Flight Management and Navigation

Question 1

How/when does the FMC receive DME updating?

Answer 1

DME updating is defaulted to OFF and must be manually selected on the FMC NAV OPTIONS page

Question 2

When the tunes frequency (no decoded name) remains visible on the PFD or ND, or shows an incorrect identifier, how do you verify the station identity?

Answer 2

Audio morse code

Question 3

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

Answer 3

When there is no present position entry, or

There is a significant difference between the entered position and the previously known position

Question 4

What does the FAULT light (amber) on the IRS mode selector unit indicate?

Answer 4

A system fault affecting the related IRS ATT and/or NAV modes has been detected

Question 5

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

Answer 5

Loss of AC power to the Associated IRS and it is now operating on DC power from the switched hot battery bus

Question 6

What will happen if both ON DC lights (amber) illuminate?

Answer 6

Right IRS will turn off after 5 minutes

Question 7

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

Answer 7

Problem with the DC power supply for the associated IRS

If all other lights are extinguished, the IRS is operating normally on AC power

Question 8

When is INSUFFICIENT FUEL on the CDU displayed?

Answer 8

Less than 2,000lbs of fuel estimated at destination

Question 9

What are the indications of a left, right, or dual FMC failure?

Answer 9

VTK on the respective ND. For additional symptoms reference the QRH.

Question 10

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

Answer 10

EOSID

Question 11

IRS ground alignment at high latitude may take how long?

Answer 11

Up to 17 minutes

Question 12

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

Answer 12

A single GPS failure

Question 13

With the FMC source select switch set to NORMAL, how are the FMCs controlling the CDUs and providing input to the autothrottle?

Answer 13

Left FMC is controlling the MCDUs and the Autothrottle

Question 14

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

Answer 14

Both LNAV and VNAV will disengage [but can be reengaged]

Question 15

What does an illuminated MCDU EXEC light indicate?

Answer 15

Active data has been modified but not yet executed

Question 16

What signifies mandatory data inputs on the MCDU?

Answer 16

Empty boxes

Question 17

When does LNAV engage, regardless of heading?

Answer 17

Within 3.0nm XTK of the course

Question 18

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

Answer 18

ANP - FMC’s estimate of the quality of its’ position, estimates the maximum position error with 95% probability

RNP - Minimum required performance for segment of flight

ANP should not exceed RNP

Question 19

What assumptions are made to calculate the descent path?

Answer 19

Idle thrust, and
Descent winds, and
Speedbrakes retracted, and
Target descent speed maintained

Question 20

When does VNAV PTH revert to VNAV SPD?

Answer 20

Deviate more than 200’ above the path, or
Near overspeed, or
LNAV path ends [no TO waypoint]

Question 21

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

Answer 21

BYPASS appears when the next leg is too short to intercept and laterally capture the leg

Question 22

When using the IRS transfer switch, what amber caution appears? Is there a checklist for it?

Answer 22

INSTR SWITCH appears in amber on the PFD

There is NO checklist