NAVIGATION Flashcards
What does the IRS ON battery (BAT) light indicate on the
Overhead Maintenance Panel?
IRS operating on backup electrical power (APU hot battery bus)
FCOM, VOL 2; 11.10.11
When is full alignment of the IRS required?
When the time from the last full alignment to the next expected
arrival time exceeds 18 hours.
FCOM, VOL 2; 11.20.3
What CDU pages are available during Alternate Navigation?
•Alternate navigation LEGS
•Alternate navigation PROGRESS
•Alternate navigation RADIO
FCOM, VOL 2; 11.50.2
Can clear air turbulence be sensed by weather radar?
No, turbulence can only be sensed when there is
sufficient precipitation.
FCOM, VOL 2; 11.20.8
How many FMCs are provided?
Two FMCs (flight management computers L and R)
FCOM, VOL 2; 11.30.1
What factor determines “Econ” speed?
•Cost index
FCOM, VOL 2; 11.31.4
What VNAV Pitch mode would you expect at arrow
#3 and arrow #4 with a “climb via” clearance?
•#3 VNAV SPD
•#4 VNAV PTH
FCOM, VOL 2; 11.31.22
If you are flying an approach with the FMC in “on approach” logic,
and the airplane rises more than 150 feet above the path,
the FMA pitch mode will change from VNAV PTH to
what pitch mode display?
•VNAV SPD
FCOM, VOL 2; 11.31.29
On a -400F Legacy FMC, when does the approach phase of the
FMS start,also know as “on approach logic”?
•When the initial fix of an approach sequences
•When the runway is the active waypoint and
within 25nm
FCOM, VOL 2; 11.31.2
NG FMC, “on approach” logic occurs under any of the following conditions?
•Descent phase flaps out of up
•First waypoint sequenced of active nav database
•Aircraft less than 12NM from destination airport directto or
intercept course-to active waypoint and a manually entered
end of descent altitude constraint is lower than the destination
airport plus 500 feet
•The runway or missed approach point is the active waypoint and
the airplane is within 25NM of the runway
FCOM, VOL 2 747-8; 11.31.35
Are there VMCG issues when applying additional thrust manually during
an assumed temperature thrust takeoff?
No, because the assumed temperature thrust setting is not considered
a limitation and VMCG is calculated from the full engine rated thrust.
FCOM, VOL 2; 11.32.3
What could happen if you advance the thrust levers further then
TO 1 or TO 2 fixed derate following an engine failure?
•Loss of directional control
FCOM, VOL 2; 11.32.3
When does the CDU message INSUFFICIENT FUEL display?
•Estimated fuel at destination is less than fuel reserve (FMC RSV)
entered on the PERF INIT page.
FCOM, VOL 2 747-8; 11.32.5
Can ATC monitor airplane position on the ground when the
transponder is in STBY?
No.
FCOM, VOL 2; 11.20.7
Are LNAV and VNAV available in alternate navigation?
No
FCOM, VOL 2; 11.50.1
What happens when an active database expires in flight?
•The expired database is used until the active date is
changed after landing.
FCOM, VOL 2; 11.40.7
How is the reference thrust changed from TO (D-TO, TO 1 or TO 2)
to CON on upper EICAS following an engine failure in flight?
•Automatically when airspeed exceeds VREF+98 and the flaps are up
•Pushing the THR switch on the MCP changes thrust limit to CON
•Accessing THRUST LIM page in CDU and manually selecting CON
FCOM, VOL 2; 11.31.35/.41.17, 4.10.4
What databases are contained in the FMC?
•Aero Engine (AEDB-performance)
•Navigation
•Operational Program Configuration (OPC)
•MAGVAR Tables
FCOM, VOL 2; 11.32.1
When will the FMC fail to sequence the active waypoint?
When more than 21 nm from the active route and
not on an offset route.
FCOM, VOL 2; 11.31.3
On the 747-8, What modes of operation are available for the MultiScan weather radar?
•Manual mode –operates like traditional radar with full control
over tilt and gain settings
•Automatic mode –collects data from multiple scans and merges
information into a total weather picture.
FCOM, VOL 2; 11.31.3
On the 747-8, does the MultiScan weather radar provide turbulence
detection capability?
•Yes –Displays magenta for moderate to severe turbulence when
there is sufficient precipitation.
(Clear air turbulence cannot be sensed by the radar)
FCOM, VOL 2; 11.31.3
When armed for takeoff, when does VNAV activate?
400 feet
FCOM, VOL 2; 11.31.22
If the FMC cruise altitude is FL 250 and the clearance altitude of FL 190
is set in the MCP, what pitch mode FMA will display when FL 190 is captured?
•VNAV ALT
FCOM, VOL 2; 11.31.24
What VNAV FMA would display on the PFD during departure waypoint altitude constraints?
•VNAV PTH
FCOM, VOL 2; 11.31.23
What is the difference between RNP and ACTUAL? And where is it displayed?
•RNP is required navigation performance
•ACTUAL is Actual Aircraft Navigation Performance
•Displayed on FMC POS REF page
FCOM, VOL 2; 11.47.30
What is a conditional waypoint?
A conditional waypoint is based on a time or altitude requirement,
and not based on a land reference
- Indicated when an event occurs, and not a geographically fixed position,
i.e.., “when reaching 500 feet.”
FCOM, VOL 2; 11.31.5
