Ch 11 - Navigation

Question 1

ADIRUS switch in OFF removes power under which speed?

Answer 1

Airspeed less than 30 kts

Question 2

Transponder altitude source selector NORM ang ALTN modes?

Answer 2

NORM -> ADIRU alt report source

ALTN -> SAARU alt report source

Question 3

What does the navigation system consist of?

(8)

Answer 3

GPS.
ADIRS (air data inertial reference system),
VOR,
DME,
ILS,
ATC,
WXR
FMS

Question 4

Are the GPS receivers dependent or independent and how are the tuned?

Answer 4

Independent and automatically tuned

Question 5

Which page display the GPS position?

Answer 5

POS REF 3/3

Question 6

What will be the EICAS msg when the FMC use only GPS to navigate?

Answer 6

NAV ADIRU INERTIAL

Question 7

When should GPS updates be inhibited for approach?

Answer 7

When procedure is not referenced to the WGS-84 reference datum

Question 8

What does the ADIRS calculate?

(5)

Answer 8

Altitude

Airspeed

Attitude

HDG

Position

for:
Displays
FMS
Flight Controls
Engine Controls

Question 9

What are the 3 major components of the ADIRS?

Answer 9

Air data inertial reference unit (ADIRU)

Secondary attitude and air data reference unit (SAARU)

Air data modules

Question 10

What does the ADIRU supply?

Answer 10

Primary flight data

Inertial reference and air data

ADIRU is fault tolerant and fully redundant

Question 11

What is fault tolerant and fully rendundant?

Answer 11

The ADIRU

Question 12

What does the ADIRU require to power-up?

Answer 12

Battery bus power and ADIRU ON

Question 13

What will power the ADIRU if the battery switch is turned OFF and electrical power is removed?

Answer 13

The HOT BAT BUS

ON BAT light

Horn in wheel well

Question 14

Will the ADIRU lose power if it is inadvertently switched off in flight?

Answer 14

No, system logic prevents that

Question 15

What is the SAARU and what does it supply information to and when?

Answer 15

Secondary attitude and air data reference unit

Secondary source of critical flight data for

Displays

Flight Control systems

Other systems

Automatically supplies attitude, hdg and air data when the ADIRU fails

Question 16

How many minutes for backup heading does the SAARU have when the ADIRU fails?

Answer 16

3 minutes of backup heading from ADIRU prior to failure

Question 17

Which source is used to set the heading in the SAARU mode?

Answer 17

The magnetic compass heading

Question 18

What functions are inoperative when the ADIRU fails?

Answer 18

LNAV/VNAV
TO/GA
LOC
GS
FPA
TRK HOLD/SEL
HDG HOLD/SEL (operative when standby magnetic compass heading is entered)

FMC NAV pgs
FMC Perf. predictions
ND wind arrow

Flap Maneuver Speeds
PFD Heading (operative when standby magnetic compass heading is entered)

Question 19

What does the ND map display reference in case of ADIRU failure?

Answer 19

TRK

Question 20

Will you have autobrakes when ADIRU fails?

Answer 20

No

Question 21

Are there any SAARU controls?

Answer 21

No, powers up automatically at airplane power-up

Question 22

Does the ADIRU and SAARU have the same air data sources?

Answer 22

Yes, the both receive air data from the same 3 sources

Left, Center, Right Pitot Static systems

Question 23

What air data source does the ADIRU + SAARU use?

Answer 23

L, C, R Pitot Static systems

Question 24

When is air data valid in the ADIRU and SAARU

Answer 24

When 2 or more sources agree in the ADIRU, SAARU or both

Question 25

What is single channel operation in terms of ADIRU and SAARU?

Answer 25

ADIRU and SAARU air data are invalid Left PFD displays ADIRU air data from left PTSS Right PFD displays SAARU air data from right PTSS EICAS -> AIR DATA SYS

Question 26

What does EICAS msg AIR DATA SYS mean?

Answer 26

Single channel operation occurs for ADIRU and SAARU

Question 27

What are the air data modules?

Answer 27

Remote sensors for the air data functions within the ADIRU and SAARU They measure static and pitot pressure. Both ADIRU and SAARU receive data from all air data modules

Question 28

What air data modules does the ADIRU and SAARU receive data from respectively?

Answer 28

They both receive data from all air data modules

Question 29

Apart from PTSS where does the ADIRU and SAARU also receive data from?

Answer 29

The 2 AOA vanes 1 TAT probe

Question 30

Where does the standby flight instrument display receive data from?

Answer 30

Center pitot and static ports through standby air data modules Altitude, attitude and airspeed is independent of ADIRU and SAARU

Question 31

Does the standby flight instrument display receive data from the ADIRU and SAARU?

Answer 31

No, From the center pitot static ports through the standby air data modules