Flight Management System/Navigation Flashcards
When moving the mode selector of the IRS to OFF, the align lights illuminate for 30 seconds as the system goes through a shutdown sequence, T/F?
True.
When aligning the IRU’s it will normally take how long?
10mins (approx)
What lights should come on when the IRS selector is moved from OFF to NAV?
The ON DC momentarily, then the ALIGN.
How many IRU’s installed?
3.
What is the normal way of inserting the position in the IRS?
On POS INIT page in FMC.
Why does the ON DC light illuminate momentarily when the system is turned on?
Its a self test of the back up source of power.
What is the back up source of power for the Left IRU?
HOT battery bus.
With loss of all AC power, the Right IRU will initially?
Continue on DC for 5mins.
During alignment, flashing ALIGN lights could mean?
The system sensed, movement of the A/C, present position has not been entered, or entered position disagrees in excess of limits with last position.
What happens to the IRS when the mode selector is moved from OFF to NAV?
Initiates leveling and alignment with true north.
What page will appear on the CDU display when power is first applied during pre flight?
IDENT 1/1.
How does the FMC identify data needed by the system to be input by the pilot?
Dashes or boxes.
Which of the following FMC CDU pages will list the flight route in clearance language rather than detailed waypoint format?
RTE.
How can a departure SID be entered into your route of flight?
Using the Departure page.
All IRU’s are powered during extended operations using only the HDG/STBY power operating, T/F?
False.
Present position is normally updated to runway position when the EPR switch is pressed during takeoff on Non-GPS aircraft, T/F?
True.
What function does the RANGE selector have in the MAP and PLAN mode?
Selects MAP range.
The following will always be displayed when the HSI is placed in the MAP mode….?
Active route and tuned VOR and DME stations within the range selected.
What additional information is displayed on the HSI when the NAVAID switch on the HSI control panel is on?
Location of NAVAIDs in the data base.
Which indicates a modification to the active route?
Dashed white line.
Which identifies the active waypoint?
Magenta waypoint symbol.
What is the FMC database?
Navigational information stored in the FMC that is updated periodically.
When will the SET IRS POS latitude and longitude display blank?
When all IRSs enter the navigation mode.
How does the CDU identify an invalid entry by a crew member?
Msg on scratch pad.
Can the crew manually enter a different GMT on the POS INIT page?
Yes - but only the hour.
How can you display the RTE 2 page?
RTE 2 line select key.
How can a SID be entered into your route of flight?
Departure page.
What occurs when all IRUs enter the NAV mode?
The SET IRS POS line goes blank.
Which FMC route provides vertical and lateral navigation commands?
Route 1 or 2, which ever has been activated.
Why must data be entered on the PERF INIT page?
To initialize the vertical navigation.
What cost index should be entered if a max range speed is desired?
0
Where can speed and altitude restrictions be entered into the CDU?
LEGS page.
Where can a change of route be entered into the CDU?
LEGS or RTE page.
Where do the AFDS lateral navigational commands originate when LNAV is engaged?
FMC
When LNAV is selected, within which distance from the the active leg does LNAV engage?
2.5NM
A white LNAV annunciation on the ADI (FMA) indicates?
LNAV is armed.
With an autopilot in CMD, which MCP mode is used to turn the plane to an LNAV route intercept heading?
HDG SEL.
How are the pilots automatically notified if the current heading will not intercept the active LNAV track?
Scratch pad msg - NOT ON INTERCEPT HEADING
A green LNAV FMA annunciation on the ADI indicates?
LNAV is ingaged
What pitch and thrust modes result from engaging VNAV?
The modes commanded by the FMC.
What type of commands should the FMC be sending to the AFDS and auto-throttle when the aircraft symbol reaches the point labelled T/D on the HSI?
Descend.
Inflight, what CDU mode key would be used to display Vref?
INIT REF.
What does the DSPLY light on the CDU indicate?
The CDU is displaying data not related to the active leg, Hold or Speed Schedule
How is the FMC navigation affected if DME//DME or VOR/DME updating is lost?
The FMC will navigate using IRS inputs only.
What is indicated when boxes appear on the FUEL line of the CDU PERF INIT page?
The FMC is not recieving valid fuel quantity data.
Can clear air turbulence be detected by weather radar?
Turbulence can only be detected when there is sufficient precipitation.
What factor determines ECPN speed?
Cost Index
If you are flying an approach with the FMC in “on approach” logic, and the airplane rises significantly above the path, the FMA pitch mode will change from VNAV PTH to what pitch mode?
VNAV SPD.
