MAGNETO MALFUNCTION.
A sudden engine roughness or misfiring is usually evidence of
magneto problems. Switching from "BOTH" to either "LEFT" or
"RIGHT" ignition switch position will identify which magneto is
malfunctioning. Select different power settings and enrichen 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 low, or a total loss of oil pressure is accompanied by a sudden
rise in oil temperature, there is reason to suspect an engine failure is
imminent. Reduce engine power immediately and select a suitable
forced landing field. Leave the engine running at low power during
the approach, using only the minimum power required to reach the
desired touchdown spot.
LANDING GEAR MALFUNCTION PROCEDURES.
In the event of possible landing gear retraction or extension
malfunctions, there are several general checks that should be made
prior to initiating the steps outlined in the following paragraphs.
In analyzing a landing gear malfunction, first check that the
master switch is "ON" and the "LDG GEAR" and "GEAR IND" circuit
breakers are in; reset if necessary. Also, check both landing gear
position indicator lights for operation by "pressing-to-test" the light
units and rotating them at the same time to check for open dimming
shutters. A burned-out bulb can be replaced in flight by using the
bulb from the compass light or remaining gear position indicator
light.
RETRACTION MALFUNCTIONS.
If the landing gear fails to retract normally, or an intermittent
gear "UP" indicator light is present, check the gear "UP" indicator
light for proper operation and attempt to recycle the landing gear.
Place the landing gear handle in the "DWN" position. When the gear
"DWN" indicator light comes on, pull the hand pump pressure relief
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