CESSNA
SECTION
3
MODEL 152
EMERGENCY PROCEDURES
1 July 1978
3-
14
MAGNETO MALFUNCTION
A sudden engine roughness or misfiring is usually evidence of magneto problems. Switching
from BOTH to either L or R ignition switch position will identify which magneto is
malfunctioning. Select different power settings and enrich the mixture to determine if
continued operation on BOTH magnetos is practicable. If not, switch to the good magneto and
proceed to the nearest airport for repairs-
LOW OIL PRESSURE
If low oil pressure is accompanied by normal oil temperature, there is a possibility the oil
pressure gage or relief valve is malfunctioning. A leak in the line to the gage is not necessarily
cause for an immediate precautionary landing because an orifice in this line will prevent a
sudden loss of oil from the engine sump. However, a landing at the nearest airport would be
advisable to inspect the source of trouble.
If a total loss of oil pressure is accompanied by a rise in oil temperature, there is good reason
to suspect an engine failure is imminent. Reduce engine power immediately and select a
suitable forced landing field. Use only the minimum power required to reach the desired
touchdown spot.
ELECTRICAL POWER SUPPLY SYSTEM MALFUNCTIONS
Malfunctions in the electrical power supply system can be detected by periodic monitoring of
the ammeter and low-voltage warning light; however, the cause of these malfunctions is
usually difficult to determine. A broken alternator drive belt or wiring is most likely the cause of
alternator failures, although other factors could cause the problem. A damaged or improperly
adjusted alternator control unit can also cause malfunctions. Problems of this nature constitute
an electrical emergency and should be dealt with immediately. Electrical power malfunctions
usually fall into two categories: excessive rate of charge and insufficient rate of charge. The
paragraphs below describe the recommended remedy for each situation.
EXCESSIVE RATE OF CHARGE
After engine starting and heavy electrical usage at low engine speeds (such as extended
taxiing) the battery condition will be low enough to accept above normal charging during the
initial part of a flight. However, after thirty minutes of cruising flight, the ammeter should be
indicating less than two needle widths of charging current. If the charging rate were to remain
above this value on a long flight, the battery would overheat and evaporate the electrolyte at
an excessive rate.
Summary of Contents for 152 1979
Page 8: ...CESSNA GENERAL MODEL 152 1 July 1978 1 2 Figure 1 1 Three View ...
Page 50: ...CESSNA SECTION 4 MODEL 152 NORMAL PROCEDURES 1 July 1978 4 12 ...
Page 62: ...CESSNA SECTION 5 MODEL 152 PERFORMANCE 1 July 1978 5 2 ...
Page 82: ...CESSNA SECTION 6 MODEL 152 WEIGHT BALANCE EQUIPMENT LIST 1 July 1978 6 2 ...
Page 87: ...CESSNA SECTION 6 MODEL 152 WEIGHT BALANCE EQUIPMENT LIST 1 July 1978 6 7 ...
Page 88: ...CESSNA SECTION 6 MODEL 152 WEIGHT BALANCE EQUIPMENT LIST 1 July 1978 6 8 ...
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Page 104: ...CESSNA SECTION 7 MODEL 152 AIRPLANE SYSTEMS DESCRIPTIONS 1 July 1978 7 4 ...
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Page 137: ...CESSNA SECTION 8 MODEL 152 HANDLING SERVICE MAINTENANCE 1 July 1978 8 2 ...