Chapter 16, 17, 18

Question 1

Name the four communications systems backup and failure modes.

Answer 1

1. Single mission computer fail
2. 1553 data bus failure
3. AMC or OCP failure
4. Battery mode

Question 2

Comm Sys Backup and Failure Modes: explain the impact of a single mission computer failure

Answer 2

no impact to ICS or radios

AMC (audio management computer) is operational

Question 3

Comm Sys Backup and Failure Modes: explain the impact of a 1553 data bus failure

Answer 3

AMC is operating but both mission computers lose power or comm is lost between computers and 1553 data bus

no impact to ICS, radios tuned via RCU, can be selected via OCP or RCU. clear/secure, DF, and RELAY not available on OCP

Question 4

Comm Sys Backup and Failure Modes: explain the impact of an AMC or OCP failure

Answer 4

RAD 1 hardwired to pilot station
RAD 2 hardwired to copilot station

controlled only via RCU, PTT only

Question 5

Comm Sys Backup and Failure Modes: explain the impact of the battery mode

Answer 5

only RAD 1 is available and hardwired to the pilot station

controlled via RCU, PTT only

Question 6

What is INS?

Answer 6

INS is worldwide, passive and self-contained.

Precisely determines: attitude, heading, acceleration, velocity, and position

Question 7

What is the disadvantage of INS?

Answer 7

information provided is precisely accurate for a short time

Question 8

What is the disadvantage of GPS?

Answer 8

not self-contained (relies on satellites), vulnerable to jamming and spoofing

Question 9

What is GPS? What does it provide?

Answer 9

GPS is worldwide and passive.

GPS is employed to provide very precise and regular position, velocity, and time updates to INS to preclude navigation errors.

Question 10

Define SAASM. What does it provide?

Answer 10

full selective availability / anti-spoofing capability

our EGIs have SAASM have direct Y-code acquisition meaning they can directly tract the encrypted military P(Y) code without first acquiring the civilian code, significantly increasing resistance to jamming

Question 11

Valid heading and velocity data from which EGI is required for coupled approach and hover function?

Answer 11

EGI 2

Question 12

How many satellites are required for an HNAV alignment?

Answer 12

4

Question 13

A normally functioning EGI will display what EHE and FOM?

Answer 13

FOMs of 2 or less and EHE of < 25’

Question 14

Define RAIM. What does it provide?

Answer 14

receiver autonomous integrity monitoring

compares data from all visible satellites and tags suspect information

Question 15

EGIs are capable of tracking how many satellites simultaneously?

Answer 15

24

Question 16

How do you execute a cycloid? How accurate are the results?

Answer 16

a 360 deg. to 390* turn at a steady bank angle and airspeed

expected performance within 2 knots and under 5 deg from actual wind

Question 17

List the TA array state for each symbol

Answer 17

folded
unfolded
in transition

last known state - folded
last known state - unfolded
last known state - in transition

invalid TA array data

Question 18

What is a soft INIT?

Answer 18

a soft INIT is defined as initializing a device on the DIAG page by selecting INIT from the pop-up menu

Question 19

What is a hard INIT?

Answer 19

a hard INIT is defined as initializing a device by pulling the circuit breaker, waiting 20 seconds, resetting the CB, and then performing a soft INIT