AHRS

Question 1

Why does the Defensive Aids Suite (DAS) receive an input from the Attitude and Heading Reference System (AHRS)?

Answer 1

It provides reversionary data in case of Integrated GPS and Inertial navigation system (IGI) failure

Question 2

What AC power is supplied to the Sensor Electronic Unit (SEU) and Magnetic Detector Unit (MDU)?

Answer 2

26 Vac

Question 3

Which Primary Flight Display (PFD) instruments does the Attitude and Heading Reference System (AHRS) feed?

Answer 3

Attitude Indicator (AI), Horizontal Situation Indicator (HSI) and Vertical Speed Indicator (VSI)

Question 4

What prompt appears on the Attitude Indicator (AI) of the affected crew station if a comparison of roll data between the Integrated GPS and Inertial navigation system (IGI) and either Sensor Electronic Unit (SEU) is suspect?

Answer 4

CHECK ROLL

Question 5

After application of power, how much time passes before an Attitude and Heading Reference System (AHRS) automatic initialisation and alignment phase begins?

Answer 5

5 seconds

Question 6

How long does it take the Sensor Electronic Unit (SEU) to ground align?

Answer 6

Up to 30 seconds

Question 7

How should the aircraft be flown when “ALIGNING” is displayed in yellow adjacent to the digital heading readout on the Primary Flight Display (PFD)?

Answer 7

Straight and level for 20 seconds

Question 8

From which equipment is the attitude information being provided to the pilot’s Primary Flight Display (PFD) if the “XFR” in yellow is displayed on the attitude indicator?

Answer 8

Data from the Integrated GPS INS (IGI)