Power Plant Flashcards
Temperature for all ground starts must be less than what ITT?
120°C Per FCOM Vol 1 2-05-4
Temperature for all air starts must be less than what ITT?
90°C Per FCOM Vol 1 2-05-4
Starter must not be used/reengage if indicated N2 rpm exceeds What?
55% N2
10th-stage bleed air manifold can be pressurized to start an engine by? (3 things)
*APU
*External air cart
*10th-stage bleed air from the operating engine (crossbreed)
Minimum bleed air pressures for start.
APU
External air start cart
Engine crossbleed
40 psi
45 psi
60 psi (approximately 85% N2)
Oil levels should be checked between how many minutes?
15 minutes to two hours after engine shutdown.
APR is armed when?
APR switch is selected to ARM and both engines N1 rpm is above 79%(N1 speed mode). This is indicated by the APR ARM advisory EICAS message.
During takeoff the APR is activated when?
N1 RPM drops below 67.6% rpm. The system commands both engines to increase N1 speed. The good engine N1 is increased by a minimum of 2%=500 pounds of thrust.
What monitors the N1 for the APR?
DCUs. (Data Concentrator Unit)
Maximum Oil consumption is?
6.4 ounces or 0.05 US gallons/hour.
Chip detector and impending oil filter bypass indications are provided where?
In the after equipment bay on the junction box 5 (JB5) but are not presented on EICAS.
What engine does the 650 have?
CF 34-3B
Normal T/O thrust rating is 8,729 per engine. APR 9,220
What drives the N1
by a shaft from the four-stage low-pressure turbine.
N2 is driven by
High-pressure turbine
Bypass air produces approximately how much thrust on takeoff?
80%
Variable Geometry (VG) compressor does what?
The VG system optimizes the airflow’s angle of attack at the compressor blades and provides compressor stall and surge protection.
N2 compressor gearbox drives what?
- Engine lubrication pumps
- Alternator that powers the N1 control amplifier
- Engine-driven hydralic pump (hydraulic pump 1A or 2A)
- Engine driven fuel pump
- Integral drive AC generator (IDG)
N1 control amplifier or electronic control unit (ECU) does what?
Works in tandem with the Fuel control unit (FCU). trims the FCU fuel output to maintain a N1 speed schedule for a given thrust lever setting. At above 79% N1 the amplifier controls the engine N1 rpm.
The engine fuel system, in addition to providing fuel for combustion is used for:
- Controlling and actuating the VG compressor linkage
- Cooling the engine oil
- Actuating and lubricating servos within the (FCU)
- Providing motive flow for the main ejector and scavenge ejector pumps.
The SHUT OFF position shuts the fuel off at the?
FCU
The FIRE PUSH switch/light closes the fuel at?
Shutoff valve
The Fuel Control Unit (FCU) is?
Hydromechanical metering device that supplies fuel in response to mechanical inputs from the thrust levers.
With the Eng Speed switch ON what automatic switchover occurs?
Automatic swichover from N2 to N1 speed governing occurs at 79% N1.
With the switches off the engines will revert to N2 speed control.
Engine Bleed air is extracted from what engine stages.
- 7th stage: pressuriztion of the oil seals, and the venting of engine sumps in the lubrication system.
- 10th stage: pneumatic supply to the air conditioning and pressuriztion systems, and engine starting.
- 14th stage: pnematic supply to the engine cowl and wing anti-ice systems, or thrust reverser systems
