Powerplant: General Flashcards
1
Q
What is the brand of this engine?
A
- TFE 731-20AR or 20BR
2
Q
Thrust output of these engines?
A
- 3,500lbs. of max thrust
- 3,650lbs. of thrust with APR
3
Q
Basic description of this aircraft?
A
- Lightweight
- Two-spool (Hybrid Axial/Centrifugal)
- Hi-Bypass ratio (3:1)
- DEEC
4
Q
Describe N1 spool
A
- 4-stage (LP) axial-compressor connected on a common shaft to 3 (LP) axial-turbines
5
Q
Describe N2 spool
A
- 1 (HP) Centrifugal Impeller connected on a common shaft to a single stage (HP) turbine
6
Q
Overspeed protections?
A
- 107% N1
- 109% N2
Only in ENG CMPTr (ON) (MAN) Mode
7
Q
What is a tower shaft?
A
- A shaft in between the last stage of the (LP) compressor and (HP) Impeller
- Its purpose is to drive the accessory gear box
8
Q
What is a planetary gearbox?
A
- It is to reduce the speed of the (LP) common shaft for the fan
9
Q
How many fuel nozzles per engine?
A
- 12
10
Q
How many ignitors plugs per engine?
A
- 2
11
Q
What is mounted on the accessory gearbox?
A
- Fuel Pumps (HP/LP)
- Oil Pump
- Fuel Control Unit (FCU)
- DC Starter/Generator
- AC Alternator
- Hydraulic Pump
- Motive Flow Fuel Pump
12
Q
Engine start sequence
A
- Start button engages DEEC to activate starter
- IGN on - 6.8% N2
- Fuel - Positive N1
- ITT within 10 seconds
- OIL Press with 10 seconds of light-off
- IGN off - 45% N2
- START OFF - 50% N2
- 2N1/3TT/5N2/150 FF
- Generator online - 95% N1 ground idle
13
Q
When will APR automatically come on?
A
- 15% differential thrust of N2
14
Q
What does DEEC provide?
A
- Thrust Management
- Rating display - N1 bug reference
- Engine overspeed protection
- Automatic start sequence
- Spool speed and temperature limiting
- Surge-free acceleration and deceleration
- Engine synchronization
- APR
