701D Engine

Question 1

Hot start prevention uses what circuitry?

Answer 1

Np overspeed in the ODV. DEC detects, and sends signal to ODV.

Question 2

Aero-thermal improvements from 700 to 701C achieve how big of an increase of max PWR?

Answer 2

20% power

Question 3

Aero-thermal improvements from 701C to 701D achieve how big of an increase of max PWR?

Answer 3

5% power

Question 4

GE develops things to engines. What?

Answer 4

N5 material, sexy metals. TBC, thermal barrier coating. Heat resistance. Improved cooling.

Question 5

How is the DEC cooled?

Answer 5

Airflow through the scroll case.

Question 6

What are the two power sources to the 701D engine?

Answer 6

Primary: Engine Alternator. Secondary: 400hz, 120Vac airframe power.

Question 7

How are DEC codes shown?

Answer 7

Displayed 4 sec, 2 seconds off, repeat.

Question 8

Hotstart prevention. What does the DEC look for?

Answer 8

TGT ≥ 900C
Np ≤ 50%
Ng ≤ 60%

Question 9

Override HSP how?

Answer 9

Press and hold Np overspeed test button during start, and hold it until Ng is above 60%

Question 10

Hot start prevention uses what power?

Answer 10

Airframe power, since Ng is not operative yet.

Question 11

TGT limiting. Dual engine?

Answer 11

879+/-9C

Question 12

TGT limiting. Cintingency power?

Answer 12

903+/-10C

Question 13

Red cable is?

Answer 13

IVHMS

Question 14

How many major component changes on 701D?

Answer 14

11 component changes

Question 15

Tell me about the upturned exhaust.

Answer 15

Must be accounted for in PPC, it has no moving parts, and its function is to decrease IR signature.

Question 16

During eng start, check TGT below how much, before advancing to idle?

Answer 16

30C