Navigation

Question 1

What is shown on ND when EFIS control panel POS push button is pushed?

Answer 1

Displays left and right GPS positions on the ND.

Question 2

How is ADIRU alignment affected by aircraft movement?

Answer 2

Aircraft must be parked

Alignment stops if an ADIRU detects motion during alignment. Then continues and completes 10 minutes after motion stops.

Present position (Lat and Long) must be entered on the CDU POS INIT page to complete alignment.

Question 3

When must a full alignment be accomplished and how?

Answer 3

Must be accomplished when the time from the last full alignment to the next expected arrival time exceeds 18 hours.

Rotate IRS mode selector to off and then back to NAV.

Question 4

How is a 30 second fast align accomplished?

Answer 4

Positioning selectors to align, entering present position and repositioning selectors to NAV.

Question 5

Can all 3 IRU’s operate using D.C.? Any time limit?

Answer 5

L/R ADIRU can operate on D.C. power continuously.

C ADIRU operates on DC power for 5 minutes and then shuts down.

Question 6

What is the list of DME stations on POS REF page 2 used for?

Answer 6

Displays the identifiers of the DME stations used for FMC position updates.

Question 7

When will the ILS receivers tune automatically?

Answer 7

• ILS, LOC, Back course, LDA, or SDF approach has been selected to the active route, and
• The airplane is within 150nm of the destination airport, 50nm of T/D, or in FMC descent.

Question 8

When is ILS frequency change inhibited?

Answer 8

1. On initial takeoff, inhibited for 10 minutes to prevent clutter on PFD.
2. A/P engaged and LOC or G/S captured.
3. FD ON and LOC or G/S captured and aircraft below 50 feet RA.
4. On ground, LOC alive, aircraft heading within 45 degrees LOC course, ground speed more than 40KT.

Question 9

Which radio can be tuned using Centre CDU after the failure of both FMC’s?

Answer 9

Both ILS and GLS receiver.

Question 10

Describe GLS tuning method.

Answer 10

Manually on NAV RAD page by entering valid GLS channel between 20,000-39,999 or auto tuned.

Question 11

Which ND mode can display weather radar return?

Answer 11

All except PLAN, VOR Centre, APP Centre.

Question 12

Where is the weather radar status displayed (operating mode and fault condition)?

Answer 12

ND

Question 13

Which weather radar setting is available during multiscan weather radar operation (tilt and gain)?

Answer 13

Auto- can only adjust gain and only shows you significant weather.

Manual- can adjust both tilt and gain.

Question 14

Can CAT be sensed by the weather radar?

Answer 14

No

Question 15

When will the FMC sequence an active waypoint?

Answer 15

Will NOT sequence an active waypoint when more than 21nm off the active route and not on an offset course.

Question 16

Describe FMC position and the radio position updates.

Answer 16

Calculated from ADIRU inertial position updates using GPS and Nav radios.
When receiving reliable GPS data, the primary mode of navigation uses a GPS updated FMC position.
If GPS not available, FMC position updates using navigation radios.

Question 17

Is other DME position update available if both VOR’s are manually tuned?

Answer 17

Manually selecting VOR frequencies or identifiers precludes the FMC from auto tuning other VOR/DME frequencies for position updating but FMC continues to tune DME-DME pairs for position updating.

Question 18

What are the indications on the CDU’s when the selected FMC fails (Primary)?

Answer 18

EICAS message FMC LEFT, RIGHT displays.

On ground: scratchpad message SINGLE FMC L, R OPERATION.

In flight: scratchpad message SINGLE FMC L, R OPERATION only on one CDU. Scratchpad message TIMEOUT-RESELECT displays on the CDU with the inoperative FMC.

Question 19

Which CDU pages are available in Alternate navigation?

Answer 19

ALTN NAV LEGS, ALTN NAV PROG, ALTN NAV RAD.

Question 20

Describe adding waypoints in alternate navigation.

Answer 20

CDU’s don’t have a performance or Nav database, instead they copy the active route from the FMC.

If new waypoints are to be added in ALTN MODE, they must be entered by latitude and longitude.

Question 21

Describe alternate navigation radio tuning.

Answer 21

Auto tune is not available.

Radios must be manually tuned on each CDU in alternate navigation.

Question 22

Which ND modes can provide TCAS traffic symbols?

Answer 22

MAP (expanded), MAP (Centre), VOR (expanded), APP (expanded)

Question 23

When will TCAS issue an RA?

Answer 23

Aircraft will enter a conflict airspace within approx 20-30 seconds.

No RA below 1000 feet.

Question 24

What is “Proximate Traffic” and when is it displayed?

Answer 24

Another aircraft is neither RA or TA but within 6nm plus 1200 feet vertically.

Question 25

Where and how is vertical guidance displayed for an RA?

Answer 25

When TCAS predicts an RA, TCAS PFD vertical guidance is displayed for a traffic avoidance manoeuvre to ensure vertical separation. - TCAS voice annunciation sounds. - TCAS PFD vertical guidance displayed. - TCAS red message TRAFFIC displayed on ND.

Question 26

Describe obstacle and terrain alert priority.

Answer 26

Obstacle higher priority than terrain.

Question 27

Which system scans and provides predictive wind shear alerts?

Answer 27

Predictive Windshear Alerting System (PWS) in weather radar.

Question 28

When will the weather radar begin scanning for wind shear during take off?

Answer 28

When engine thrust lever 2 or 3 is in takeoff range whether weather radar is selected or not.

Question 29

During landing, when will weather radar begin scanning for windshear?

Answer 29

Weather radar begins scanning for windshear below 2300 Feet RA. PWS alerts enabled below 1200 feet RA.

Question 30

Describe detection for immediate windshear.

Answer 30

Provided when and excessive downdraft or tailwind is occurring during take off, approach, and landing.

Question 31

Describe bank angle alert values.

Answer 31

Voice alert BANK ANGLE sounds if bank angle exceeds 35, 40 and 45 degrees.

Question 32

Which EFIS MINIMUM setting is used for GPWS call?

Answer 32

Captains EFIS control panel.

Question 33

How is specific radio position update inhibited?

Answer 33

NAV RAD, page 2, disable radio update.

Question 34

When will the ground crew call horn sound for the IRS system?

Answer 34

When any IRS selector is left on and lost AC power.