http://www.flightgear.org/Docs/getstart/getstartch7.html#x13-1310007.5

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To use the regular KSFO airport which is near SFO Golden Gate Bridge
In FlightGear Version 2016.1 above
Go to [Settings] tab
In 'Additional Optional' section at the bottom, type
--aircraft=c172p --airport=KSFO --timeofday=noon 
click [Run] button 
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For Half Moon Bay airport type 
--aircraft=c172p --airport=KHAF --timeofday=noon 

Other interesting airport
VHHH - Hong Kong Intl' Airport - very beautiful
Ensure you have Scenary data downloaded for the lat/lon 22.3080° N, 113.9185° E

VOMM - Chennai Airport 



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To change AIRPORT within flight
 Menu -> Location -> Select Airport 
List of airports alphabet wise
https://en.wikipedia.org/wiki/List_of_airports_by_ICAO_code:_K

Numlock ON
h - heads up display on 


----Cockpit view--------
v - change view
Ctrl + right click - Adjust cockpit view position to fine tune if any control is not visible or to make outside view more clear
x/X - zoom in / zoom out
c - toggle cockpit
P - Caps P to view FULL PANEL (only panels in full view)
p - small p to pause the simulator

To adjust the SEAT HEIGHT, while NOT in mouse mode hold down Ctrl + DRAG MOUSE Right button
To adjust the VIEW ANGLE (without changing seatHEIGHT), while NOT in mouse mode, DRAG MOUSE Right button (without holding down control key)


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page up - throttle up until 1000 RPM in Tachometer
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tab - switch to mouse control mode. + will show on screen

HOLD DOWN Left Mouse Button to control only RUDDER (VERTICAL FLAP in tail to control side ways movement) to run straight in the runway
At 70 knots flight will take off

Apply 1 flap pressing ]







, and . - left and right brakes - useful when taxiing slowly on the runway
0 / Enter in numpad (RUDDER use only after nose wheel took off(not on ground)) - turn left / right during take off. (7 times 0 makes full left, and then 7 times enter makes straight back)
(Using the mouse. While the mouse is in yoke control mode (+ pointer shape), if you hold the left mouse button down, the mouse controls the rudder pedals instead of the yoke. The rudder pedals are connected to both the rudder and nose-wheel. This method is much more precise.)
Hold the left mouse button down to control the rudder. 
At airspeeds above 40 knots, the rudder has enough air-flow over it to steer the airplane.


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4, 6 (both from numpad with numpad on) - aileron (wing flaps) turn left / right respectively. (needs flap to be open with [, ] keys)

5 - Reset rudder/ailerons at horizontal and center positions

This is particularly useful when landing, because the airplane glides very well. If you cut down the engine power completely, the plane will descend, yet but too slowly. You need to deploy two or three flaps steps in order to brake and really descend towards the ground. 
--aircraft=c172p --airport=KSFO
Why two ways? Partially for redundancy, but mainly because they are complementary. The main effect of the rudder(tail flaps) is yaw (rotation around the vertical axis), while the main effect of the ailerons(wing flaps) is roll (rotation around the longitudonal axis).



ctrl+ 4 arrows - Look around
Or HOLD Right Mouse button and pan to view (this way Need not press another TAB)

B -  Toggle break

m/M - fuel-to-air mixture richer/leaner (m makes more petrol and less air for powerful engine) at take and landing use m. At high altitude use M to reduce fuel usage
(to test the mixture while the engine is running, try pressing M repeatedly (mix more air). The propeller will stop running at one point 
Ctrl + c - to highlight all knobs in the cockpit



TAKE OFF
So, you need to take off and rise in the air at a steady speed of around 75 knots. However, when you raise the nose slightly at 40 knots, the aircraft will probably take-off at around 55 knots. To accelerate quickly to 75 knots, lower the nose slightly immediately on take-off, then raise it once 75 knots has been achieved. You are using the yoke to control the speed of the aircraft.

LANDING
1. PRESS ] 3 TIMES TO OPEN FULL FLAPS
2. LANDING SPEED SHOULD BE ABOUT 65 KNOTS

TURNING AT FLIGHT
Keep the airplane banked around those 20° for a few minutes and keep your eyes outside the aircraft You will see the same ground features appear again and again, every 120 seconds. This shows you need 120 seconds to make a 360° turn (or 60 seconds for a 180°)turn). This is particularly useful when navigating. Whatever speed the airplane is flying, if you bank at 20ï¿1 2 you always need 60 seconds to make a 180ï¿1 2 turn in the Cessna 172P.