C-172 Systems Flashcards
Describe the 172 R/S engine
L - Lycoming
H - Horizontally Opposed
A - Air Cooled
N - Normally Aspirated
D - Direct Drive
How much HP and max RPM
- 180 hp
- 2700 RPM
Engine code, cylinders, fuel injected?
Code: IO-360-L2A
Cylinders: 4
Fuel injected
How many cubic inches is the engine?
360
How many magnetos in the ignition system?
- 2 magnetos mounted on the back of the engine
- engine driven; independent of electrical system
How many spark plugs does each magneto power?
Each magneto powers 1 spark plug in each cylinder (totaling 8); redundancy/more complete combustion
Describe the oil system
- 1 oil sump
- maximum capacity is 8 quarts
- 6.5 minimum quarts for departure per ATP policy
Can you add oil to engine without instructor present?
No, instructor must verify oil level and verbally agree to amount being added
Describe the propeller
- Engine driven McCauley prop
- 76 inches
- 2 blades
- All-metal
- Fixed-pitch prop
- Max RPM 2700
Conventional aircraft have how many vacuum pumps?
- 2 engine driven vacuum pumps located ono the back of the engine
What do the vacuum pumps provide vacuum to?
Heading and attitude gyros
What is the normal operating range of the vacuum pumps?
4.5 - 5.5 inches of mercury
How is failure of the vacuum pumps indicated?
- indicated on the annunciator panel
- if 1 vacuum is lost, the other pump will power entire vacuum system
Describe vacuum system on G1000 aircraft
- 1 single engine driven vacuum pump for standby attitude indicator
- normal operating range is 4.5 - 5.5 inches of mercury
How is failure of the vacuum pumps indicated in G1000 aircraft?
- GYRO flag
- “LOW VACUUM” annunciation on PFD
- aircraft manufactured after 2022 do not have vacuum equipment installed
Describe the landing gear
fixed, tricycle-type
- tubular spring steel for main gear
- oleo (air/oil) strut on nose wheel; extends and locks in place once in the air
- nose wheel contains a shimmy damper
how is the nosewheel linked to the pedals
- spring loaded steering bungee turning the nose wheel up to 10 degrees each side of center
- differential braking allows up to 30 degrees of steering either side of center
Describe the braking system
- hydraulically-actuated
- single-disc brakes controlled by master cylinders attached to each of left seat pilot’s pedals
- right seat pedals mechanically linked to left-seat pedals
Describe the flaps
- single slot-type flaps
- electrically driven by motor in right wing
- flap position selector with detents at 0, 10, 20 and 30 degree positions
Describe the fuel system
- 2 integral tanks
- 56 gallons total capacity
- 53 usable gallons; 26.5 gallons each wing
How many fuel sumps and fuel vents?
- 13 fuel sumps; 5 under each wing and 3 under the engine cowling
- 3 fuel vents; 2 in each fuel cap and 1 under the left wing
Fuel system order of operations
- gravity-fed from the wing tanks to a three-position fuel selector valve
- reservoir tank
- electrically-driven auxiliary fuel pump, past the fuel shutoff valve
- strainer and to an engine-driven fuel pump.
- fuel/air control unit; metered and passed to a manifold which distributes fuel to each cylinder.
The auxiliary fuel pump is used for engine priming during cold engine starts.
The auxiliary fuel pump is OFF for normal takeoff and landing operations
How should the fuel selector be positioned during normal operations and shutdown for ATP
- placed in the BOTH position during normal operations
- placed in the LEFT position during the Shutdown/Terminate checklist
What to expect if air induction filter should become blocked?
- suction created by engine will open spring loaded alternate air door
- unfiltered air from inside lower cowl area will be used
- approximately 10% power loss at full throttle
Describe the electrical system
- 28 volt DC electrical system
- 24-volt lead-acid battery (C-172s w/ G1000 have isolated 24-volt standby battery)
- electrical energy supplied by 60-amp alternator on front of engine
Where is the external power receptacle located?
left side of the engine cowl
How is the electrical power distributed?
electrical buses and circuit breakers
What should you check if electrical issue occurs?
Check circuit breakers
When should you reset a circuit breaker in flight?
- reset only once in flight; essential circuit breakers should be reset if smoke/fumes not present
- only if equipment is needed for the operational environment
- do not resent non-essential circuit breakers
How is alternator failure indicated?
- Low voltage annunciator and negative reading on main battery ammeter (battery is discharging)
- execute low volts annunciator during flight/low voltage light during flight (model dependent) checklists to reactivate alternator
How long can the main battery supply power for?
- essential equipment for approx. 30 minutes
In G1000 aircraft how long can the battery/standby battery operate for without alternator?
- main battery will cease to operate below 20 volts
- with battery switch in ARM position, standby battery will provide pwr to essential bus for approx 30 minutes
Describe the exterior lighting system
- nav lights on wing tips and top of rudder
- flashing beacon on top of vertical stab
- strobe on each wingtip
cabin heat and defroster provided by what?
- exhaust muffler shroud routes fresh air past exhaust system and into cabin manifold
- mixes with unheated air through air door on right side of fuselage
