NAV Systems

Question 1

What do the angular accelerometers measure?

Answer 1

Degree of roll and rate of change

How the aircraft twists in space

Question 2

Where is the ARN-153 TACAN R/T located?

Answer 2

Underneath the companionway

Question 3

How many antennas are associated with the ARN-147 VOR/ILS/MB system?

Answer 3

3

Question 4

How many channels does the ARN-153 TACAN have?

Answer 4

252 (126-x and 126-y)

Question 5

What are SA/AS codes?

Answer 5

Selective availability and anti spoofing

Question 6

How would you select the SA/AS codes for use on the GPS?

Answer 6

Changing “MIXED” to “ALL Y”

Question 7

Where is the ARN-153 TACAN R/T antenna located?

Answer 7

Underside of the aircraft AFT and right of the boomerang (VOR/ILS) antenna

Question 8

Where is the ARN-149 ADF antenna located?

Answer 8

Underside of the aircraft, centered, STA 190

Question 9

Where are the EGIs located?

Answer 9

Bottom of the avionics closet

Question 10

What information is provided by the EGIs?

4 things

Answer 10

Heading, velocity, position, and estimate error

Question 11

How many linear and angular accelerometers are associated with each Inertial Navigation System?

Answer 11

-3 angular and 3 linear

Question 12

How many navigation solutions are provided by each EGI?

Answer 12

3

• INS
• GPS
• Blended

Question 13

What information does the TACAN radio provide?

5 things

Answer 13

• slant range distance
• relative bearing
• course deviation
• to/from
• audio identification information

Question 14

What is the operating range to an air-to-ground TACAN station for the TACAN radio?

Answer 14

390NM

Question 15

What is the operating range for an air-to-air TACAN station for the TACAN radio

Answer 15

200NM

Question 16

Name 4 benefits of using a Ring Laser Gyro for the INU system.

Answer 16

• virtually indestructible
• no moving parts
• doesn’t rely on external sources for information
• immune to jamming/deception

Question 17

What are the four modes the TACAN can operate in?

Answer 17

R, TR, AAR, AATR

Question 18

The DH (decision height) field value on the VOR/ILS Control page is in MSL or AGL?

Answer 18

MSL

Question 19

What are the three alignment modes that can be selected to initialize the inertial navigation units (INUs)?

Answer 19

GC ALN
SH ALN
SHIP

Question 20

What four items of information are available on the RUNWAY DATA page on the CDU?

Answer 20

• RWY Designation
• RWY length and width
• RWY TDZE

Question 21

How many ADF Presets are available?

Answer 21

6