FMS Flashcards
When do the ILS receivers tune and the frequency and course display after you select an ILS while inbound to the landing airport
When the airplane is within 150nm of the destination airport 50mn of the T/D or in FMC descent
How long is the ILS autotune inhibited after takeoff
- On initial takeoff ILS auto tuning is inhibited for 10min to prevent clutter on the PFD
- Selection and execution of a new approach in the active flight plan causes the ILS to autotune the new approach frequency even if this is accomplished during the 10 minute take off inhibit period
How could you autotune a new approach frequency during the 10 minute autotune inhibit period
Selection and execution of a new approach in the active flight plan
If the tuned frequency of a navigation station or an incorrect identifier displays instead of the correct Morse code identifier what should you do
Verify the identity of the tuned navigation from the audio Morse code from the radio tuning panel
In what transponder modes will the transponder activate beacon and altitude reporting to ATC when in flight
XPDR, TA ONLY and TA/RA
Can ATC monitor airplane position on the ground when the transponder is STBY or OFF
NO
Can clear air turbulence be sensed by weather data
No, only sufficient precipitation
How many FMS’s and how many FMC’s are provided?
- 1 FMS (whole system)
- 2 FMC’s (L&R) L norm master
How many hours would you meet the requirements for navigation if you had two IRU’s, one FMC, and two CDU’s as sole means of navigation
18 hours
When does the approach phase of the FMS start
When the first waypoint of the procedure sequences or when the runway is the active waypoint and the distance to go is less than 25miles
When will the FMC fail to sequence the active waypoint
When more than 21nm off the active route and not an offset route
What factor determines ECON speed
Cost Index
Larger values increase ECON speed
Entering zero results in max range and min trip fuel burn
Explain the concept of cost index
Optimize flight profiles balancing fuel consumption against time
What is a conditional waypoint
Based on a time or altitude requirement not based on geographical reference “reaching 400ft”
What determines present position of the airplane and where on the ND is it displayed
FMC displayed as the tip of the white triangle on the ND
How is the FMC position updated
Position updates in order:
GPS
DME-DME
VOR-DME
How is the FMC updated during an ILS/LOC approach
LOC updating when tuned to LOC associated with destination runway
What does a VD FMC radio position update status indicate and where is it displayed
VOR with collocated DME
- lower right corner of the ND
When does the FMS enter polar operation conditions
North or south of 84deg
When would you ever select the TRUE position on the heading reference switch?
For autopilot operations in high latitudes using a roll mode other than LNAV
When does the heading reference for PFDs NDs and RMI change to true north
- At 82°N (or north of 70°N between 80°W and 130°W)
- At 82°S (or south of 60°S between 120°E and 160°E)
When armed for takeoff when does VNAV activate
Climbing through 400ft
WHat VNAV climb profiles are used by VNAV and display in the pitch mode FMA during climb
VNAV SPD or VNAV PTH
What VNAV climb mode would display on the FMA during departure waypoint constraints
VNAV SPD and VNAV PTH (defined by CDU entries)