NAV Flashcards
How many routes (RTEs) can be stored in the Apache?
10
What are the (5) major components of the NAV system?
Embedded GPS Inertial (EGI) x2 Doppler Radar Velocity Sensor (DRVS) Air Data System (ADS) Radar Altimeter (RAD ALT) Automatic Direction Finder (ADF)
Where is the GPS antenna which provides signals to the EGIs located?
On top of the vertical fin
Where are the two EGI units installed?
Behind PNVS, in front of CPG
What does the GPS provide the EGI?
Position
What does the Doppler Radar Velocity Sensor (DRVS) provide the EGIs?
Velocity only
What does the Helicopter Air Data System (HADS) provide the EGIs?
latitudinal and longitudinal true airspeed and pressure altitude
What does the System Processor (SP) provide the EGIs?
manual updates
What does the Inertial Navigation Unit (INU) provide the EGIs?
horizontal and vertical linear accelerations and angular rates
What does the Kalman Filter (computer algorithm) within the EGI do?
combines all NAV and raw sensor data IOT provide an optimal estimate of Attitude, Position, HDG, Velocity, Acceleration, and Angular Rate
Where is the DRVS mounted and what does it provide?
In the bottom fairing
Velocity only
On power-up, the DRVS is defaulted to the ON position. To reduce radar detectability, can the crew turn off the DRVS?
YES
When will the Kalman Filter reject DRVS returns?
Flight over a smooth/glass type surface
ALT > 10,000 feet
Excessive bank angle
The High Integrated Air Data Computer (HIADC) accepts pneumatic inputs and process all of the Airspeed and Direction Sensors (AADS) IOT provide the FMC with:
Indicated Airspeed (LAT / LONG) True Airspeed (TAS) Altitude Rate, Static Pressure, Static Air Temperature
RAD ALT is located ______ and provides AGL information to the _______.
in the bottom fairing
SPs, DPs, WP, and the FMC
