NAV SPECIFIC TECH Flashcards
FMS, RNP, 1553, GPS
What are the independent functions of each SP? (Ie computed individually)
FD commands
Nav solution
What does partitioned by time and space mean wrt the SPs?
designed to protect flight critical functions
Time-protects computational bandwidth for safety critical functions
Space-protects memory space/registers/dedicated interfaces
What does the Flight Management Function provide?
Navigation
Route Planning
LNAV/VNAV guidance
RTAs
Prog page predictions
Perf predictions
MCDUs
Datalink
NAV/COM sensor management
Data comms control and routing
What does EGI stand for?
Embedded GPS/ inertials
what does a blended INU/GPS solution provide?
Position
Attitude
Rate
Filtered update method
Fully populated Nav state vector
What are the characteristics of the pure INU solution?
Full Nav state vector
Long term drift due lack of position updating
What are the characteristics of the pure GPS solution?
No attitude information
Short term but high accuracy
What does the “gps not in civil” message mean?
GPS receiver has lost satellite reception
What can effect INU alignment time?
Latitude
Satellite availability
What does PRAIM display?
RAIM availability
RAIM hpl
RAIM alert status
What is the only system that sends data to both SPs not just the master?
EGIs due time critical nature
How does the comms system work between each channel/bus A/B?
Either A or B will be allocated as primary based on continuous health checks by the bus controller (using parity bit)
How are the buses separated to prevent battle damage?
A & B separated by at least one inch
1 & 2 separated down opposite sides of aircraft
What is important to note about 1553 intermittent failures?
If some info is still getting through the other bus may not take over
Only if a bus is severed completely will the traffic definitely transfer to the secondary bus
How do the SPs communicate using the 1553?
- If SP 1 is master, SP2 becomes a remote terminal on Bus 2
FMCn FAIL plus FMCn NOGO, and POSSIBLY SINGLE OPERATION; what does this mean?
How to ident between 1553 or SP issue
- You can only identify if it’s a 1553 issue not an SP issue by looking at the Equipment history and seeing stuff like TACAN 2 B2 BA FAIL
Why do you select SYS>PWR CTL>ALL ON after an SP event?
When two SP resets occur in quick succession (ie 1st reset isn’t complete) the EGIs will be powered off
How many ground monitoring stations and antennas does GPS have?
5 monitoring stations updating satellite Nav messages
3 antennas w uplink capability
Where is the zeroise function in the FMS?
Init Ref>zeroise
Where are the CMU pages in the MCDU?
ACARS > SYS menu > ATS menu
What is the code for the VHFs?
RTA-50D
What is the code for the VUHFs
AN/ARC210s
What does CMU stand for?
Comms management unit
What is the safety standoff for the civil SATCOM antenna? (2)
8.5feet
20feet for longer than 3min/hour