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32 Cards in this Set
- Front
- Back
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Vne |
202 |
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Vno |
169 |
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Va |
3800lbs- 135 knots 2700lbs- 112 knots |
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VLe |
140 |
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VLo |
140 |
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Gear retraction speed |
109 |
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Vfe |
111 |
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Vyse (blue radial line) |
88 |
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Vmca (red radial line) |
56 |
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Vsse (intentional one engine inop speed) |
82 |
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Explain the landing gear on the Piper Seminole |
Hydraulically actuated fully retractable tricycle type landing gear.
Powered by an electrically powered reversible hydraulic pump. The gear is held up by hydraulic pressure. Springs assist with gear extension.
Squat switch keeps the gear from going up on ground. |
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Explain the landing gear on the Piper Seminole |
Electrically activated and hydraulically actuated. Powered by an electrically powered reversible hydraulic pump. The gear is held up by hydraulic pressure. Springs assist with gear extension and lock down with j hooks, spring tension, and an over center joint.
Left and right main gear Squat switches- left prevents accidental gear retraction on the ground and right activates stall warning horn.
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What type of brakes does a Seminole have? |
Hydraulically actuated disc brakes |
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Explain the fuel system of the Seminole. |
Two 55 gallon tanks. One gallon unusable in each tank. Two engine drive and electrically driven fuel pumps. |
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When cross feeding fuel, where does the engine draw fuel from? |
The opposite tank |
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Describe the electrical system in the seminole |
14 volt electrical system, 12 volt battery, and two 70 amp engine driven alternators. Voltage regulators maintain 14 volt output from the alternators.
Over voltage relay provides protection to make sure itndoes not exceed 17 volts |
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Vg |
90 kts |
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How is the pitch of a Seminole propeller controlled? |
Governor oil pressure, nitrogen pressure, and centrifugal force acting on counterweights. |
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How does the prop governor increase RPM? |
Oil pressure moves blades to a fine pitch (flatter) |
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How does the prop governor increase RPM? |
Oil pressure moves blades to a fine pitch (flatter) |
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How does a prop governor decrease RPM? |
Nitrogen pressure, prop hub spring tension, and centrifugal force acting on counter weights applies pressure to move them towards a high pitch (towards feathered) |
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How do unfeathering accumulators work? |
Built up oil pressure releases and help push the propeller blades to a finer pitch. |
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How does a feathering lock work? |
Spring tension engages it below 950 RPM. Above 950 RPM, centrifugal force disengages it. If you want to feather it MUST be done before 950 RPM |
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When will the gear warning horn sound off? |
Below 14” manifold pressure or flaps 25-40 and gear is not down. Or gear is handle is up on the ground |
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What are the things that affect VMC? |
M- most unfavorable weight (light) and aft CG S- standard day (more performance in single engine=more yaw) M- Max thrust in operative engine C- critical engine inop and propeller windmilling F- flaps up, gear up, trimmed for takeoff U- up to 5° of bank towards operative engine |
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Draw the landing gear system |
Back (Definition) |
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Explain what happens when the landing gear is retracted. |
The gear pump will start and pump fluid into the retract side of the actuators. Down locks will disengage, and the warning light in the cockpit will illuminate, and the landing gear will be pushed up by hydraulic pressure. The warning unsafe landing gear light will turn off when the up-limit switch is depressed. Gear is held up by hydraulic pressure only. |
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Explain what happens when the landing gear is lowered. |
To lower the landing gear, the Gear Selector switch is placed in the Down position. The gear pump will start and pump fluid into the opposite side of the three hydraulic actuators. The landing gear will begin to extend, assisted by gravity and springs. When the up-limit switches are not depressed, the red WARN GEAR UNSAFE light will illuminate. The landing gear pump will continue to operate until all three down-limit switches are depressed. The down-limit switches will also cause the three green landing gear position lights to illuminate. After all three down-limit switches are depressed, the red WARN GEAR UNSAFE light will extinguish. |
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How does emergency gear extension work? |
Utilizes a basic pressure relief valve. Pressure holding the gear up is released, the gear free falls down with spring assistance. While the landing gear is extending, the piston in the hydraulic actuator will move the hydraulic fluid into the extension side of the actuators. Max speed for emergency extension is 100 KIAS |
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What does manifold pressure measure? |
Absolute pressure of the fuel/air mixture inside the intake manifold |
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Draw out the fuel system |
Back (Definition) |
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What are the main switches in the Piper landing gear? |
Upper limit switch, down limit switch, and squat switch |
