Aircraft Systems Flashcards
What is the maximum output (hp) of the engines is ____ at _____ RPM?
180 hp, 2700 RPM
What is LHAND?
L - Lycoming
H - Horizontally Opposed (cylinder heads)
A - Air Cooled
N - Normally Aspirated (no turbo charger)
D - Direct Drive
Name two facts about the oil system.
Each engine has an 8 quart capacity in a wet sump system and has a dipstick calibrated for that specific engine.
Describe the function and operation of the carburetor heat.
- The carb heat reduces the possibility of induction system icing.
- Placing the levers down (ON) causes heated unfiltered air to enter the induction system alleviating the potential for icing.
What do the cowl flaps do?
- Changing position (CLOSE - HALF - OPEN) of the cowl flaps can help maintain the desired cylinder head temperatures.
Describe the operation of the magneto/starter switches?
- They incorporate a “R”, “L”, and “BOTH” magneto in addition to the “OFF” and “START” positions.
- The switch includes a “PUSH TO PRIME” position that activates the electric priming function to supply extra fuel during engine start.
Describe the propellers.
- Two 76 inch Hartzell constant speed, full feathering, two blade propellers.
How is RPM regulated.
- RPM is controlled by an engine driven prop governor which regulates oil pressure in the prop hub.
- Speeder springs and air pressure aided by counterweights, move the blade to low RPM (high pitch)
- Engine oil boosted from the prop governor moves the blades to the high RPM (low pitch)
What happens when oil pressure is lost (falls below 950 RPMs)
When oil pressure is lost, the propeller will automatically go into the feather position.
How many volts is the Duchess’ electrical system?
28 volts
Describe the batteries.
- Two 12 volt, 25 amp lead-acid batteries connected in series.
- The battery is used for engine start and emergency power.
- Over-voltage protection is provided if voltage exceeds 31.5 volts
Describe the alternators.
- Two 28 volt, 55 amp belt-driven alternators.
- The alternators are completely separate except for the BUS TIE FUSE
Describe the flight controls.
- Push-rods and bell cranks.
How is trimming the aircraft accomplished?
- Using either the manual or electric trim system
What kind of design is the landing gear?
- Tricycle landing gear that is hydraulically actuated and fully retractable.
How is the gear held up/down?
- The gear is held up by pressure and remains locked in the down position using over-center link and spring.
How is gear retraction on the ground prevented?
- By the ground pressure safety switch located in the pitot system to deactivate the pump circuit when airspeed is below 59-63 KIAS.
How does the emergency gear extension work?
- A hydraulic bypass valve is located below the LP floor panel.
- Rotating the valve 90 degrees releases hydraulic pressure and lowers the gear.
What kind of gas can the Duchess take and how much?
- 100 (green) or 100LL (blue) aviation gas
- 51.5 gallon total capacity with 50 gallons usable per wing
Describe the fuel pumps.
- Two engine-driven (primary)
- Two electrically-driven (used for engine start, takeoff, landing, and fuel selector changes)
Describe the brakes.
- Disk brakes
- Hydraulically actuated on the main gear (independent from the landing gear)
Where is the pitot tube located?
- On the left wing
Where are the static ports located?
- One on each side of the aft fuselage
- Alternate source inside the cockpit
For what flap setting does the left stall warning vane sound?
- 0 to 16 degrees of flaps
