Cessna 1973 172 - Fires; Recovery from a Spiral Dive; Engine Fire During Start on Ground

check the compass heading and make minor corrections to hold an approxi
mate com-se. Before descending into the clouds, set up a stabilized let-
down condition as follows:
(1) Apply full rich mixture.
(2) Use full carburetor heat.
(3) Reduce power to set up a 500 to 800 ft./min. rate of descent.
(4) Adjust the elevator trim tab for a stabilized descent at 90 MPH.
(5) Keep hands off the control wheel.
(6) Monitor turn coordinator and make corrections by rudder alone.
(7) Check trend of compass card movement and make cautious cor-
rections with rudder to stop the tiu-n.
(8) Upon breaking out of clouds resume normal cruising flight.
RECOVERY FROM A SPIRAL DIVE.
If a spiral is encountered, proceed as follows:
(1) Close the throtUe.
(2) Stop the turn by using coordinated aileron and rudder control to
align the symbolic airplane in the turn coordinator with the horizon
reference line.
(3) Cautiously apply elevator back pressure to slowly reduce the in-
dicated airspeed to 90 MPH.
(4) Adjust the elevator trim control to maintain a 90 MPH glide.
(5) Keep hands off the control wheel, using rudder control to hold a
straight heading.
(6) Apply carburetor heat.
(7) Clear engine occasionally, but avoid using enough power to dis-
turb the trimmed glide.
(8) Upon breaking out of clouds, apply normal cruising power and
resume flight.
FIRES.
ENGINE FIRE DURING START ON GROUND.
Improper starting procedures such as pumping the throttle diu"ing a
difficult cold weather start can cause a backfire which could ignite fuel
that has accumulated in the intake duct. In this event, proceed as follows
(1) Continue cranking in an attempt to get a start which would suck
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