Powerplant: General Flashcards Preview

Lear 45/40XR Initial Training > Powerplant: General > Flashcards

Flashcards in Powerplant: General Deck (14):
1

What is the brand of this engine?

- TFE 731-20AR or 20BR

2

Thrust output of these engines?

- 3,500lbs. of max thrust
- 3,650lbs. of thrust with APR

3

Basic description of this aircraft?

- Lightweight
- Two-spool (Hybrid Axial/Centrifugal)
- Hi-Bypass ratio (3:1)
- DEEC

4

Describe N1 spool

- 4-stage (LP) axial-compressor connected on a common shaft to 3 (LP) axial-turbines

5

Describe N2 spool

- 1 (HP) Centrifugal Impeller connected on a common shaft to a single stage (HP) turbine

6

Overspeed protections?

- 107% N1
- 109% N2
Only in ENG CMPTr (ON) (MAN) Mode

7

What is a tower shaft?

- A shaft in between the last stage of the (LP) compressor and (HP) Impeller
- Its purpose is to drive the accessory gear box

8

What is a planetary gearbox?

- It is to reduce the speed of the (LP) common shaft for the fan

9

How many fuel nozzles per engine?

- 12

10

How many ignitors plugs per engine?

- 2

11

What is mounted on the accessory gearbox?

- 1. Fuel Pumps (HP/LP)
- 2. Oil Pump
- 3. Fuel Control Unit (FCU)
- 4. DC Starter/Generator
- 5. AC Alternator
- 6. Hydraulic Pump
- 7. Motive Flow Fuel Pump

12

Engine start sequence

- 1. Start button engages DEEC to activate starter
- 2. IGN on - 6.8% N2
- 3. Fuel - Positive N1
- 4. ITT within 10 seconds
- 5. OIL Press with 10 seconds of light-off
- 6. IGN off - 45% N2
- 7. START OFF - 50% N2
- 2N1/3TT/5N2/150 FF
- Generator online - 95% N1 ground idle

13

When will APR automatically come on?

- 15% differential thrust of N2

14

What does DEEC provide?

- 1. Thrust Management
- 2. Rating display - N1 bug reference
- 3. Engine overspeed protection
- 4. Automatic start sequence
- 5. Spool speed and temperature limiting
- 6. Surge-free acceleration and deceleration
- 7. Engine synchronization
- 8. APR