Engine Parameter Sensing

Question 1

Where are the Np sensors located?

Answer 1

On the top of the exhaust frame

Question 2

How many Np sensors are there?

Answer 2

2

Question 3

How is Np sensed?

Answer 3

Power turbine has two sets of teeth that induce electrical pulses to the sensor.

These teeth measure the twist of the shaft proportional to TRQ, and creates a pulse every time the tooth passes a reference point

Question 4

Are the Np sensors interchangeable?

Answer 4

Yes

Question 5

What does the left Np sensor provide?

Answer 5

Np to EDECU and VIDS

Question 6

What does the right Np sensor provide?

Answer 6

Feeds TRQ computation circuit and Np Overspeed protection system

Question 7

What supplies the Ng signal?

Answer 7

Alternator

Question 8

How many TGT thermocouples are there?

Answer 8

7

Question 9

How is TGT sensed?

Answer 9

Thermocouples provide an average output to the EDECU

Question 10

What is the TGT bias?

Answer 10

-71 C by the EDECU

Question 11

What happens if the EDECU is not powered by the alternator or 400Hz Airframe power?

Answer 11

TGT will read 71 C higher than normal