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 10deg 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)
If the FMC cruise altitude is FL 250 and the clearance alt FL190 is set in the MCP what pitch mode FMA will display when FL190 is captured
VNAV ALT (or ALT if not in VNAV)
What is the end descent point (E/D) for VOR approaches?
The missed approach point
- may be VOR, Rwy or named pt
What is the end descent point (E/D)for all approaches other than VOR
50ft above the rwy threshold
When does the FMC transition to “on approach” logic
NG: flaps are out of UP
Legacy:
1. Approach created, sequenced to FAF
2. Airplane is enroute to RWY waypoint and w/n 25nm of runway threshold
3. A published instrument approach selected and incorporated in the active flight plan and airplane sequenced to to first waypoint on published approach
If you are flying an approach with the FMC in “on approach’ logic and the airplane rises more than 150ft above the path the FMA pitch mode will change from VNAV PTH to what pitch mode
VNAV SPD
What condition or feature of the FMC allows us to set the missed approach altitude while in a VNAV PTH
Approach logic
When you execute a modded approach what altitude becomes the new cruise altitude
The highest altitude in the missed approach procedure
What thrust mode would you see on upper EICAS rolling an engine failure at V1 and the airplane has accelerated to VREF+98kts, flaps retracted
CON
What two databases are contained in the FMC
Nav database - Required for LNAV
Perf Database - Required for VNAV
What could happen if you advance the thrust levers further during TO1 or TO2 fixed rate, following an engine failure
Loss of directional control (VMCG)
Can you manually apply more thrust when conditions when conditions are necessary during an assumed temperature thrust reduction takeoff
Yes, not considered a limitation
During climb at what altitude does CLB 1 or CLB 2 debate thrust begin to increase linearly and at what altitude would CLB thrust be achieved
- At 10,000ft is when derated thrust begins to increase
- At 15,000ft is when full CLB thrust is achieved
What fuel value is usually issued by the FMC for performance calculations
CALC (calculated)
If you lose electrical power to the FMC and then it returns do you have to renter performance data on the PERF INIT page
Yes
Is the auto throttle available during dual FMC failure
NO
Are LNAV and VNAV available in alternate navigation
NO
What CDU pages are available during the alternate navigation
Alternate Nav legs
Alternate Nav progress
Alternate Nav radio
If the < FMC prompt is not displayed in line 1 when MENU is displayed on the CDU how do you display the alt Nav pages available
LEGS -> PROG -> NAV RAD
Is it ok for the pilots to enter information in both CDU’s at the same time
NO
What is meant by the DRAG/FF values in line 3L of the CDU Identification page
- Drag and fuel flow correction factor
+ intended to improve fuel predictions
+ uses performance monitoring software to calculate degradations
What happens when an active database expires in flight
The expired database is used until the active date is changed after landing
When do the ILS frequency and course and the word PARK display on the NAV/RAD page when en-route to the destination
- Less than 200nm from T/D
- More than halfway to the Destination
Or - upon manual landing
What is the maximum thrust reduction limit in terms of percentage when using assumed temperature
25%
When entering a thrust reduction THR HAA value in the MC Takeoff REF page do you have to add field elevation to the value
No, the FMC adds runway elevation to the entered HAA thrust reduction height causing thrust reduction at an MSL
How would the FMC handle a manually entered V1 speed less than V1min
FMC would display V1MIN in the header line and the value of V1MIN in the data line
On the legs page does the INTCPT COURSE line at R6 mean TO or FROM the active waypoint in 1L
TO the waypoint
What system logic features of the FMC Arrivals page allow a quick air turn back to the origin airport
Arrivals page
- less than 400 miles or less than 1/2 way to destination
- displays origin airport
Can the FMC display engine out performance limitations based on two engines out
Yes
On what page of the CDU could you find elevation for an airport in the database
REF NAV DATA
What is the difference between RNP and ACTUAL? Where is it displayed?
- RNP: Required Nav Pref
- ANP: Actual Nav Perf
- on POS REF page
Can you make manual entries to RNP or ACTUAL values
Can be made to RNP not ANP
On what page of the CDU could you enter the altitude or flight level where anti-ice would be first turned on during decent
Descent forecast page
If, while loading an approach to the destination during cruise you subsequently push the 6R key “APPROACH INTC” and then execute what would become the active waypoint? What would happen to any other pages or waypoints previously loaded?
The approach intercept fix would become the active waypoint and all other waypoints previously loaded would be deleted
On what page of the CDU could you find runway length for the selected runway
Approach reference page
What teardrop offset angle is used by the “hold’ page
40deg
What is commanded by pushing the MCP Alt Selector switch
- initiates early descent when within 50nm of t/d
- initiates cruise descent when more than 50nm away from T/D
- initiates climb or descent towards the altitude set in the MCP altitude window, when in VNAV PTH or VNAV ALT
- during climb or descent with altitude constraints each push will delete the next altitude constraint
- during a climb or descent with no altitude constraints and the altitude window is set above or below the FMC cruise Alt, it will change the crusie alt if outside the T/D
When flying an instrument approach with a PROC HOLD shader displayed at line L1 do you have to select EXIT HOLD and then EXICUTE to exit the holding pattern
NO, the FMC automatically commands an exit from the hold when the holding pattern is designated as a course reversal in lieu of a procedure turn
Which waypoints are referenced and displayed in magnetic and which waypoints are displayed in true on the alternate navigation LEGS page
Only thr active waypoint is referenced to magnetic north. All subsequent waypoint courses are true courses
