To assure ALT restart power is available if ALTs fail in flight, what should you know regarding the BAT switches?
- DO NOT TURN OFF BAT SWITCHES!
ALTs in the SR20 are self exciting and once started, provide self-generated field power to continue operating in case of a BAT failure.
Items on the circuit breaker panel Essential buses are powered by:
ALT 1
ALT 2
BAT 1
BAT 2
Items on the circuit breaker Main buses are powered by:
ALT 1
BAT 1
Items on the circuit breaker Non-Essential buses are powered by:
ALT 1
BAT 1
You’ve lost ALT 1 and BAT 1 (Main buses and Non-Essential buses are down). What items are you left with?
Essential Buses:
(ALT 2, BAT 2)
- Annun/Engine Instruments
- COM 1/GPS 1
- AI/TC #1
- HSI/PFD #1
- Stall warning horn
- Autopilot
What kind of flaps does the SR20 have?
Electronically controlled, single-slotted flaps
What will trigger the Oil Warning Light in the annunciator panel to come on?
High oil temp (240 deg F or more)
Low oil pressure (10PSI or less)
What will trigger the Oil Warning Light in the annunciator panel to come on?
High oil temp (240 deg F or more)
Low oil pressure (10PSI or less)
What does the prop-governor do?
Automatically adjusts prop pitch to regulate prop and engine RPM.
How does the prop governor work? (POH 7-55)
When you increase the throttle, what happens to oil pressure and pitch?
- Senses engine speeds through flyweights
- Senses throttle settings through cable linkage
Increased throttle = less oil = lower pitch = higher rpm
True or False: Any change in airspeed or load on the prop results in a change in prop pitch.
TRUE
Where do you find Fuel System info in the POH for the SR20?
POH 7-56 and 7-57
Tell me about the autopilot in the SR20.
POH 7-88/7-93
If installed, STEC 55
- 2-axis autopilot
- Marker Beacon Receiver
- IFR approach certified GPS(s)
- VHF communications transceivers
What can the AP on the SR20 do? (4 things)
- Heading Hold and Command
- NAV/LOC/GPS/GS tracking, high and low sensitivity, and
automatic 45° -course intercept - Altitude Hold and Command;
- GPS Steering (GPSS) for smoother turns onto a course or
during course tracking.
Pros and Cons: Fuel Injected vs Carberated
lol
How does the AP manipulate the trim?
Sets the trims to neutral
SR20 flight controls (ailerons, rudder, etc) are designed with a ____ ____ ____ system
spring cartridge return system
What kind of AP does the SR20 have installed?
S-TEC X 55
2 - axis
.. uses trim
Components of the ADAHRS:
3-axis solid state gyro and accelerometer system (combined with a magnetometer)
Magnetometer is connected to OAT probe in wing
1 pitot tube
2 static ports
G430 is connected
The flaps are operated electrically by:
A motor that moves a tortion-bar (POH 7-32)
Explain the SR20s fuel system:
Main tanks gravity feed into the Collector tanks.
Gascolator is located under nose (fuel sump)
Metering Valve boosts fuel into cylinders
Tell me about the Hydraulics System
4 Master Cylinders
Differential braking is used for taxi, no nosewheel steering
Which ALT is belt driven? How is the other driven?
ALT 1 is belt driven
ALT 2 is gear driven, located more rearward in the cowling
ALT 1 charges ____ buses and has ___V and ___A
MAIN
28V
75A
