Seminole Landing Gear
What are the airspeed limitations for the landing gear? (Vlo and Vle)
Max retraction: 109
Max extension: 120
How many volts/amps does the electrical system have?
14 volt
70 amp
What is the purpose of the prop governor?
supply engine oil at various pressures
through the propeller shafts to maintain constant RPM settings; controls engine speed by varying the pitch of the propeller to match load torque
to engine torque in response to changing flight conditions. (POH 7-2)
Define critical engine.
"the engine whose failure has the most adverse effect on directional control" AFH G-5
A point, predetermined by the pilot, to be used as a marker for engine failure on the takeoff. If the engine failure occurs prior to the point, takeoff should be aborted. If the engine failure occurs after this point, engine failure procedure should be executed and takeoff continued. AFH 12-10
What is the purpose of the j hooks?
What are the electrical buses of the seminole's electrical system?
BATMAN
Battery
Avionics 1
Tie
Main
Avionics 2
Non-essential
store engine oil under pressure from the governors
which is released back to the governors for propeller unfeathering when the
propeller control lever is moved forward from the feathered position (POH 7-4)
How is the critical engine determined?
by using an acronym known as PAST; P Factor, Accelerated Slip Stream, Spiraling Slip Stream, Torque
What is the definition of all engine service ceiling?
the highest altitude at which the airplane can maintain a steady rate of climb at 100 fpm with both engines operating AFH 12-9
What are the 3 conditions under which the gear warning horn will go off?
1) Gear is not locked with throttle at 14 inches MP or less
2) gear selector switch in up position on the ground
3) gear selector in up position while flying with flaps 25 or 40
What is a voltage regulator and what is its purpose?
regulator that maintains effective load sharing between alternators
operated by centrifugal force, prevents feathering
during engine shutdown by making it impossible to feather any time the engine
speed falls below 950 RPM.
(POH 7-5)
What is the definition of Vmc?
minimum controllable airspeed. this is the minimum flight speed at which a twin engine airplane can be satisfactorily controlled when an engine suddenly become inoperative and the remaining engine is at takeoff power. AFH G-19
What is accelerate stop distance?
the runway length required to accelerate to a specified speed (Vr or Vlof as spec by manufacturer), experience an engine failure, and bring the airplane to a complete stop AFH 12-9
What are limit switches and what are their purpose?
Up limit, down limit
electrical switches that stop the flow of current to the motor of the hydraulic pump (POH 7.9)
What two annunciator pannel lights are associated with the electrical system? Under what conditions do they turn on?
ALT: comes on when either alternator fails or is turned off (POH 7-24)
LO BUS: when the electrical system drops below 12.5 Vdc
speeder spring pushes down on the fly weights, pilot valve is moved down, oil is pushed into the prop hub, when desired RPM is reached, pilot valve is then in a neutral position, oil flow from the pump stops and traps high oil pressure in the hub
With regards to determining Vmc, what is the most unfavorable weight? Why?
light
Light plane increases Vmc speed due to less lift
Light plane increases performance on operating engine which is bad for controlability
What is the definition of single-engine service ceiling?
altitude at which the multi engine airplane can no longer maintain a 50 FPM rate of climb with OEI AFH 12-9
Scenario: you are in flight and intermittently see the gear unsafe light come on and notice an associated positive electrical load. What is happening? Explain your thought process.
hydraulic leak; light comes on when gear is in transit; load increases as the hydraulic motor is actuated and the pump works to create a high pressure in the system; once the system gets to normal pressure, pump turns off. slow leak brings pressure down and causes gear to come on and cycle to begin again
Which bus is continuously powered on the Seminole regardless of battery master switch position?
battery bus
What is happening when the blue prop control lever is brought to the full aft position?
speeder spring releases pressure on the flighweights, pilot valve is moved up to allow oil pressure to relaease and return oil back to the oil sump; when desired RPM is reached, fly weight is on speed condition and pilot valve is neutral; oil flow from the prop and keeps lower pressure in the hub
What is the purpose of 14CFR 23.149?
Defines Vmc
Sets parameters for testing/determining Vmc - level playing field for all aircraft certified under part 23What is the definition of accelerate go distance?