitored by the flight director. Pitch commands are not changed until overspeed protection becomes active. Overspeed protection is provided in situations where the flight director cannot acquire and maintain the mode reference for the selected vertical mode without exceeding the certified maximum autopilot airspeed.

When an autopilot overspeed condition occurs, the Airspeed Reference appears in a box above the Airspeed Indicator,flashingayellow‘MAXSPD’annunciation. Enginepowershouldbereducedand/orthepitchreference adjusted to slow the aircraft. The annunciation disappears when the overspeed condition is resolved.

Airspeed

Indicator

Figure 7-41 Overspeed Annunciation

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Garmin G1000 Pilot’s Guide for Cessna Nav III

190-00498-03 Rev.A