Navigation Flashcards
What does the IRS ON BAT light indicated
The IRS is operating on backup power (APU hot battery bus).
When is full alignment of the IRS required?
When the time from the last full alignment to the expected arrival time is more than 18 hours (every flight).
What CDU pages are available during alternate navigation? (3 Items)
Alternate Nav LEGS
Alternate Nav PROGRESS
Alternate Nav RADIO
Can CAT be detected by weather radar?
No.
How many FMC’s are provided?
2 (L & R)
What factor determines ECON Speed?
Cost Index
What FMA vertical mode annunciation will be displayed when on the vertical path during VNAV operations? Off vertical path during VNAV operations? (2 Items)
VNAV PTH
VNAV SPD
During an approach in ‘approach logic’, and a 150’ altitude deviation is detected, FMA pitch mode will change from VNAV PTH to what?
VNAV SPD
On aircraft with a legacy FMC, when does approach logic begin? (2 Items)
When an IAF sequences, or
When the runway is the active waypoint, and the aircraft is within 25NM of the airport.
When does FMC approach logic engage? (4 Items)
During descent with flaps out of up,
First waypoint sequenced,
Aircraft within 12NM of the airport, direct to or intercept course to active waypoint and a manually entered altitude is less than 500’ AFE,
The runway or MAP is the active waypoint, and the aircraft is within 25NM of the runway.
Are there VMCG issues when applying additional thrust during an Assumed Temperature thrust takeoff?
No, because AT is not limiting, and VMCG is calculated from full engine rated thrust.
What could happen if you advance power past TO 1 or TO 2 following an engine failure?
Loss of directional control
When does the INSUFFICIENT FUEL message display.
When fuel at landing is expected to be below reserve fuel.
Can ATC monitor aircraft on the ground with the transponder in ‘STBY’?
No.
Are LNAV and VNAV available in alternate navigation?
No.
What happens when an active database expires in flight?
The expires database is used until landing.
How is the reference thrust changed to CON on the upper EICAS during an engine failure in flight? (3 Items)
Automatically when airspeed exceeds VREF +98 and flaps are up,
Pushing the THR switch on the MCP,
Manually selecting CON on the THRUST LIM page on the CDU.
What databases are contained in the FMC? (4 Items)
Performance,
Navigation,
Operational Program Configuration (OPC),
MAGVAR Tables
When will the FMC fail to sequence the active waypoint?
When more than 21NM from the active route and not on an offset.
On the 747-8, what options are available for the Weather Radar? (2 Items)
Manual Mode,
Automatic Mode
Does the 747-8 Weather Radar provide turbulence detection capability?
Yes (CAT can not be sensed).
When armed for Takeoff, when does VNAV activate?
Climbing through 400’.
If the FMC cruise altitude is set to FL250, and an MCP altitude of FL210 is set, what vertical mode will be displayed upon reaching FL210 with VNAV active?
VNAV ALT
What VNAV mode would be displayed during departure and arrival altitude constrains when a top or bottom altitude has been set?
VNAV PTH
Where is ANP/RNP displayed?
On the FMC, POS REF page.
What is a conditional waypoint?
Based on a time/distance/altitude, not a land reference. (Eg, at 500’ turn left to track to MYKIA.
How do you select the IRU mode selector from NAV?
By pulling and twisting the IRU knob.
What is the function of the ‘ALIGN’ position on the IRU selector? (2 Items)
Initiates Alignment, and
Clears Navigation Errors.
How long does it take for a full IRS alignment?
10 Minutes.
How do you accomplish a fast IRS alignment? (6 Items)
Airplane must be parked,
Position selectors to ‘ALIGN’,
Enter present position,
Reposition selectors to ‘NAV’
Takes 30 seconds,
Possible to do without selecting present position, however a greater navigational error will occur.
What happens when IRS alignment is lost in flight? (2 Items)
The Navigation mode is inoperative for the remainder of the flight, and
Attitude information can be displayed by positioning the selector to ‘ATT’.
What happens if the Center IRU is operating on DC power?
Power will continue to be supplied for 5 minutes, then the unit will shut down.
