Power Plant

Question 1

Temperature for all ground starts must be less than what ITT?

Answer 1

120°C Per FCOM Vol 1 2-05-4

Question 2

Temperature for all air starts must be less than what ITT?

Answer 2

90°C Per FCOM Vol 1 2-05-4

Question 3

Starter must not be used/reengage if indicated N2 rpm exceeds What?

Answer 3

55% N2

Question 4

10th-stage bleed air manifold can be pressurized to start an engine by? (3 things)

Answer 4

*APU
*External air cart
*10th-stage bleed air from the operating engine (crossbreed)

Question 5

Minimum bleed air pressures for start.
APU
External air start cart
Engine crossbleed

Answer 5

40 psi
45 psi
60 psi (approximately 85% N2)

Question 6

Oil levels should be checked between how many minutes?

Answer 6

15 minutes to two hours after engine shutdown.

Question 7

APR is armed when?

Answer 7

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.

Question 8

During takeoff the APR is activated when?

Answer 8

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.

Question 9

What monitors the N1 for the APR?

Answer 9

DCUs. (Data Concentrator Unit)

Question 10

Maximum Oil consumption is?

Answer 10

6.4 ounces or 0.05 US gallons/hour.

Question 11

Chip detector and impending oil filter bypass indications are provided where?

Answer 11

In the after equipment bay on the junction box 5 (JB5) but are not presented on EICAS.

Question 12

What engine does the 650 have?

Answer 12

CF 34-3B
Normal T/O thrust rating is 8,729 per engine. APR 9,220

Question 13

What drives the N1

Answer 13

by a shaft from the four-stage low-pressure turbine.

Question 14

N2 is driven by

Answer 14

High-pressure turbine

Question 15

Bypass air produces approximately how much thrust on takeoff?

Answer 15

80%

Question 16

Variable Geometry (VG) compressor does what?

Answer 16

The VG system optimizes the airflow’s angle of attack at the compressor blades and provides compressor stall and surge protection.

Question 17

N2 compressor gearbox drives what?

Answer 17

• 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)

Question 18

N1 control amplifier or electronic control unit (ECU) does what?

Answer 18

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.

Question 19

The engine fuel system, in addition to providing fuel for combustion is used for:

Answer 19

• 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.

Question 20

The SHUT OFF position shuts the fuel off at the?

Answer 20

FCU

Question 21

The FIRE PUSH switch/light closes the fuel at?

Answer 21

Shutoff valve

Question 22

The Fuel Control Unit (FCU) is?

Answer 22

Hydromechanical metering device that supplies fuel in response to mechanical inputs from the thrust levers.

Question 23

With the Eng Speed switch ON what automatic switchover occurs?

Answer 23

Automatic swichover from N2 to N1 speed governing occurs at 79% N1.
With the switches off the engines will revert to N2 speed control.

Question 24

Engine Bleed air is extracted from what engine stages.

Answer 24

• 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

Question 25

Starting system consists of

Answer 25

Starter control valve and the air turbine starter. The air turbine starter drives the accessoy gearbox, which in turn drives the N2 core section. DC electrical power and air from the 10th-stage bleed air manifold are required to open the starter control valve and engage the air turbine starter.

Question 26

Start Sequence when the engine START switch/light is pressed.

Answer 26

• Left, right and isolation 10th-stage bleed air SOVs open.
• Starter control valve on the associated engine opens to allow pressure from the 10th-stage mainifuold to engage the air turbine starter.
• When the starter control valve opens, a white light illuminates in the associated START swich/light.
• At 55% N2 rpm, the start control valve is de-energized and the air turbine starter disengages.

Question 27

Ignition system A is powered by?

Answer 27

AC essential bus

Question 28

Ignition system B is powered by?

Answer 28

The battery bus through a static inverter. Use B for DC starts. Summary page does not display bleed-pressure indications.

Question 29

Autoignition activation

Answer 29

Is based upon angle-of-attack (AOA) data. Both system A and B are energized by the stall warning computer.

Question 30

ENG SPEED switches off does what?

Answer 30

• Engine speed control is in N2 mode regardless of N1 rpm
• Disables the APR system.

Question 31

Hot Icon (hot start)

Answer 31

Indicates that engine has a hot start; remains displayed until engine is shut down and ITT reduces below 220°C