(2)
FUEL BOOST PUMP CONTROL switch(es) -ON until crewmember reports fuel from the over.ow drain.
(3)
FUEL BOOST PUMP CONTROL switch(es) -OFF.
(4)
ENG POWER CONT lever(s) -OFF.
(5)
Attempt another start.
8.40.4 Engine Oil System Characteristics.
a.
It is normal to observe high engine oil pressure dur-ing initial starts when the ambient temperature is 0°C (32°F) or below. Run engine at idle until oil pressure is within limits. Oil pressure should return to the normal range after operating 5 minutes. However, time required for warm-up will depend on temperature of the engine and lu-brication system before start.
b.
During starts in extreme cold weather (near -54°C (-65°F)) , the following oil pressure characteristics are typi-cal:
(1)
Oil pressure may remain at zero for the .rst 20 to 30 seconds after initiating the start. Abort the start if oil pressure does not register within 1 minute after initiating a start.
(2)
Once oil pressure begins to indicate on the gage, it will increase rapidly and it will exceed
Change 4 8-23
the limit. This condition is normal. The time for oil pressure to decrease will depend on the am-bient temperature, but should be normal within 5 minutes after starting the engine.
(3)
Oil pressure may increase above the maximum pressure limit if the engine is accelerated above idle while oil temperature is within normal op-erating range. The pressure will decrease to within the normal operating range as the oil temperature increases.
c.
It is normal for the OIL FLTR BYPASS caution legend to be on when starting an engine with oil tempera-tures below normal because of high oil viscosity and the accumulation of oil .lter contaminants. When the engine oil temperature reaches about 38°C (100°F) during warm-up, the light should go off.
8.40.5 Taxiing. The helicopter should not be taxied until all engine temperatures and system pressures are within the normal range. All taxiing should be done at low speeds with wide-radius turns. If the tires are frozen to the surface, a slight yawing motion induced by light pedal application should break them free. Taxiing in soft snow requires higher than normal power.
DESERT AND HOT WEATHER OPERATION.
Prolonged hovering .ight in hot weather 35°C (95°F) at higher gross weight may cause transmission oil temperature to rise into the yellow precautionary range. Hovering op-erations in the precautionary range under those conditions may be considered normal.
8.41.1 Taxiing and Ground Operation. Braking and ground operation should be minimized to prevent system overheating. During ground operations, if engine oil pres-sure falls into the red gage range when the power control lever is in the idle position and/or the engine oil pressure caution light comes on when the power control lever is in the idle position, slightly advance the power control lever. If the engine oil pressure returns to the yellow range and the engine oil pressure caution light extinguishes, engine oil pressure is acceptable.
8.42 IN-FLIGHT.
8.42.1 Thunderstorm Operation.
Avoid .ight in or near thunderstorms, es-pecially in areas of observed or antici-pated lightning discharges.
a.
Tests have shown that lightning strikes may result in loss of automatic .ight controls (including stabilator), en-gine controls or electrical power. The high currents passing through the aircraft structure are expected to produce sec-ondary effects whereby damaging voltage surges are coupled into aircraft wiring.
b.
If a lightning strike occurs whereby all aircraft elec-trical power and electronics subsystems and controls are lost (including the engine ECU and the engine-driven alter-nator), both engines go immediately to maximum power with no temperature limiter or overspeed protection.
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