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9 Cards in this Set
- Front
- Back
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Describe engines
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Lycoming O-360 (left) LO-360 (right)
180hp @ 2700 RPM 4-cylinder horizontally-opposed carbureted normally-aspirated 4-6 Qts oil (earlier models) |
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Describe prop system (hub)
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Hartzell full-feathering (increase oil pressure to low pitch, high RPM) 2 blade props
Prop blades are connected to piston inside hub with a linkage Nitrogen pressure and spring in hub are forcing prop into feather position Counterweights on prop blades counteract the aerodynamic twisting force (which makes blades go to low pitch/high RPM). Engine oil pressure (higher pressure from governor) forces prop blades to low pitch/high RPM. Prop won't feather below 950 RPM because of centrifugal latch pins |
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Describe prop system (governor)
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Prop control is connected by cable to governor.
Prop lever controls pressure on speeder spring, which in turn controls how easily flyweights are effected by centrifugal force. Flyweights outwards - overspeed, pilot valve moves to direct high pressure oil to prop hub to increase pitch/low RPM. Flyweights inwards - underspeed, pilot valve moves to direct high pressure oil out of prop hub to decrease pitch/high RPM. |
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Describe electrical system
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14V electrical system
12V 35 amp-hour battery (located in nose section) 60 amp alternator on each engine If one alternator fails, the other can handle the load. (50 amps load recommended to allow for the battery to be charged) Voltage regulators maintain system voltage. If voltage goes above 17V, an over-voltage relay disconnects the alternator from the system (ALT light will illuminate). External power is on lower right of nose section. |
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Describe the stall warning system
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Two electrical switches on the left wing, the outer positioned to indicate a stall when 0-10 degrees of flaps is used, and the inner 25-40 degrees. They are deactivated on the ground the the squat switch on the left main gear.
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Describe the pitot/static system
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The pitot/static is a combined head on the left wing.
It goes to the pitot/static drain by the pilot's left leg, then the pitot/static is connected to the AS, static to VS and ALT. Alternate static is available by valve on bottom of left panel. STORM WINDOW AND CABIN VENTS MUST BE CLOSED, CABIN HEATER AND DEFROSTER MUST BE ON. Pitot heat is available. |
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Describe the vacuum system
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Each engine has a vacuum pump with a regulator to maintain 4.8-5.2 vacuum.
They are connected together with a check valve in case one fails. It powers the attitude indicator only (HSI is electric slaved). A suction gauge and filter is also connected. |
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Describe the fuel system and how to crossfeed
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Fuel tank in each engine nacelle
110 gal total, 108 usable (54 ea. tank usable) Fuel selectors are under the rear seat area and operated by cable to the selector controls between the front two seats. Fuel goes to the selector, sump, to cumbustion heater pump (left selector), auxiliary pump, engine pump, then carb. WHEN ONE ENGINE IS INOP AND OP ENGINE IS X-FEED, INOP ENGINE MUST BE ON OFF NO TAKEOFFS OR LANDINGS WITH VALVE ON X-FEED. |
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Describe the heater system
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Janitrol heater
Uses 1/2 gal/hr from left tank To avoid overheat, turn to FAN for two min. on ground or leave vent open for 15 sec. in air. Heater reset button is in nose compartment. |
