BEFORE TAKE-OFF.
WARM-UP.
Since the engine is closely cowled for efficient in-flight engine
cooling, precautions should be taken to avoid overheating during
prolonged engine operation on the ground. Also, long periods of
idling at low RPM may cause fouled spark plugs. If the engine
accelerates smoothly, the airplane is ready for take-off.
MAGNETO CHECK.
The magneto check should be made at 1800 RPM as follows:
Move the ignition switch first to "R" position, and note RPM. Next
move switch back to "BOTH" to clear the other set of plugs. Then
move switch to "L" position, note RPM and return the switch to the
"BOTH" position. The RPM drop should not exceed 150 RPM on
either magneto or show greater than 50 RPM differential between
magnetos. A smooth drop off past normal is usually a sign of a too
lean or too rich mixture. If there is a doubt concerning operation of
the ignition system, RPM checks at a leaner mixture setting or at
higher engine speeds will usually confirm whether a deficiency exists.
An absence of RPM drop may be an indication of faulty grounding
of one side of the ignition system or should be cause for suspicion
that the magneto timing is set in advance of the setting specified.
ALTERNATOR CHECK.
Prior to flights where verification of proper alternator and
voltage regulator operation is essential (such as night or instrument
flights), a positive verification can be made by loading the electrical
system momentarily (3 to 5 seconds) with the landing light or by
operating the wing flaps during the engine runup (1800 RPM). The
ammeter will remain within a needle width of zero if the alternator
and voltage regulator are operating properly.
TAKE-OFF.
POWER CHECK.
It is important to check full-throttle engine operation early in the
take-off run. Any signs of rough engine operation or sluggish engine
acceleration are good cause for discontinuing the take-off.
The auxiliary fuel pump is normally off during take-offs.
However, if there is evidence of fuel vapor, as indicated by fluctuation
of the fuel flow indicator needle, or rough engine operation, the pump
should be turned "ON. It is not necessary to readjust the mixture
control when operating with the auxiliary fuel pump "ON" because
the mixture is only slightly enrichened.
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