Systems NAVIGATION

Question 1

What occurs when the IRS enters Stationary Alignment mode

Answer 1

Aircraft speed < 30 kt
-aligns with local vertical
-estimates current latitude
-finds true north
-counts down the remaining time to NAV mode
approx 5-10 minutes
FCOM 1 16-02-6

Question 2

What is Align In Motion AIM mode

Answer 2

When Aircraft speed is > 30 kts
IRU’s recover full navigation capability if there is an in-flight power interruption
Dynamic conditions 15-25 mins
FCOM 1 16-02-8-10

Question 3

Where is GNSS information displayed

Answer 3

FMS POS GNSS tab
FCOM 1 16-03-5

Question 4

TCAS modes can be selected by

Answer 4

CTP or CNS
FCOM 1 16-04-2

Question 5

What colour does the TAWS display show terrain as 500 ft below to 2000 ft above

Answer 5

Yellow
FCOM 1 16-05-8

Question 6

List the functions available in weather radar AUTO mode

Answer 6

-Multiscan
-Ground Clutter Suppression
-Overflight Protection
-Path Attenuation Correction
-Temp based/Geographic based gain
FCOM 1 16-06-6

Question 7

When below a predetermined level how much Ground Clutter is removed

Answer 7

98%
FCOM 1 16-06-7

Question 8

Describe the Path Attenuation Correction (PAC) of the WXR system

Answer 8

It shows an amber arc up to 80 nm ahead
Identifies potentially dangerous precipitation ahead
Only active in AUTO Mode
FCOM 1 16-06-13

Question 9

When does Overflight Protection become active

Answer 9

Above FL220
within 15nm radar stores and displays intense returns so they remain in view until behind aircraft
FCOM 1 16-06-10 16-06-24

Question 10

How many IRU’s are installed

Answer 10

3
Each receives data from GNSS and Air Data Computers
They are powered by multiple sources
FCOM 1 16-02-1

Question 11

At what distance does the NAV to NAV preview function display

Answer 11

Within 31 nm of the destination airport
FCOM 1 16-01-11

Question 12

How many GPS receivers are fitted to the A220

Answer 12

2
FCOM 1 16-03-1

Question 13

How many satellites are required for a 3D solution

Answer 13

4
FCOM 1 16-03-1

Question 14

What does ‘Proximate Traffic’ indicate on the ND

Answer 14

Traffic within 6 nm horizontal and 1200 ft vertical
Non threatening, no aural alert
FCOM 1 16-04-19

Question 15

Describe how to manually tune a VOR frequency using the CTP and set the course function and VOR needles

Answer 15

MAN tune FRQ in CTP
Select NAV SRC NAV 1/2
Set course on main page of CTP
(each CTP independent)
CTP select BRG 1/2
FCOM 1 16-01-18/21/29

Question 16

What considerations with respect to NAV display indications are there following a TCAS or TAWS warning

Answer 16

During a TAWS or TCAS alert WXR is removed
TAWS automatic restoration
TCAS WXR must be reselected
Confirm WXR radar display is ON using CTP or OVLY on the ND
WXR is removed with first TA
FCOM 1 16-06-26