Flight Management / Navigation

Question 1

How/when does the FMC receive DME updating?

Answer 1

Defaulted to OFF and must be manually selected on the FMC NAV OPTIONS page. / uses two different DMEs to determine location.

Question 2

What does a flashing ALIGN light (white) on the IRS panel during preflight indicate?

Answer 2

Alignment cannot be completed due to IRS detection of significant difference between previous and entered positions or an unreasonable present position entry or no present position entry.

Question 3

What does the FAULT light (amber) on the IRS Mode Selector Unit indicate?

Answer 3

System fault affecting the related IRS ATT and/or NAV modes has been detected.

Question 4

What does an ON DC light (amber) illuminated in flight indicate?

Answer 4

Operating on DC power from the Switched Hot Battery Bus (AC power not normal).

Question 5

What does a single DC FAIL light (amber) illuminated in flight indicate?

Answer 5

Indicates that DC power for the related IRS is not normal.

Question 6

IRS ground alignment at high latitudes may take how long?

Answer 6

Up to 17 minutes.

Question 7

When does IRS position and ground speed information become available?

Answer 7

When the IRS is aligned on the ground.

Question 8

What does a GPS light (amber), illuminating during Master Caution Recall and extinguishing when the Master Caution System is reset, indicate?

Answer 8

Failure of a single GPS sensor.

Question 9

With the FMC Source Select Switch set to NORMAL, how are the FMCs controlling the CDUs and providing input to the autothrottle.

Answer 9

Left FMC is primary and controls the CDUs and Autothrottle.

Question 10

How does moving the FMC source select switch to BOTH ON L or R affect LNAV and VNAV?

Answer 10

Will disengage both LNAV or VNAV.

Question 11

What does an illuminated MCDU EXEC light indicate?

Answer 11

Indicate that active data has been modified, but not executed.

Question 12

What signifies mandatory data inputs on the MCDU?

Answer 12

Open boxes.

Question 13

When is INSUFFICIENT FUEL on the CDU displayed?

Answer 13

Predicted fuel at destination will be 2000 lbs (900 kg) or less.

Question 14

What are the indications of a right FMC failure?

Answer 14

The message SINGLE FMC OPERATION will be displayed in both scratchpads. VTK will display on the right navigation display.

Question 15

What are the indications of a left FMC failure?

Answer 15

MENU page will appear on both CDUs. VTK will appear on the left navigation display.

Question 16

What are the indications of a dual FMC failure?

Answer 16

The MENU page will appear on both CDUs & VTK will appear on both navigation displays.

Question 17

Define Actual Navigation Performance (ANP) and Required Navigation Performance (RNP)

Answer 17

Actual navigation performance (ANP) is the FMC’s estimate of the quality of its position determination.

RNP is the required performance depending on the environment.

Question 18

When does LNAV engage, regardless of heading?

Answer 18

Within 3 nm of the route leg.

Question 19

The descent path starts at the calculated top of descent (T/D) point and includes waypoint altitude restrictions. The path is based on what parameters?

Answer 19

Descent path calculation projects upward from the end of descent (E/D) point to the cruise altitude. The FMC calculates a descent path based on airspeed restrictions, altitude restrictions and the E/D point.

Question 20

When does VNAV PTH descent automatically revert to VNAV SPD?

Answer 20

Limit Speed Reversion, Path Diversion or No “TO” Waypoint.

Question 21

AT28R, BT28R, and CT28R are waypoints from what type of FMC procedure?

Answer 21

EO SID waypoints.

Question 22

When will BYPASS appear between two waypoints on the legs page?

Answer 22

If it is impossible for the aircraft to turn and capture a leg between two waypoints a bypass will be created.