Cessna 172S Systems Guide | Complete Comprehensive Overview

October 3rd 2022

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C172S Systems Guide Overview (Cessna 172N POH)

We tried to design this book to help you understand the 172S more fully. It is not a replacement for the Systems Section in the POH for your airplane. But this book will go a deeper where possible, with include some pictures, diagrams and systems descriptions..


Instructors have a hard time explaining the electrical system on an 172 during flight training. Usually it's because they don’t really understand how electricity works.


When instructors better understand the basics of electrical systems, students and pilot enthusiasts in-turn dramatically benefit. The goal is to cover basic electricity it just a few pages. Inside you’ll be able to find a few circuit diagrams that will help you understand at a higher level.


This systems guide will finally give you a chance to help finally grasp the concepts you’ve been confused about.


Inside our Cessna 172S guide we break down the basic concepts and terms.


  • The fuel system incorporates two vented wing tanks, one in each wing. In each tank there is a fuel filler tab that sticks down into the tank on the back side of the fuel filling point.

  • If fuel is filled to the bottom edge of the fuel filler tab, the quantity of usable fuel in the tank will be 17.5 gallons rather than 26.5 gallons when full.

  • Venting of the tanks are accomplished by an interconnecting line (cross feed tube) from the top of the right fuel tank to the left tank.

  • The left tank is vented overboard via a vent that is mounted on the left wing behind the strut. Both fuel filler caps are also vented.



 

Check out what we mean by visiting the original Cessna 172S manual.


 

For this book we took on redesigning the fuel system and the electrical system diagrams. CFI Bootcamp re-designed the diagrams, used descriptive text, and followed an engineering standard. They have been constructed so that any level of learner can comprehend and grasp the core concept(s).


We tried to design this book to help you understand the 172S more fully. It is not a replacement for the Systems Section in the POH for your airplane. We will go a little deeper where possible, include some pictures to identify, and locate things in the airplane more easily.


Table of contents Cessna 172S Systems Guide

We have segmented our 172S Systems Guide as follows:


1. Airframe

2. Flight Controls

3. Trim System

4. Instrument Panel

5. Right Side Panel

6. Center Pedestal Layout

7. Baggage Compartment

8. Seats

9. Integrated Seat Belt/Shoulder Harness

10. Entrance Doors And Cabin Windows

11. Control Locks

12. Lighting Systems

13. Pitot Static System and Instruments

14. Vacuum System

15. Wing Flap System

16. Landing Gear System

17. Brake System

18. Cabin Heating, Ventilating, and Defrosting System

19. Engine

20. Engine Oil System

21. Propeller

22. Fuel System

23. Basic Electricity

24. Electrical System


Click this link for a Preview of our C172S Systems Guide.


Basic Electricity


Instructors have a hard time explaining the electrical system on an 172S (Cessna 172N) during flight training. Usually it's because we do not really understand how electricity work.


When instructors better understand the basics of electrical systems, students and pilot enthusiasts in-turn dramatically benefit. The goal is to cover basic electricity it just a few pages. Inside you’ll be able to find a few circuit diagrams that will help you understand at a higher level.


This systems guide will finally give you a chance to help finally grasp the concepts you’ve been confused about.



Flight instructors struggle with Basic Electricity inside the Cessna 172S and Cessna 172N model airplanes.



Fuel System


  • The fuel system incorporated two vented in wing tanks, one in each wing. Into the tank from the filling point there is a fuel filler tab.

  • It sticks down into the tank on the back side of the fuel filling point.

  • If fuel is filled to the bottom edge of this fuel filler tab the fuel in the tank can be filled to 17.5 gallons of usable fuel rather than 26.5 gallons.

  • Venting of the tanks are accomplished by an interconnecting line (cross feed tube) from the top of the right fuel tank to the left tank.

  • The left tank is vented overboard via a vent that is mounted on the left wing behind the strut. Both fuel filler caps are also vented.


This annunicator panel will show L Low Fuel and R when 5 Gal left in the corresponding tank inside the Cessna 172N Fuel System


Entrance Doors and Cabin WIndows


There are two entry doors. One on each side of the cabin at the pilot and co-pilot positions. The doors have a door handle and key operated door locks.


The door handle has positions OPEN, CLOSE and LOCK. The doors must be in the LOCK position prior to flight.


To close a door that comes open in flight, slow the airplane to approximately 75 knots, momentarily shove the door outward slightly, then forcefully close and lock the door.


The windows on each door can be opened via a detent equipped latch. Rotate the latch upward to open. The window will not open completely. The windows are constrained by a spring-loaded retaining arm that helps push the window outward and to hold it there.



Door handles inside the Cessna 172S and Cessna 172N model airplanes

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