Navigation System

Question 1

(T/F) The flight crew must select and enter what mode they would like for the Inertial Reference Units (IRUs)

Answer 1

False. It is automatic

Question 2

A stationary alignment of the IRU takes between ___ and ___ minutes

Answer 2

5 to 17 minutes

Question 3

An Alignment In Motion (AIM) for the IRU takes between ___ and ___ minutes

Answer 3

15 to 30 minutes

Question 4

IRS X ALIGNMENT in ____ on EICAS means what?

Answer 4

Blue. Means an Alignment In Motion (AIM) is being conducted

Question 5

(T/F) The IRU’s receive primary and secondary power from two different sources, thus if one loses power the other will continue to run.

Answer 5

True

Question 6

Pushing the IRS button on the reversionary panel does what?

Answer 6

Flight Director (FD) disengages
Autopilot (AP) disengages
The annunciation on the PFD changes to IRS 1 or IRS 2 accordingly

Note… The AP and FD can be reengaged once the system switches IRS

Question 7

(T/F) All GPS fault messages will go through the EICAS

Answer 7

False. All GPS fault messages will go through the MCDU

Question 8

GPS RAIM ABOVE LIMIT on the MCDU means what?

Answer 8

The GPS has lost integrity

Question 9

RAIM WILL EXCEED LIMIT on the MCDU means what?

Answer 9

The GPS integrity exceeds the limit

Question 10

GPS RAIM UNAVAILABLE on the MCDU means what?

Answer 10

RAIM is not available

Question 11

A mode __ transponder is installed in the aircraft

Answer 11

Mode S

Question 12

The transponder automatically switches to on-ground mode after the aircraft touches down and is below ___ kts

Answer 12

50 kts

Question 13

(T/F) Should the weather radar lose its primary power source it will automatically switch to its backup source

Answer 13

False. There is no backup power supply for the weather radar. Should the primary power source fail, the weather radar is failed

Question 14

(T/F) The weather radar can only be in one mode for the entire crew. I.e. The captain can’t be in GMAP mode while the FO is in WX mode.

Answer 14

False. They can be in different modes

Question 15

The turbulence mode in the weather radar can only be selected in the ___ mode and with a range of ___ nm or less

Answer 15

WX mode with ranges of 50 nm or less

Question 16

The TGT mode on the weather radar does what?

Answer 16

Alerts for any possible red or magenta weather in your flight path, but outside visible range. The TGT will turn from green to amber if this is detected. If this happens you should zoom out your range

Question 17

The normal radar sweep is +/- ___ deg. from the aircraft nose at a rate of ___ sweeps per minute.

Selecting the SECT button reduces the angle of the sweep to +/- 30 deg. and increases the sweep rate to ___ sweeps per minute

Answer 17

Normal is 60 deg. with 12 sweeps per minute

SECT mode is 30 deg. with 24 sweeps per minute

Question 18

Radar tilt can be changed by _____,and has a range of ___ deg. up and ____ deg. down.

Answer 18

The inner knob on the CCD when in calibrated gain.

15 deg. up and 15 deg. down

Question 19

The Altitude Compensated Tilt (ACT) button does what?

Answer 19

Adjusts tilt based on altitude and range to automatically select the best tilt angle. The tilt knob can still be used to change the tilt by up to 2 deg.

Question 20

The Raid Echo Attenuation Compensation Technique (RCT) function does what?

Answer 20

The RCT function permits the radar receiver to automatically adjust sensitivity to compensate for attenuation losses as the radar pulse passes through weather targets on its way to illuminate other targets

Question 21

Cyan cones on the weather radar means what?

Answer 21

Any weather in the cyan is not shown due to radar attenuation. This area should be avoided and considered severe weather