Table of Contents
Advertisement
SECTION VI
ABNORMAL ENVIRONMENTAL CONDITIONS
The following adverse conditions should be given special attention.
They are: Cold Weather Operation, Hot Weather Operation and
High Altitude Ground Operation. The information that follows
may be helpful to the operator in obtaining satisfactory engine
performance while operating in these conditions.
COLD WEATHER OPERATION
(Ambient Temperature Below Freezing)
NOTE ... Prior to operation and/or storage in cold weather, assure
engine oil viscosity is SAE 30 or SAE lOW30. In the event of tem-
perorary cold weather operation, not justifying an oil change,
consideration should be given to hangaring the aircraft between
flights.
Engine starting during extremely cold weather is generally more
difficult than during temperate conditions. Cold soaking causes the
oil to become heavier (more viscous), making it more difficult for
the battery to turn the engine over. This resu'lts in a slow cranking
speed and an abnormal drain on the battery capacity. At low tem-
peratures, gasoline does not vaporize readily, further complicating
the starting problem.
False starting (failure to continue running after starting) often
results in the formation of moisture on the spark plugs due to con-
densation. This moisture can freeze and must be eliminated, either
by applying heat to the engine or removing and cleaning the plugs.
Preheating
The use of preheat and auxiliary power (battery cart) will facilitate
starting during cold weather. This procedure is recommended
anytime the temperature falls below ,20
0
F. and the aircraft has been
cold soaked in excess of two hours. Successful starts without these
aids can be expected at temperatures below normal, provided the
aircraft battery is in good condition and the ignition and fuel
systems are properly maintained.
6-1
Hide quick links:
Advertisement
Table of Contents
