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时间:2010-09-17 01:10来源:蓝天飞行翻译 作者:admin
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Extreme Pitch Indication
190-00600-02 Rev. A Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang 51
Abnormal Operation
Flight
Instruments EICAS
Nav/Com/
XPDR/Audio AFCS GPS Nav
Flight
Planning Procedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
Alerts Appendix Index
ead Reckoning
While in Enroute or Oceanic phase of flight, if the G1000 detects an invalid GPS solution or is unable to calculate a GPS position, the system automatically reverts to Dead Reckoning (DR) Mode. In DR Mode, the G1000 uses its last-known position combined with continuously updated airspeed and heading data (when available) to calculate and display the aircraft’s current estimated position. NOTE: Dead Reckoning Mode only functions in Enroute (ENR) or Oceanic (OCN) phase of flight. In all other phases, an invalid GPS solution produces a “NO GPS POSITION” annunciation on the map and the G1000 stops navigating in GPS Mode.
DR Mode is indicated on the G1000 by the appearance of the letters ‘DR’ superimposed in yellow over the ‘own aircraft’ symbol as shown in the following figure. In addition, ‘DR’ is prominently displayed, also in yellow, on the HSI slightly above and to the right of the aircraft symbol on the CDI as shown in the following figure. Also, the CDI deviation bar is removed from the display. Lastly, but at the same time, a ‘GPS NAV LOST’ alert message appears on the PFD.
Normal navigation using GPS/WAAS source data resumes automatically once a valid GPS solution is restored.
It is important to note that estimated navigation data supplied by the G1000 in DR Mode may become increasingly unreliable and must not be used as a sole means of navigation. If, while in DR Mode, airspeed and/or heading data is also lost or not available, the DR function is not be capable of estimating your position and, consequently, the system may display a path that is different than the actual movement of the aircraft. Estimated position information displayed by the G1000 through DR while there is no heading and/or airspeed data available should not be used for navigation.
DR Mode is inherently less accurate than the standard GPS/WAAS Mode due to the lack of satellite measurements needed to determine a position. Changes in wind speed and/or wind direction compounds the relative inaccuracy of DR Mode. Because of this degraded accuracy, the crew must maintain position awareness using other navigation equipment until GPS-derived position data is restored.
Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang 190-00600-02 Rev. A 52
Abnormal Operation
Flight
EICAS Instruments
Nav/Com/
GPS Nav AFCS XPDR/Audio
Flight
Procedures Planning
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
Index Appendix Alerts
Dead Reckoning IndicationsSymbolic Aircraft(Map pages and Inset Map)CDI ‘DR’ Indication on PFD
As a result of operating in DR Mode, all GPS-derived data is computed based upon an estimated position and is displayed as yellow text on the display to denote degraded navigation source information. This data includes the following:
• Navigation Status Box fields except Active Leg, TAS, and DTK
• GPS Bearing Pointer
• Wind data and pointers in the Wind Data Box on the PFD
• Track Bug
• All Bearing Pointer Distances
• Active Flight Plan distances, bearings, and ETE values
Also, while the G1000 is in DR Mode, the autopilot will not couple to GPS, and both TAWS and Terrain Proximity are disabled. Additionally, the accuracy of all nearest information (airports, airspaces, and waypoints) is questionable. Finally, airspace alerts continue to function, but with degraded accuracy.
190-00600-02 Rev. A Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang 53
Annunciations & Alerts
Flight
Instruments
EICAS
Nav/Com/
XPDR/Audio
AFCS
GPS Nav
Flight
Planning
Procedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/Alerts
Appendix
Index
Annunciations & Alerts
CAS Messages
Messages
Description
Inhibits
Warning
Caution
Advisory
ESI
TOPI
AIR
LOPI
ESDI
EMER
GND
AFT DOOR
Tailcone baggage door not fully secured
X
AFT JBOX CB L-R*
Start control circuit breaker (located in aft j-box) tripped
X
AFT JBOX LMT L-R*
Current limiter blown (located in aft j-box)
X
ANTISKID FAIL
Antiskid Control Unit cannot perform anti-skid functions
X
BATTERY O’TEMP
 
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