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Landing Gear
- - 8 ply main (55 psi) - left main = squat switch - 3 green lts elongated, P-T-T - gear mute <25 deg flaps
- - 6 ply nose (50 psi) - right main = stall warn & mx hobbs - Emg Gear ext on panel <100kts - 6 to 7 secs to deploy
- - double puck brake - outboard stall = 0-10 deg flaps - 4 mast brake cylinders
- - 2 pistons per side - inboard stall = 25-40 deg flaps - 14" or 25 deg flaps gear warn horn - DAU
- - 4 pads per disk - barrel downlimit switches - gear unsafe annun panel
- - vented disk brake - nose uplimit deactivates heater vent blower - Day/night switch dims
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Shunt
A conductor whose resistance is known so that voltage drop will be proportional to the current flowing through it. Through Ohms law voltage or ammperage can be deduced.
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Radio Master
- Failed closed solenoid
- Switch is closed before current is applied to circuit. RM opens when BM is turned on and current is applied. RM closes when turned on.
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What illuminates alternator inop light
- 1) Turn off Alt Master
- 2) Over voltage relay
- 3) Alternator field coil breaker
- 4) Alternator belt breaks
- 5) Engine failure
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Seminole Prop System
- Forces1) Centrifugal twisting force
- 2) Spring & N2 force (36-41 psi)
- 3) Aerodynamic twisting force
- Antifeather locks - prevent engine from feather on shutdown or below 800 RPM
- Unfeathering accumulator - 100 psi N2 / 290 psi oil
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Draw the electrical system
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Draw the propeller system
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Hobbs meters
- Flight time - oil pressure on right engine
- Mx hobbs - right squat switch
- Heater hobbs - heater fuel pump
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Annunciator Panel
- * Low Bus Voltage - Tie Buss Voltage < 12.5 Vdc
- * Pitot Heat off/Inop
- Starter Engage
- * Alternator Inop
- * Oil Pressure
- Gear Warning - gear neither full up or down
- Heater overheat - 300 deg F
- * - on prior to engine start
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Engine
- 2 Engines
- Lycoming
- O-360-A1H6
- LO-360-A1H6
- 180 HP @ 2700 RPM
- Four cylinder, direct drive, horizontally opposed, air cooled.
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Voltage Regulator
- 1) Monitor - voltage tie bus, 14 Vdc
- 2) Regulate - com with other VR to balance system load
- 3) Protect - Pulls Alt off line if current > 17 Vdc
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