NAVIGATION

Question 1

What does the IRS ON battery (BAT) light indicate on the
Overhead Maintenance Panel?

Answer 1

IRS operating on backup electrical power (APU hot battery bus)

FCOM, VOL 2; 11.10.11

Question 2

When is full alignment of the IRS required?

Answer 2

When the time from the last full alignment to the next expected
arrival time exceeds 18 hours.

FCOM, VOL 2; 11.20.3

Question 3

What CDU pages are available during Alternate Navigation?

Answer 3

•Alternate navigation LEGS
•Alternate navigation PROGRESS
•Alternate navigation RADIO

FCOM, VOL 2; 11.50.2

Question 4

Can clear air turbulence be sensed by weather radar?

Answer 4

No, turbulence can only be sensed when there is
sufficient precipitation.

FCOM, VOL 2; 11.20.8

Question 5

How many FMCs are provided?

Answer 5

Two FMCs (flight management computers L and R)

FCOM, VOL 2; 11.30.1

Question 6

What factor determines “Econ” speed?

Answer 6

•Cost index

FCOM, VOL 2; 11.31.4

Question 7

What VNAV Pitch mode would you expect at arrow
#3 and arrow #4 with a “climb via” clearance?

Answer 7

•#3 VNAV SPD
•#4 VNAV PTH

FCOM, VOL 2; 11.31.22

Question 8

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?

Answer 8

•VNAV SPD

FCOM, VOL 2; 11.31.29

Question 9

On a -400F Legacy FMC, when does the approach phase of the
FMS start,also know as “on approach logic”?

Answer 9

•When the initial fix of an approach sequences
•When the runway is the active waypoint and
within 25nm

FCOM, VOL 2; 11.31.2

Question 10

NG FMC, “on approach” logic occurs under any of the following conditions?

Answer 10

•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

Question 11

Are there VMCG issues when applying additional thrust manually during
an assumed temperature thrust takeoff?

Answer 11

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

Question 12

What could happen if you advance the thrust levers further then
TO 1 or TO 2 fixed derate following an engine failure?

Answer 12

•Loss of directional control

FCOM, VOL 2; 11.32.3

Question 13

When does the CDU message INSUFFICIENT FUEL display?

Answer 13

•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

Question 14

Can ATC monitor airplane position on the ground when the
transponder is in STBY?

Answer 14

No.

FCOM, VOL 2; 11.20.7

Question 15

Are LNAV and VNAV available in alternate navigation?

Answer 15

No

FCOM, VOL 2; 11.50.1

Question 16

What happens when an active database expires in flight?

Answer 16

•The expired database is used until the active date is
changed after landing.

FCOM, VOL 2; 11.40.7

Question 17

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?

Answer 17

•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

Question 18

What databases are contained in the FMC?

Answer 18

•Aero Engine (AEDB-performance)
•Navigation
•Operational Program Configuration (OPC)
•MAGVAR Tables

FCOM, VOL 2; 11.32.1

Question 19

When will the FMC fail to sequence the active waypoint?

Answer 19

When more than 21 nm from the active route and
not on an offset route.

FCOM, VOL 2; 11.31.3

Question 20

On the 747-8, What modes of operation are available for the MultiScan weather radar?

Answer 20

•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

Question 21

On the 747-8, does the MultiScan weather radar provide turbulence
detection capability?

Answer 21

•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

Question 22

When armed for takeoff, when does VNAV activate?

Answer 22

400 feet

FCOM, VOL 2; 11.31.22

Question 23

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?

Answer 23

•VNAV ALT

FCOM, VOL 2; 11.31.24

Question 24

What VNAV FMA would display on the PFD during departure waypoint altitude constraints?

Answer 24

•VNAV PTH

FCOM, VOL 2; 11.31.23

Question 25

What is the difference between RNP and ACTUAL? And where is it displayed?

Answer 25

•RNP is required navigation performance
•ACTUAL is Actual Aircraft Navigation Performance
•Displayed on FMC POS REF page

FCOM, VOL 2; 11.47.30

Question 26

What is a conditional waypoint?

Answer 26

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