Powerplant Flashcards
What is the engine on the CL604?
CF34-3B
What is the bypass ratio on the
CF34-3B
6.2:1
What is the normal takeoff thrust rating per engine?
8729lbs
What is the thrust for engine out operations? (APR)
9220lbs
+2%, 500 lbs of thrust
What temperature will decrease thrust at takeoff?
ISA +15
“Flat rated”
How many titanium blades does the fan consist of?
28
How many compression/ turbine stages does N1 and N2 have?
N1: 1 compressor, 4 turbine
N2: 14 compressor, 2 turbine
What controls the variable geometry compressors?
Fuel from the FCU
What percentage of power does the bypass air provide at take off?
80%
Fuel can be cutoff from the engine in what 2 ways?
Moving the thrust lever to shutoff or pressing the FIRE PUSH switch light
What is the engine driven fuel pump driven by?
The accessory gear box
What does the ECU (control amplifier) do?
Controls N1 when above 79% (provided ENG SPEED switches on)
What is the maximum allowable difference in N2 between the two engines at idle?
2%
Which valves open when the left engine START switch is pressed in?
- L & R ENG SOV
- 10th Stage ISO
- L Start valve
How much does the APR system command following an engine failure?
2%
500 lbs thrust
TR speed limitation?
60% N1 at 60 knots or less
60 @ 60
What do the engine speed switches do?
Turn ON/OFF N1 ECU
(changes from N1 to N2 mode at 79% N1)
10th Stage Bleed Air is normally used for…
- Engine Starting
- Air conditioning and pressurization
Engine cross bleed minimum for start is…
60 psi (~85% N2)
Engine air starts should not be attempted above ____ ft.
21,000
APR arming?
5 minutes after 79% N1
With APR switch in the ARM position
If a PACK fails above ____ select cowl anti-ice to on.
40,000 ft
FCU
Fuel Control Unit
Hydromechanical up to 79% N1
Speed control above 79% N1
CAUTION: turning ON/OFF at high power settings
APR activation?
N1 on one engine goes below 67.6%
Oiler?
- 15 min - 2 hour post shutdown
- 6.4 oz/0.2 qt/0.05 gal per hour
- Adding 2 quarts requires dry run
Ignitor facts
- Dual
- A channel AC ESS BUS
- B channel BATT BUS
- 55% cutoff (normal)
- Auto-ignition – A & B during stall (SPS)
VIB monitor
N1: 2.7 mils
N2: 1.7 mils
Thrust Reverser facts
- 5 sec to deploy
- 14th Stage drives Power Drive Unit (PDU)
- 24 knots max X-Wind
- Anti-ice disabled with deployment
ITT Limits
- MAX Continous 900 deg C
- MAX 2 min 928 deg C
- START 903 deg C 50 seconds
What is “cold soak” and what do you do?
- <22 degrees C for over 8 hours
- Dry motor 60 seconds
- Cycle TRs until 5 seconds or less
OIL Tempurature limits
- -40 C Start
- 45 psi minimum T/O
- 130 psi at idle 10 minutes
ITT limit for start
Thrust lever over “hump”…
- <120 C Ground start
- <90 C Air start
Engine Starter Cranking Limits
3 starts then 5 min cooling
Oil Pressure Limits
- 25 psi min
- 45 psi t/o minimum
- 115 psi Max continous
- 156 psi Cold start