CRJ-550 Powerplant System

What is the CRJ-550 Powerplant Model Number?

CF34-8C5B1

Describe the engine type

Twin spool, high-bypass turbofan engine

Normal take-off thrust for the CF34-8C5B1

12,670 lbs

APR thrust rating for the CF34-8C5B1?

13,790 lbs

Max continuous thrust (MCT) for the CF34-8C5B1?

13,680 lbs

How many FADECs are there per engine?

There is 1 FADEC per engine

How is FADEC powered?

FADEC is powered by its on alternator on 50% N2

FADEC is powered by DC power below 50% N2

Max Altitude for a windmill start?

21,000 ft

How much of the thrust is produced by core air?

20%

How much of the thrust is produced by by-pass air?

80%

How many stages of compression are in a CF34-8C5B1?

10 Stages

What accessories are driven off the Nz accessory gear box?

FISH OIL+

Fuel Pumps

IDG

Starter (ATS)

Hydraulic pump (Engine Driven)

Oil Pump

FADEC Alternator

What is the engine bleed air used for?

Engine Start

AC Pressurization

Air Conditioning

Wing and cowl Anti Ice

What is the minimum bleed air pressure required for a cross bleed start?

42 PSI

What is the normal air source used for engine starting?

APU Bleed air

Where is the high pressure, ground air supply connection located?

On the fuselage, aft of the aft cargo bay door.

When will the starter cut-out during an engine start?

50% N2 RPM

What would cause FADEC to automatically abort a start?

Hot or Hung Start

How many ignitors are installed on each engine?

2

What supplies power to the ignitors?

IGN-A: AC ESS Bus

IGN-B: Static inverter on the battery bus

When is continuous ignition automatically activated?

When approaching a high angle of attack

What conditions are required before advancing the thrust levers to IDLE during an engine start?

Nz 20% or greater, and ITT below 120°C.

What conditions would cause Takeoff Configuration Warning?

Parking brake SET

Autopilot ON

Spoilers Extended (flight or ground spoilers)

Stab Trim out of green range

Flaps not 8° or 20°

Aileron Trim out of green range

Rudder Trim out of green range

What is APR?

Automatic Performance Reserve thrust

When is APR armed for takeoff?

When the N, RPM of both engines is within 8% of scheduled takeoff power

When is APR armed for landing?

When flaps are greater than 20°, and the landing gear is down.

When will the APR system be activated?

Thrust levers in TOGA, and Nis differ by 15% or greater after APR has been armed.

When the thrust levers are set in the MAX POWER detent.

When the HIGH PWR SCHEDULE switchlight is selected ON.

What occurs when the APR system activates?

FADEC commands a thrust increase dependent on thrust lever position.

What indication is displayed when APR is activated?

Green APR icon on the N1 gauge

If an engine fails during a go-around, will the APR system activate?

YES

What is used to deploy and stow the thrust reversers?

L reverser uses hydraulic system #1

R reverser uses hydraulic system #2

What indications will be displayed during thrust reverser deployment?

Amber REV icon on the N1 gauges during cowl transition.

Green REV icon on the Ni gauges when the reversers are fully deployed.

When do the thrust reversers need to be either stowed or at idle?

Stowed by 60kts

Idle by 75kts

Max Continuous Oil Temperature

155°C

Max Permissible Oil Temperature

163°C (15 minutes max)

Where can the oil quantity be checked?

On the EICAS MENU page

How is the oil cooled?

Fuel/oil heat exchanger

What is the total quantity of the engine oil tanks?

7.2 quarts

When will OEO (one engine only) thrust be activated?

N1 mismatch 15% RPM

The left engine is the master engine for?

N1 & N2 Sync

The primary thrust setting reference is?

N1

What doe the engines supply

Thrust

Hydraulics power

Electrical power

Bleed air

What engine components move in the VG system?

The inlet guide vanes (IGVs) and first four compressor vaneS

What powers the actuators that move the VG vanes?

High-pressure fuel controlled by the Fuel Metering Unit (FMU).

What is the purpose of Variable Geometry (VG) in the CRJ-550 engine?

VG adjusts airflow into the compressor to prevent stalls, improve efficiency, and optimize performance.

T2 PROBE, what is it?

N1 Fan Inlet Temperature Probe

What is ITT temperature?

combustion gas temp between HP & LP turbines

How does trust reverser work?

Electronically controlled, hydraulically actuated