Engine System Flashcards
What are the 5 sections of the engine?
Inlet Section Compressor section Diffused Section Combustion Section Exhaust Section
What is the thermodynamic shaft horsepower rating of the engine?
1,800 SHP
What is the shaft horsepower rating of the engine when governed by the FCU?
1,500 SHP
What is the shaft horsepower when torque limited by the transmission to a Take Off Power (TOP)?
1,290 SHP = 100% torque (for 5 minutes)
What is the maximum continuous power (MCP) of the engine?
1,134 SHP = 88% Torque
Is there torque limiting on the engine?
No
What ratio does the compressor section increase air pressure?
7:1 Ratio
The compressor section has ____ stage axial and a ____ stage centrifugal
5 stage axial
1 stage centrifugal
What does the bleed air reservoir (Piggy Back Chamber) power?
- Cabin heating/defrost
- Oil cooler fan
- Engine de-ice
- Improved particle separator
What section are the inner liner, nozzles, Ng turbines (dive compressor motor) and Nf turbines (drive output shaft) a part of?
Combustion Section
The EGT GREEN BAND is ____ to ____ degrees C PRIOR TO STABILIZATION (startup)
0 - 950 degrees C
The EGT RED BAND is ___ degrees C upward PRIOR TO STABILIZATION (startup)
950 degrees C +
The RED TRIANGLE is ____ degrees C (MAX ENGINE START)
950 degrees C
What % Ng is the engine stabilized?
68% for 5 seconds
The EGT GREEN BAND is ____ to ____ degrees ENGINE STABILIZED
400 - 820 degrees C
The EGT WHITE BAND is ____ to ____ degrees ENGINE STABILIZED
0 - 400 degrees C
The EGT YELLOW BAND is ____ to ____ degrees ENGINE STABILIZED
820 - 880 degrees C (30 minute limit)
The EGT RED BAND is ____ to ____ degrees ENGINE STABILIZED
880 degrees C +
____ turbines drive the compressor rotor
Ng or Nf?
Ng turbines
____ turbines drive the power output shaft
Ng or Nf?
Nf
The ____ assembly is contained within the air inlet section and measures torque applied to the engine output shaft in oil pressure
Torquemeter assembly
The ____ sends the engine output shaft torque pressure (in %) to the MFD (displayed as a 3 color bar scale)
Torque transmitter
The engine torque GREEN BAND for continuous operation is ____ to ____ %
0 - 88%
The engine torque YELLOW BAND is ____ to ____% and has a 5 minute limit.
88 - 100%
The engine torque RED BAND is ____%+
100% +
Gear reduction provides a ____ RPM reduction ratio between the Nf turbines and the engine output shaft
3.22 : 1 gear reduction ratio
The VIGV (Variable inlet guide vane actuator) is controlled by linkage from the ____ and is operated by ____ pressure.
Fuel Control controls it and fuel pressure operates it
Make a note in the forms anytime you fly through what three things?
Volcanic ash, loose grass, or a salt-latent environment
Icing of the air inlet screens can be expected at what temperature?
4 degrees C (40F) or below
Fuel flow will increase about ____ lbs an hour (2%) with the bleed air heat on and ____lbs (3%) an hour with the de-ice on.
fuel flow increases 14 lbs per hour with bleed air heat on
fuel flow increases 21 lbs an hour with de-ice on
De-ice fail safes to the __ position
ON
The oil tank reservoir contains ____ US gallons of oil
3.25 gallons of oil
Engine oil filter is bolted to the Ng accessory gearbox and has a popout button when differential ___ - ____ PSI
9 - 13 PSI
The bypass valve on the engine oil filter is set to open at ____ - ____ PSI
15 - 20 PSI
Thermal lockout device prevents extension of pop-out button during starts when engine is cold at temperatures below ____ +/- ____
32 deg F +/- 20 deg F
The ODDS chip detector burns off metal particles smaller than ____ inches
.005 inches
The engine oil cooler is driven by ____
Bleed air
The Ng turbine is also known as the ____ turbine
Gas producer turbine
The Ng accessory gearbox contains what accessories?
Hint - S.O.F.T
Starter / Generator - starts engine / standby DC power
Oil Pump - pressurizes oil system
Fuel Control Unit - Meters fuel to combustion section
Ng Tachometer
What accessories are found on the Nf accessory gearbox?
Hint - T.O.T
Torquemeter boost pump - operates torquemeter assy
Overspeed Governor - bypasses the main metering valve opening to maintain constant selected Nf RPM (driven at speeds proportional to Nf speed)
Nf tachometer - sends signals to the EDCU to display the Nf RPM in %
What three components make up the Fuel Control Assembly?
Overspeed governor (Nf Speed)
Computer Section (Ng Speed)
Metering Section (Ng Speed)
