FMS Flashcards
What reference datum does the FMS use?
WGS-84
what 5 PBN requirements does the FMS satisfy?
- P-RNAV
- B-RNAV
- GNSS
- SBAS
- OCEANIC/REMOTE
in what FMS mode can we fly autopilot coupled non-precision approaches?
approach mode
what 3 components make up the basic FMS?
- pedestal mounted control display unit with integrated nav computer
- configuration module
- solid state data transfer unit
where does the FMS accept position information from?
- LRN sensors
- DME
- VOR
how are flight plans created?
using the navigation database which locates waypoints along a route and combines them to form a flight plan
what 8 things does the FMS’s nav database provide info on?
- navaids
- airports
- NDB
- enroute waypoints
- intersections
- airways
- SIDs
- STARs
- approaches
- runways
what 8 systems does the navigation computer interface with?
- RCU’s
- AHRS’s
- ADC
- DME’s
- TAWS
- DCU
- NAV 1
- SSDTU
- fuel flow sensors
- WOW sensors
what 5 sensors does the navigation computer process data from?
- DME
- VOR
- air data
- fuel flow
- up to 5 LRN sensors
what does the nav database have the capacity to store?
- 200 pilot defined locations
- 200 pilot defined routes
- 100 (each) pilot defined alignment points, airports approaches, and runways
- 100 average sized SIDS/STARS
how does the FMS determine position using DME?
- determines which DME stations are within 300 mile range
- sequentially tunes each of those stations
- interrogates each station, corrects distance for slant range using station elevation and aircraft altitude
where does the FMS derive the TAS from?
ADC
where does the FMS derive velocity information from?
GPS sensor
where does the FMS derive position information from?
GPS, DME, VOR
what does the FMS rely on for position information if out of DME range?
LRN sensors
what secondary navigational functions are available once the best computed position is obtained?
- course to waypoint
- ETA
- distance to waypoint
- wind
- groundspeed
what is the configuration module?
serially connected EEPROM designed to store config data specific to the aircraft installation
what is the solid state data transfer unit used for?
to load nav database revision cycles, TAWS, flight plans and other updates
where is the SSDTU located?
service panel on the RH avionics rack
how is the navigation database update provided?
on disks directly from universal on a 28 day revision cycle
what does the fuel management function of the FMS accept inputs from?
aircraft fuel flow sensors and information supplied by the pilot
is the fuel calculation reliable in fuel flow data mode if one fuel flow sensor fails?
no, the calculation is based on 2 fuel flow sensors
what will be displayed on the FMS if an engine is shut down/fails or a fuel flow sensor failure occurs?
FUEL FLOW FAIL MESSAGE
digital fuel flow readout will read FAIL on the fuel flow page for the respective engine/fuel flow sensor
what action should we take with regard to the FMS in case of an engine failure?
select the FAIL indication and press BACK and ENTER button
this makes sure the fuel calculation takes again the value of the fuel flow sensor in case the engine is restarted
if the fuel flow sensor has failed what should the pilot manually enter for the failed sensor?
a reasonable fuel flow value in place of the word FAIL
this will restart fuel calculation and related estimates for the remainder of the trip with the correct values
what should we refer to if there is a DATABASE EXPIRED warning on power up?
user manual
what does an amber MSG annunciation mean?
message is to be acknowledged on the MSG page
what does a WPT alert mean?
steady: lateral waypoint alert
flashing: vertical waypoint flight path angle alert
what does a SXTK annunciation mean?
FMS in selected crosstrack mode
what does FMS HDG annunciation mean?
FMS is in HDG mode
what does FMS APPR annunciation mean?
FMS is in APPR mode
what does LNAV annunciation mean?
LNAV level of service for SBAS approach is retained
what does LNAV/VNAV annunciation mean?
LNAV/VNAV level of service for SBAS approach is retained
what does LPV annunciation mean?
LPV level of service for SBAS approach is retained
what does an amber GPS INTEG annunciation mean?
RAIM not available or a fault is detected- DME may still be in use
what does an amber POS annunciation mean
FMS position uncertain alert
what does an amber DR annunciation mean?
FMS in dead reckoning mode
when a valid navigation leg is selected on the FMS, guidance info can be selected for display on the PFD how?
selecting FMS with the NAV/BRG SOURCE button o n the PFDCP on the pedestal panel
what is 2 dot deflection laterally in en-route mode?
5nm
what is 2 dot deflection vertically in en-route mode?
1500ft
what is 2 dot deflection laterally in terminal mode?
1nm
what is 2 dot deflection vertically in terminal mode?
500ft
what is 2 dot deflection laterally in approach mode?
2 degrees to 0.3nm, then linear
what is 2 dot deflection vertically in approach mode?
0.25 x glide path angle
when a valid navigation leg is selected on the FMS, how can FD lateral steering be selected?
LRN button on LH annunciator panel
in what plane is steering provided by the FMS in enroute?
lateral steering only
an appropriate vertical mode on the autopilot can be selected
how do we link approaches into the flight plan and laterally and vertically couple the autopilot?
selecting approach mode on the autopilot
what waypoints can b used as an approach point to land?
any
when will an approach automatically activate?
with approach mode armed, the aircraft track angle within 15 degrees of the final approach course and the aircraft being within 2nm of FAF
(latter applies for approaches without capture fix only)
how do we manually activate an approach using the FMS?
from any nav page LSK 3R and ACT APPR
what 3 things happen when an approach is manually activated on the FMS?
- all intervening waypoints from the present FR-TO leg to the first approach waypoint will be sequenced and HSI guidance will be to that waypoint
- desired track pointer will be set to the inbound course of the approach
- FMS will transition to HDG mode, and the pilot must manually set up the correct approach intercept angle. (normally coincides with ATC vectors)
if an approach has been manually activated, what must the pilot do once the intercept angle onto the FAT has been established?
press intercept LSK on NAV page 1 to allow interception of the final approach course
when is vertical navigation provided?
only with FMS in APPR mode
is enroute vertical deviation info fed to the FD?
no, it is advisory only
what is the LPV monitor?
an LRU in the LH avionics rack which incorporates a second GPS/SBAS receiver which acts as an additional navigation sensor input the FMS
What does the LPV monitor provide with regard to an LPV SBAS approach?
the necessary integrity monitoring during the final approach segment
what 2 pieces of equipment make it possible to fly SBAS approaches to LPV minima?
LP/LPV monitor and the FMS
what is correct operation of the LPV monitor indicated by?
LOS (level of service) annunciation on the PFD when an LPV approach is selected and armed.
what colour is the LPV output on the PFD?
Green, this also means LPV LOS is retained
what if we lose LPV LOS?
FMS MSG annunciator is triggered
what if predicted LOS is not available at approach activation?
message will alert the pilot that predicted LOS will be unavailable after crossing the FAF although the RNV APPR LOS page may show that it is in use.
a lower LOS should be selected
if predicted LOS is not available and selection of a lower LOS is not possible before crossing FAF what happens?
no vertical guidance is available and the approach must continue LNAV only
