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22 Cards in this Set
- Front
- Back
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What is the rated thrust of the CF34-3A1/3B1
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8,729 lbs
9,220 lbs with APR operating |
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What is the difference between the 3A1 engine and the 3B1 engine?
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The 3B1 engine maintains the rated thrust to a higher temperature.
3A1 - rated thrust to ISA +5 3B1 - rated thrust to ISA +15 |
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Describe the design of the CF34 engine?
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1. Dual Rotor free turbine engine.
2. N1 fan driven by 4 stage low pressure turbine 3. N2 Compressor is a 14 stage compressor is driven by 2 stage high pressure turbine |
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When is N2 (hydromechanical) mode speed control active?
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When the thrust is less than 79.1% N1 or speed switches are off
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How many valves open with the ENG START switchlight is pressed?
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4 Valves.
1. L 10th Stage Valves 2. R 10th Stage Valves 3. L or R ATS 4. 10th stage ISOL |
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What system powers Ignition B and Ignition A?
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Ignition A: AC ESS Bus
Ignition B: DC Battery Bus *NOTE: CONT IGNITION runs both ignition systems |
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When is the APR activated?
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APR activates when N1 rolls-back to 67.6%
*Note: It will be activated for 5 minutes! |
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What happens to the N2 range with the Wing Anti-Ice on?
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Amber arc appears from 0-78% N2
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How many ignitors do the engines have?
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2 ignition systems per engine
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What does pressing the ENG STOP switchlight do?
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Disengages the ATS
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When is the APR armed?
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1. WonW
2. 79.1% N1 3. Engine Speed Switches On 4. APR Switches Armed * Note: It will be armed for 5 minutes! remember: ANWS |
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What is APR?
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Automatic Performance Reserve. It commands a 2% N1 increase (500 lbs) in the event of an engine failure
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When does the engine ATS starter cut out?
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At 55% N2.
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What does a NO START CUTOUT caution msg?
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The ATS didn't disengage
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How many horsepower is the ATS?
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65hp
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What is the temperature and pressure of the 10th stage bleed air?
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Temp - 700 C
Pressure - 170 psi |
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How many fuel nozzles are in the engine?
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14 - each is a two-stage (low and high pressure) nozzles
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At what power settings, what type of speed control is in effect?
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N2 - hydromechanical speed control - below 79.1 N1
N1 - electrical speed control - above 79.1% N1 *Note: One is measuring N1 and one is measuring N2 |
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What does the L or R ENG START msg indicate?
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The associated ATS vavle is open.
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What are the conditions necessary to operate the thrust reversers?
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1. Thrust Reversers Armed
2. 14th stage bleed air avaialable 3. Thrust Levers at idle 4. WonW or wheel spin up greater then 60 kts. |
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When is the anti-ice reactivated after deployment of the thrust reversers?
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5 seconds
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What does it mean when you get a THRUST REV UNSAFE caution msg?
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There is an electrical fault in a trigger.
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