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26 Cards in this Set
- Front
- Back
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Define Vmc.
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Minimum Control Speed: Minimum speed at which there is sufficient airflow over the rudder to overcome yaw.
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List Vmc standards
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- max gross weight
- max aft centre of gravity - at sea level - flaps in t/o position - landing gear retracted - all engines developing max pwr at the time critical engine fails - critical engine windmills - max 5 degrees of bank in good engine |
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What does Vmc do as altitude increases? Why?
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Vmc decreases:
- less power output at higher altitude = less torque for rudder to overcome. |
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What does Vmc do as CofG moves forward? Why?
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Vmc decreases:
- "arm" of rudder gets longer which creates more torque to overcome yawing. |
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What is the critical engine?
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The critical engine is the engine that if it fails, will produce the most adverse yaw on the aircraft.
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Under what condition would there be a critical engine? How is it overcome in some aircraft?
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When both engines turn in the same direction, one engine has a down-going prop closer to the centre of the aircraft. That is the critical engine.
It can be overcome with counter-rotating props. |
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PA-34-200T Seneca II
Vmc |
66 KIAS
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PA-34-200T Seneca II
Vyse |
89 KIAS
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PA-34-200T Seneca II
Vxse |
78 KIAS
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PA-34-200T Seneca II
Vx |
121 KIAS
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PA-34-200T Seneca II
Vne |
195 KIAS
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PA-34-200T Seneca II
Vx |
76 KIAS
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PA-34-200T Seneca II
Vy |
89 KIAS
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PA-34-200T Seneca II
Turbulent Air Operating Speed |
136 KIAS
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PA-34-200T Seneca II
Landing Final Approach Speed (flaps 40) |
79 KIAS
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PA-34-200T Seneca II
Max demonstrated crosswind |
17 KTS
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PA-34-200T Seneca II
Airframe |
- Semi-Monocoque
- Aluminum allow |
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PA-34-200T Seneca II
Engines |
- 2 Teledyne Continental six-cylinder turbocharged
- 200 hpwr at 2575 RPM (sea level) - air cooled - fuel injected - equipped with oil coolers with low temp bypass systems - engine mounted oil filters |
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PA-34-200T Seneca II
Turbocharger |
- Ray-Jay
- opeprated by exhaust gases |
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PA-34-200T Seneca II
Propellers |
- counter-rotating
- two-blade - constant speed - controllable pitch and feathering - Hartzell props |
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PA-34-200T Seneca II
Govenors |
- on each engine
- supply engine oil at various pressures through the prop shaft to maintain constant RPM settings |
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PA-34-200T Seneca II
Landing gear |
- hydraulically operated
- fully retractable - tricycle landing gear - hydraulic pressure operation by electrically powered, reversible hydraulic pump |
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PA-34-200T Seneca II
Brake system |
- two single-disk, double puck brake assemblies
- one on each main gear |
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PA-34-200T Seneca II
Fuel system |
- tanks on each wing
- interconnected to function as a single tank - 123 usable gallons - 100 or 100LL aviation grade - continuous flow fuel injection - each engine has engine driven fuel pump - electric aux fuel system |
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PA-34-200T Seneca II
Electrical system |
- two 65 ampere alternators on each engine
- 35 ampere-hour, 12V battery - two solid state voltage regulators maintain effective load sharing (regulating 14V) - overvoltage relay in each altenator, turning it off in excess of 14V - 2000 RPM needed for 65 amps |
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PA-34-200T Seneca II
Heating, ventilation and defrosting system |
- Heated air and defrosting by Janitrol combustion heater aft fuselage
- combustion heater uses fuell from electric pump from left tank at 0.5 gallons per hour |
