Cessna 17273274 Pilot Operating Handbook page 36

SECTION 3
EMERGENCY PROCEDURES
heat as required. An unexplained loss in engine speed could be
caused by carburetor ice or air intake filter ice. Lean the mixture
for maximum RPM, if carburetor heat is used continuously.
6.
Plan a landing at the nearest airport. With an extremely rapid ice
build-up, select a suitable "off airport" landing site.
7.
With an ice accumulation of 1/ 4 inch or more on the wing leading
edges, be prepared for significantly higher stall speed.
8. Leave wing flaps retracted. With a severe ice build-up on the
horizontal tail, the change in wing wake airflow direction caused
by wing flap extension could result in a loss of elevator effective­
ness.
9. Open left window and, if practical, scrape ice from a portion of the
windshield for visibility in the landing approach.
10. Perform a landing approach using a forward slip, if necessary, for
improved visibility.
11.
Approach at 65 to 75 KIAS depending upon the amount of the
accumulation.
12. Perform a landing in level attitude.
STATIC SOURCE BLOCKAGE
(Erroneous Instrument Reading Suspected)
1. Alternate Static Source Valve -- PULL ON.
2.
Airspeed -- Consult appropriate calibration tables in Section 5.
LANDING WITH A FLAT MAIN TIRE
1. Approach -- NORMAL.
2. Touchdown -- GOOD TIRE FIRST, hold airplane off flat tire as long
as possible.
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS
AMMETER SHOWS EXCESSIVE RATE OF CHARGE
(Full Scale Deflection)
1. Alternator --
2.
Alternator Circuit Breaker -- PULL.
3. Nonessential Electrical Equipment -- OFF.
4.
Flight -- TERMINATE as soon as practical.
3-8
OF- F .
CESSNA
MODEL 172N
1 July 1979