SECTION 6 – AUTOMATIC

FLIGHT CONTROL

Descent

While flying the GPS leg from Panoche VORTAC to Clovis VORTAC, the aircraft is cleared to make a descent to 3000 feet in preparation for the approach to KFAT. Three examples are presented:

•Flight Level Change descent

•Vertical Path Tracking descent

•Non-path descent using Flight Level Change Mode

Making a Flight Level Change descent:

1)Enter Flight Level Change Mode.

a)Using the ALT Knob, set the Selected Altitude to 3000 feet.

b)Press the FLC Key to activate Flight Level Change Mode. The annunciation‘FLC’ appears next to theAirspeed Reference,which defaults to the current aircraft airspeed, 142 knots. Altitude Hold Mode is armed automatically.

2)Reduce power to allow descent in Flight Level Change Mode. The autopilot maintains the Airspeed Reference.

3)As the aircraft nears the Selected Altitude, the flight director transitions to Selected Altitude Capture Mode, indicated by the green ‘ALTS’ annunciation flashing for up to ten seconds.

The green‘ALT’ annunciation flashes for up to ten seconds upon reaching 50 ft from the Selected Altitude;the autopilot transitions toAltitude Hold Mode and levels the aircraft.

Before VNAV flight control can provide vertical profile guidance, VNAV must be enabled on the MFD and a VNAV flight plan entered.

Vertical Path Tracking descent to VNAV Target Altitude:

1)Select VNAV flight control:

a)Using the ALT Knob, set the Selected Altitude below the VNAV Target Altitude of 3000 ft.

b)Press the VNV Key to arm Vertical Path Tracking Mode. The white annunciation‘VPTH’ appears.

Figure 6-34 FLC Descent

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FLIGHT CONTROL

c)If Vertical Path Tracking Mode is armed more than five minutes prior to descent path capture, acknowledgment is required for the flight director to transition from Altitude Hold to Vertical Path Tracking Mode. To proceed with descent path capture if the white ‘VPTH’ annunciation begins flashing,

Press the VNV Key OR:

Turn the ALT Knob to adjust the Selected Altitude

If the descent is not confirmed by the time of interception, Vertical Path Tracking Mode remains armed and the descent is not captured.

2)When the top-of-descent (TOD) is reached, the flight director transitions toVertical PathTracking Mode and begins the descent to the VNAV Target Altitude. Intention to capture the VNAV Target Altitude is indicated by the white ‘ALTV’ annunciation.

3)As the aircraft nears theVNAVTargetAltitude,the flight director transitions toVNAVTargetAltitude Capture Mode, indicated by the green ‘ALTV’ annunciation flashing for up to ten seconds.

The green ‘ALT’ annunciation flashes for up to ten seconds upon reaching 50 ft from the VNAV Target Altitude; the autopilot transitions to Altitude Hold Mode and levels the aircraft at the vertical waypoint.

Non-path descents can be flown while under VNAV guidance using Pitch Hold, Vertical Speed, or Flight Level Change Mode. Flight Level Change Mode is used for this example.

Non-path descent:

1)Command a non-path descent using Flight Level Change Mode:

a)Using the ALT Knob, set the Selected Altitude below the current aircraft altitude to 5,000 ft.

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Figure 6-35 VPTH Descent

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b)Press the FLC Key before the planned TOD during a vertical profile level leg (tracked using Altitude Hold Mode). The Airspeed Reference defaults to the current aircraft airspeed. Vertical Path Tracking and Selected Altitude Capture Mode is armed automatically.

2)Reduce power to allow descent in Flight Level Change Mode. The autopilot maintains the Airspeed Reference.

3)As the aircraft nears the Selected Altitude, the flight director transitions to Selected Altitude Capture Mode, indicated by the green ‘ALTS’ annunciation flashing for up to ten seconds.

The green‘ALT’ annunciation flashes for up to ten seconds upon reaching 50 ft from the Selected Altitude;the autopilot transitions toAltitude Hold Mode and levels the aircraft.

4)WhenthenextTODisreached,VerticalPathTracking becomes active (may require acknowledgment to allow descent path capture).

5)As the aircraft nears theVNAVTargetAltitude,the flight director transitions toVNAVTargetAltitude Capture Mode, indicated by the green ‘ALTV’ annunciation flashing for up to ten seconds.

The green ‘ALT’ annunciation flashes for up to ten seconds upon reaching 50 ft from the VNAV Target Altitude; the autopilot transitions to Altitude Hold Mode and levels the aircraft at the vertical waypoint.

Figure 6-36 Non-path Descent

6-30	Garmin G1000 Cockpit Reference Guide for the Cessna Nav III

Approach

Flying an ILS approach:

1)Transition from GPS Navigation Mode to Heading Select Mode.

a)Load the Runway 29R ILS approach for KFAT into the flight plan.

b)Select ‘VECTORS’ for the transition.

c)Use the HDG Knob to set the Selected Heading after getting vectors from ATC.

d)Press the HDG Key. The autopilot turns the aircraft to the desired heading.

		33	0
		30	3
		7	6
		2
1	GPS	Course	9

SECTION 6 – AUTOMATIC

FLIGHT CONTROL

2)Use Heading Select Mode to comply with ATC vectors as requested.

3)Tune the localizer frequency.

4)Press the APR Key when cleared for approach to arm Approach and Glideslope modes. ‘LOC’ and ‘GS’ appear in white as armed mode annunciations.

The navigation source on the HSI automatically switches to LOC. After this switch occurs, the localizer signal can be captured and the autopilot and flight director determine when to begin the turn to intercept the final approach course.

5)There are two options available at this point, as the autopilot flies the ILS approach:

•Push the AP DISC Switch at the Decision Height and land the aircraft.

•Use the GA Switch to execute a missed approach.

	VMode
GPS	NA

12

81

51

	122	291
		KFAT

HDG
Mode
LOC		APR/
GS
	Mode

2	3
Figure 6-37 ILS Approach to KFAT

5	025
SANGO
4	111
	075

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NOTE: Support for WAAS precision approaches is available only in installations with GIA 63W Integrated Avionics Units and when WAAS is available.

Flying a WAAS precision approach:

1)Arm flight director modes for a precision approach:

a)Make sure GPS is the selected navigation source (use CDI Softkey to change navigation source).

b)Load the Runway 29R LPV approach for KFAT into the flight plan.

33	0
30	3

7 2

2)Press the APR Key once clearance for approach has been acquired. GPS Approach Mode is activated (provided the crosstrack error is less than 2 nm) and Glidepath Mode is armed.

3)Once the glidepath is captured, Glidepath Mode becomes active.

4)There are two options available at this point, as the autopilot flies the approach:

•Push the AP DISC Switch at the Decision Height and land the aircraft.

•Use the GA Switch to execute a missed

approach.

6

GPS		APR/
GP
	Mode

2

Figure 6-38 LPV Approach to KFAT

6-32	Garmin G1000 Cockpit Reference Guide for the Cessna Nav III