TWINCOMANCHEC/R
STARTING ENGINES
Be sure that all radio switches, light switches and pitot heat switch are in the off position before
starting ennines.
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Master switch - on.
Gear lights - check green.
Fuel quantity - check gauge reading.
Cowl flaps - open.
Throttle controls - open l/2 inch.
Propeller controls - forward.
Mixture controls - rich.
Electric fuel pumps - on until indication on fuel flow gauge, then off.
Mixtures - idle cut-off.
Magneto switches - on.
Propellers - clear.
Starters -engage.
Mixtures - advance.
Oil pressure - check.
FLOODED START
1. Magneto switches - on.
2. Throttles - open.
3. Mixtures - idle cut-off. .
4. Electric fuel pumps - off.
5. Starters -. engage.
(When engine fires, retard throttle and advance mixture.)
I‘
Cranking periods should be limited to 30 seconds with a two minute interval. Longer cranking periods
shorten the life of the starter. Do not engage the starter immediately after releasing it .S the starter
mechanism may be damaged.
WARh44JP AND
GROUND CHECK
Check the oil pressure as soon as the engines start. If no pressure is indicated within thirty seconds,
stop the engine and determine the trouble. If cold temperatures exist (1CPF or below), a longer period of
time will be necessary before an indication is received.
Warm-up the engines at 1000 to 1400 RPM for not more than two minutes in warm weather and four
minutes in cold. The engines are warm enough for take-off when no faltering occurs with the throttle
opened. Avoid prolonged idling at low RPM to prevent fouled spark plugs. Check the magnetos with the
propeller in low pitch and the engine running at 2200 RPM. The maximum drop on each magneto should
not exceed 175 RPM while the differential drop between them should not exceed 50 RPM. Operation on
one magneto should not exceed 10 seconds.
Move the propeller controls through their complete range to check feathering action, then leave them
in the full forward low pitch position. Feathering action can be checked by running the engine between
1000 and 1500 RPM and pulling the prop control rapidly in and out of feathered position to prevent a drop
of more than 500 RPM. Excessive manifold pressure will occur if the
RPM
count falls below 1000 during
this check Propellers should be cycled three times in cold weather.
Cowl flaps permit cooling of the engines by manual control during ground operations or special
OPERATING INSTRUCTIONS
ISSUED: June 1,197O
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