B7373NG Flight Management and Navigation

Question 1

Can the FMS automatically tune the navigation radios and determine LNAV
courses.

Answer 1

Yes?

Question 2

How many FMC’s are fitted?

Answer 2

Two

Question 3

Can both pilots enter data into their respective CDU’s at the same time?

Answer 3

Simultaneous entries should be avoided.

Question 4

When selecting ECON for cruise, what is this based off?

Answer 4

Cost Index

Question 5

How does Cost Index work?

Answer 5

A low cost index reflects high fuel costs and results in a lower cruise speed. LOW CI, LOW TIME. TIME IS MONEY.

Question 6

What is Actual navigation performance (ANP).

Answer 6

The FMC is 95% certain that the airplane’s actual position lies within a circle with a radius of the ANP value around the FMC position. The lower
the ANP value, the more confident the FMC is of its position estimate.

Question 7

What is Vertical Actual Navigation Performance (VANP)

Answer 7

The FMC is 99.7% certain that the airplane’s actual altitude lies within a
vertical band equal to plus or minus the ANP value. The lower the VANP value,
the more confident the FMC is of its altitude estimate.

Question 8

What does ‘UNABLE REQD NAV PERF–RNP’

message displayed on the CDU indicate?

Answer 8

ANP exceeds the displayed RNP value.

Question 9

What will happen the UNABLE REQD NAV PERF–RNP message is displayed on the CDU scratchpad after the designated time

Answer 9

An additional amber UNABLE REQD NAV PERF–RNP will be displayed on the MAP. The amber FMC lights located on the forward instrument panel will also illuminate with the annunciation of this message.

Question 10

What default value does the FMC use for VRNP) during oceanic, en route, and terminal phases of flight?

Answer 10

400ft

Question 11

When can LNAV be activated?

Answer 11

Within 3NM of the track, outside of
3NM, LNAV engages if on an intercept heading of 90 degrees or less and the intercept will occur before the active waypoint.

Question 12

What is the VNAV Descent path calculated off?

Answer 12

• idle thrust
• speedbrakes retracted
• descent wind speed
  -decreasing with decreasing
  altitude
  -applicable target speed.

Question 13

How does VNAV try an prevent an OVERSPEED after passing T/D point?

Answer 13

If target speed reaches within approximately 6 knots of Vmo/Mmo), VNAV may revert to LVL CHG to prevent overspeed.

Question 14

What is CDU message DRAG REQUIRED and indication of?

Answer 14

Unexpected increases in tailwind which results in a waypoint speed constraint greater than 10 knots above the predicted speed increase in airspeed to maintain path.

Question 15

When does TO/GA become available during descend phase?

Answer 15

After descending below 2000’ RA

Question 16

If using DES NOW (VNAV PTH) function, what ROD will the aircraft try and descend at?

Answer 16

1000fpm until intercepting original descent path.

Question 17

What will cause the FMC transitions out of “on approach” mode?

Answer 17

• selecting TO/GA
• the airplane lands
• the waypoint cycles to the first waypoint of the missed approach
• executing a direct-to waypoint in the missed approach.

Question 18

When is selecting a roll mode permissible?

Answer 18

when the airplane climbs above 400 feet radio altitude.

Question 19

What is the purpose of using Reduced Thrust take off and when is it utilised?

Answer 19

To lower EGT and extend engine life. They are used whenever performance limits and noise abatement procedures permit.

Question 20

What is the maximum thrust reduction authorised?

Answer 20

25 percent below any certified rating.

Question 21

When is ATM prohibited?

Answer 21

When conditions exist that affect
braking, such as slush, snow, or ice on the runway, or if potential windshear
conditions exist.

Question 22

When the assumed temperature method is used with full rate, is the reduced thrust
setting is considered a limitation?

Answer 22

No, if conditions are encountered where

additional thrust is desired, the crew can manually apply full thrust.

Question 23

When the assumed temperature method is used with derate, is the reduced thrust
setting is considered a limitation?

Answer 23

Yes, a thrust increase past derated output following an engine failure could result in a loss of directional control while on the ground.

Question 24

How much is the clim thrust derated by when using CLB-1 during climb?

Answer 24

CLB–1 provides a climb limit reduced by 3% N1 (approximately 10% thrust).

Question 25

How much is the clim thrust derated by when using CLB-2 during climb?

Answer 25

CLB–1 provides a climb limit reduced by 6% N1 (approximately 20% thrust).

Question 26

When does climb thrust return to normal if using Derated Thrust Climb?

Answer 26

Approximately FL150.

Question 27

What is the purpose of Derated Climb Thrust?

Answer 27

Derated Climb Thrust reduces engine maintenance costs.

Question 28

Does Derated Climb Thrust increase or decrease total trip fuel?

Answer 28

INCREASES total trip fuel.

Question 29

What does ‘VTK’ displayed on navigation display indicate?

Answer 29

The right or FMC fails depending on which ND it’s displayed on. Left FMC is connected to left ND and right FMC to right ND.

Question 30

What will happen 25-30 seconds after the left FMC fails?

Answer 30

The left navigation display will display failure information.

Question 31

What does the CDU message ‘VERIFY RNP’ indicate?

Answer 31

Underlying RNP value is
less than manually
entered value.

Question 32

What are the most and least important CDU messages?

Answer 32

Alerting messages are most important, followed by entry error messages. Advisory
messages are least important.