Engine

Question 1

What kind of engines does the T38 have?

Answer 1

J85-GE-5R/S
8 stage axial flow turbojet

Question 2

How much thrust per engine?

Answer 2

2200lb at MIL
3300lb at MAX

Question 3

How much thrust is available at 95% RPM?

Answer 3

50%

Question 4

When does max continuous thrust occur?

Answer 4

98% RPM

Question 5

How does the engine start?

Answer 5

Low pressure air is supplied for compressor motoring

Question 6

How is the engine start powered?

Answer 6

Ignition relay - DC power
Igniter firing - AC power

Question 7

How long does the static inverter activate when you press the start button?

Answer 7

30 sec

Question 8

What happens when the throttle is set to idle or above on engine start?

Answer 8

The ignition exciter is energized, firing main and AB igniters and allows fuel to flow to the engine

Question 9

Can you hold the start button to keep the igniters energized?

Answer 9

Yes

Question 10

How can the fuel shutoff to the engine?

Answer 10

Throttles - mechanically
Fuel shut off - electrically

Question 11

Should Idle to mil in less than 1 second be avoided?

Answer 11

Yes, to avoid blade fails

Question 12

MIL to MAX gives a what percent increase in thrust and a what percent increase in Fuel Flow?

Answer 12

50%, 300%

Question 13

Above what altitude should you avoid rapid throttle movement?

Answer 13

Above FL350

Question 14

Nozzle position may indicate less than what percent in AB with less than MAX selected?

Answer 14

50%

Question 15

What powers the EED?

Answer 15

Right DC

Question 16

What does FAIL mean on the EED?

Answer 16

Internal failure, use M key to switch modes and possibly use RCP/FCP

Question 17

What does OFF mean on the EED?

Answer 17

No senor signal

Question 18

When does the EED notify the MDP about EGT?

Answer 18

When EGT is 655-665 for 60 sec

Question 19

What happens when the EED overtemps?

Answer 19

display goes down by 50% and EED HOT is displayed for 1 min and the back lights turn off

Question 20

How does the EED power up on battery power?

Answer 20

Max day brightness regardless of the setting

Question 21

What happens above FL280 and less than 0.6 Mach?

Answer 21

increased stall susceptibility to stall/flameout due to distorted ram air inflow to engine with lower air density

Question 22

When does EGT Droop occur?

Answer 22

At low altitude and high airspeed (500 KCAS), EGT may be lower because of the high air flow rate at MIL with less than 3% nozzle indication

Question 23

When does Idle Decay occur?

Answer 23

During 1 G stalls at or above FL200 with throttles at idle and airspeed less than 200 KCAS the RPM may drop below 46-50% and GEN caution lights illuminate. The engine will not accelerate when throttle is increased.

Question 24

What RPM should you stay above when flying above FL200 and below 200 KCAS?

Answer 24

80%