Cessna 172

Which systems on Cessna 172 would be helpful in icing condition?

• pitot heat
• windshield defrost air
• alternate static port (does not remove ice but can be used in case the static port is blocked)
• alternate air door (a spring-loaded flap that automatically opens if the main air intake filter becomes clogged)

What are the differences in Cessna 172 N / R / S?

172 R vs S:

• identical engine
• both fuel injected
• only propellers are different:
  • R: cruise propeller, 2400 rpm, 160 hp, quieter due to lower rpm.
  • S: climb propeller, 2700 rpm, 180 hp; has 60+ lb extra load (509 lb pilot + passenger)
  • P: 160 hp @ 2700 RPM

172 N vs R/S

• N is carbureted. R and S are fuel injected.
• N flap is 20/30/40, R / S is 10/20/30; N can slow down and descend faster due to the 10 extra flap.

What is Nav III?

The differences are the avionics.

• Nav I (Skyhawk) had a basic 6 pack instrumentation, a single Nav/Comm and transponder.
• Nav II (Skyhawk II): had two Nav/Comms, one with glide slope and a transponder.
• Nav III: G1000.

The G1000 manual is with a subtitle "Cessna Nav III", the manual is for a 172R, 172S, 182T, T182T, 206H, and T206H aircraft.

Can you fly without standby battery?

According to POH, looks like standby battery is required in Europe, but not in the US?