Navigation/Wx Radar

Question 1

The Left IRU is normally powered by:

The Right IRU is normally powered by:

Answer 1

AC Standby Bus

AC Transfer Bus 2

Question 2

If AC power is lost to the IRUs, the Left IRU is powered by what system?

Answer 2

AC STBY BUS through the SWITCHED HOT BAT BUS

Question 3

Backup DC power to the right IRS is automatically terminated if normal AC power is not restored within ____ mins

Answer 3

5

Question 4

How will the crew be alerted that an IRS is running on DC power?

Answer 4

The ON DC light will illuminate and the ground crew call horn in the nose wheel well sounds (A/c on ground only)

Question 5

What does the DC FAIL light mean?

Answer 5

The respective DC power is not normal

Question 6

When the IRS Mode Selector is turned OFF, the IRS remains powered for approximately ____ seconds.

How will the crew know when the system is shut down?

Answer 6

30 seconds

The ALIGN light will extinguish

Question 7

What does a flashing ALIGN light mean during alignment process?

What should you do if you see this?

Answer 7

No present position has been entered

The entered position is unreasonable and does not pass the internal position comparison test

Excessive motion of the aircraft during the alignment period
…
Ensure present position has been entered

Question 8

When doing a fast alignment on a through flight, the IRS position must be entered within ____ seconds to realign the IRSs and zero out the ground speed

Answer 8

30 seconds

Question 9

How is the crew alerted to a loss of alignment due to aircraft motion during alignment?

Answer 9

The FAULT light illuminates seadily and the ALIGN light flashes

Question 10

If alignment is lost while airborne, can the alignment be regained in flight?

Answer 10

No

Question 11

Explain the use of the ATT option on the IRS selector knob

Answer 11

Allows the crew to re-level the system and provide attitude reference. If IRS information is lost, the crew can select ATT to receive attitude information.

This switch requires approximately 30 seconds of straight and level, un-accelerated flight to complete leveling.

Question 12

When will the amber GPS light illuminate?

Answer 12

When both GPS sensor units have failed, or during Master Caution Recall if a single GPS sensor has failed

Question 13

When is the DRAG REQUIRED message shown?

Answer 13

If the airspeed is ten knots or more above the FMC target speed

Question 14

On the weather radar the Turbulence function is only effective to what range selection? What happens beyond this distance?

Answer 14

40 nm range selection

Anything beyond 40 nm is just weather display

Question 15

Radar returns are not displayed beyond ____ NM when ____ NM is selected on the EFIS control panel

Answer 15

320 NM when 640 NM is selected

Question 16

The weather radar automatically begins scanning for windshear when:

Answer 16

The thrust levers are advanced for takeoff

In flight below 2,300 ft RA

Question 17

Predictive windshear alerts are only issued when the aircraft is below ____ ft RA

Answer 17

1,200

Question 18

Predictive windshear CAUTION is indicated by what?

Answer 18

Aural alert “MONITOR RADAR DISPLAY”

An amber message and red windshear symbol appear on the ND

Question 19

Predictive windshear WARNING is indicated by what?

Answer 19

A red message and windshear symbol on the ND

A red WINDSHEAR indication on both PFDs

Aural alert “WINDSHEAR AHEAD” (during takeoff)

Aural alert “GO AROUND, WINDSHEAR AHEAD” (during approach)