Navigation Flashcards
Navigation subsystem consists of 10 things
2 EGI's 2 Air data computers ADC 1 air data transducer 1 air speed transducer Tacan set Direction finding group Radalt AFCS with digital Advanceed flight control computer AFCC Data transfer interface unit DTIU GPS Antenna System (GAS-1)
Navigation 6 functions
Navigation using ship and helo systems
Position keeping, using GPS coordinates
Position correction, used to correct errors due to helicopter navigation drift and buoy drift
Processing for FTP positions and generated flight path
Navigational inputs for sensor processing and display
Waypoints and flight plans to assist in helicopter navigation
INS
worldwide, passive, and self contained
determines aircraft attitude, heading, acceleration, velocity, and position
EGI Alignment types
GPS/HNAV In flight (IF) Gyro Compass (GC) Stored Heading (SH) Directional Gyro (DG) Data Link (DL)
HNAV occurs when
Default power on, can be commanded by pilot if LAT/LONG 0/0
Time for attitude verified
10 seconds
In flight (HNAV) occurs when
automatic with Weight off wheels; pilot initiated in flight
Directional Gyro occurs when
Pilot initiated, used for quick launch
Gyro compass occurs when
Pilot initiated quick ground alignment
Stored Heading occurs when
Quick ground alignment requires completion of a GC alignment, orderly shutdown and parking brake set
Data link alignment occurs when
Pilot initiated
Max Time for full alignment HNAV
15 minutes
Max Time for full alignment DG
2 minutes
Max Time for full alignment GC
4 minutes
Max Time for full alignment Stored heading
3 minutes
Max Time for full alignment Data link
10 minutes
What EGI mode do you need to take off
Heading verified HDGV-(G, GC, SH, DL)
FOM
1 best position error less than 25 meters
9 worst Position error greater than 5000 meters
What will you lose if EGI 2 goes down (no valid heading and velocity data)
Coupled approach and hover functionality
Alignment type that can’t give Valid heading
Directional Gyro
Valid heading for shore ops vs. ship ops
Shore - GPS, IF, GC, DL, SH
Ship - only GPS
Air to air tacan difference in channels
63 apart
Antenna that both EGI’s are connected to
EGI#2 also connected to?
GPS antenna system (GAS-1)
SATCOM/GPS
SAASM
Selective availability/anti-spoofing module
