Garmin Software Version 1983.00 User's Guide Page 36

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Garmin G1000 Cockpit Reference Guide for the Piper PA-44-180 Seminole
190-01462-01 Rev. A
18
AFCS
Flight
InstrumentsEIS
Nav/Com/
XPDR/AudioAFCSGPS Nav
Flight
PlanningProcedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
AlertsAppendixIndex
UNDERSPEED PROTECTION
Underspeed Protection is available when the optional Electronic Stability and
Protection (ESP) system is installed and the autopilot is on.
When aircraft airspeed reaches 80 knots IAS, a flashing yellow ‘MINSPD’
annunciation will appear above the airspeed indicator.
If the aircraft continues to decelerate, Underspeed Protection becomes active.
V
ertical flight director modes can be divided into two categories: Those in
which it is important to maintain altitude for as long as possible (altitude-critical
modes), and those in which maintaining altitude is less crucial (non-altitude
critical modes).
Altitude-Critical Modes (ALT, GS, GP, TO, GA, FLC)
If the aircraft decelerates to stall warning, the lateral and vertical flight director
modes will change from active to armed, and the autopilot will provide input causing
the aircraft to pitch down and the wings to level.
An aural “AIRSPEED” alert will sound every five seconds and a red “USP ACTIVE”
annunciation will appear to the right of the vertical speed indicator (see Annunciations
and Alerts). The pitch down force will continue until the aircraft reaches a pitch
attitude at which IAS equals the IAS at which stall warning turns off, plus two knots.
When airspeed increases (as a result of adding power/thrust) to above the IAS at
which stall warning turns off, plus two knots, the autopilot will cause the aircraft to
pitch up until recapturing the vertical reference and the vertical and lateral flight
director modes will change from armed to active.
Non-Altitude Critical Modes (VS, VNAV, IAS,)
When the airspeed trend vector reaches a predetermined airspeed (specific to each
flap setting), a single aural “AIRSPEED” will sound, alerting the pilot to the impending
underspeed condition. If the aircraft decelerates to an IAS below the minimum
commandable autopilot airspeed, a red “USP ACTIVE” annunciation will appear to the
right of the vertical speed indicator. The vertical flight director mode will change from
active to armed, and the autopilot will cause the aircraft to pitch down until reaching
a pitch attitude at which IAS equals the minimum commandable autopilot airspeed.
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