Navigation Flashcards
LWINS
Light Weight Inertial Navigation System - Total of 3 navigation sets with interface to the GPS to provide navigation data to MCs and attitude data to FCCs
MAGR
Miniature Airborne GPS Receiver - Uses satellite and internal computers to provide date, time, lat/long, altitude, velocity to INS and MCs
Kalman Filter
Mathematical program that blends GPS data with INS data to provide accurate position
TACAN Range
Up to 390 nm
PARTIAL NAV READY advisory
A single INS has completed full alignment
NAV READY advisory
All 3 INSs have completed alignment
Figure of Merit (FOM)
Displayed in the upper left corner of the PFD, VSD, and Hover Display. It represents the quality of the position data used for navigation. The Lower the number the more accurate the position.
FOM 1
Less than 26 meters position error
FOM 2
26-50 meter position error
FOM 3
51-75 meter position error
FOM 4
76-100 meter position error
FOM 5
101-200 meter position error
FOM 6
201-500 meter position error
FOM 7
501-1,000 meter position error
FOM 8
1,001-5,000 meter position error
FOM 9
Greater than 5,000 meter position error
DEGRADED NAV READY advisory
At least one LWINS is in degraded NAV mode meaning that less than full navigation mode but better than attitude mode.
POSITION DISAGREE Advisory
There is a difference in position of more than 250 meters between any of the LWINS
GPS MONITOR FAULT Advisory
GPS horizontal or vertical limit has been exceeded or it is unusable to detect and report an exceedence due to less than 5 satellite vehicles
GPS PERFORMANCE DEGR Advisory
GPS solution is degraded due to poor satellite signal quality or it is not in sync with LWINS
Range to Display a JOG in CHART mode of the NAV Layer
10nm (1:250,000 scale)
Range to Display a TPC in CHART mode of the NAV Layer
20nm (1:500,000 scale)
Range to Display a ONC in CHART mode of the NAV Layer
40nm (1:1,000,000 scale)
TRN Mode of the NAV Layer
Digital Terrain Elevation - Presents geo-referenced presentation of terrain features
IMAGE Mode of the NAV Layer
Black and White satellite image of the terrain
DATA FRAME Mode of the NAV Layer
Stores up to 100 scanned images that can be stored and displayed on the MFD. Includes: Photographs, Pages from NATOPS, Approach Plates etc.
Switch labeled FOV on the track handle, locate left of the hat switch
It is the Range Switch which allows the pilot to change the map range. Push forward to increase or aft to decrease the range
Button labeled POL on the track Handle , located below the Range switch on the left side of the track handle
Function Cancel Button, allows cancelling of the selected map function
Button labeled MAN on Track handle, located directly aft of the hat switch
Center Cursor button used to center the map display about the map cursor
Hat switch on the track handle (Labeled SLEW)
Slew/Designate switch, allows the pilot to control the movement of either the map cursor over the map or under the cursor. Pressing the switch captures whatever is under the cursor
ENHANCED FPLN Mode
Mission Computer calculates power and fuel data: 1) Future power, 2) power available, 3) power required. 4) Fuel calculation for both current and future legs
LEG END key of the Hover Performance Menu
The leg parameters “at the end” of the selected leg are used as inputs into the hover performance calculations.
CUR FPLN CONFLICT Caution
Active flight plan’s Electronic Order of Battle (EOB) queue has at least one unacknowledged threat conflict. Meaning that the DDMS has determined that a threats detection ring plus a radius EOB buffer value intersects a leg of any flight plan.
RMU
Removable Memory Unit - Stores map representations and provides a storage location for all DDMS data and supplies digital data to the Display Electronics Unit (DEU).
Data stored on RMU
Aeronautical Charts (CHART), Digital Terrain (TRN) Elevation Data, Controlled Image (IMAGE) Base, and Data Frames (DATA FRAME).
UPD/STOR function of the Mission Management System
Allows pilots to create up to 45 waypoints by overflying a position or by using the FLIR
Range of numbers assigned to overfly waypoints
950 to 994
What is the total number of flight plans and legs available at any one time in the Mission Management System
5/100
Go Around Button
Pinky on TCL. Used to transition from hover or low speed flight to 100 kts. (If activated above 100 kts it will maintain airspeed at activation.
ALT REF Button
Pointer finger on TCL. Enables selection current altitude as reference altitude on FDP and engages altitude hold mode
Where are LWINS located
All 3 are in the left avionics closet
According to Assault Support Tactical Standard Operating Procedures Routes shall be named using ___
State names
Low altitude environment is defined as ___
500ft and below
Medium altitude environment is defined as ___
500ft to 13,000ft
High altitude environment is defined as ___
13,000ft and above
How are route checkpoints named
Named after cities within the state the route is named for
Planning Airspeeds
Max Range - 200 KCASCruise - 220 KCASTactical - 240 KCAS
Height Above Threshold on the MAP Layer
Used when terrain avoidance is required to accomplish a mission when flying low altitude tactics. A translucent yellow or red overlay is placed on terrain above the selected altitude.
GPS Almanac
Contains orbital data on all the GPS satellites which the GPS receiver uses to identify the location of a particular satellite
How long is GPS Almanac good for
30 days
