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installed, engine starts to -45 °C (-49 °F) CAUTION
can be accomplished.
• If a battery start must be attempted when
Check that all surfaces and controls are the helicopter and battery have been coldfree
of ice or snow. soaked at temperatures below -17 °C (2
°F), preheat battery by placing BATT
NOTE switch to PREHEAT. After HEAT ON
indicator extinguishes, wait 1.5 to 2
Contraction of the fluids in the helicopter minutes b e f o r e a t t e m p t i n g s t a r t .
system at extreme low temperature causes Preheating engine will result in a faster
indication of low levels. A check made just starter cranking speed which tends to
after the previous shutdown and carried reduce the hot-start hazard by assisting
forward to the walk-around check i s the engine to reach self-sustaining speed.
satisfactory, if no leaks are in evidence.
Filling when the system is cold-soaked will (d) Engine Start 0 °C (32 °F) and Below.
reveal an over-full condition immediately Perform check as outlined in Section II.
after flight, with the possibility of forced
leaks at seals. CAUTION
(1) Main rotor  Check free of ice and snow.
(OH-58D) Engine auto (spontaneous)
(2) Engine. acceleration, caused by pressure line
(a) Inspect inlet for possible accumulations of freezing in the fuel control unit, can
snow, slush, or ice. occur when the following conditions are
met:
(b) Inspect the engine plenum chamber
through the Plexiglass window (a flashlight may be 1. Ambient temperature of -12 °C (+10 °F) or
required). Remove snow, slush, or ice, paying lower.
8-19
TM 1-1520-248-10
2. Relative humidity of 45 percent or higher. There are no unusual flight operational characteristics
in snow operations. Refer to FM 1-202, Environmental
3. The helicopter has not been hangared before Flight, for snow takeoff and landing technique.
flight or has otherwise been allowed to cold
soak.
8 - 3 9 . DESERT AND HOT WEATHER
NOTE OPERATIONS.
During cold-weather starting, the engine oil CAUTION
pressure gage may exceed the maximum
limit. The engine should be warmed up at
engine idle until the engine oil pressure
indication is below 130 psi. Aft inlet blast shield panels may be
removed as required for operations in
WARNING blowing sand, grass and other debris.
There are no unusual flight characteristics in desert
and hot weather operations. Refer to FM 1-202,
• Control system checks should be Environmental Flight, for operational technique.
performed with extreme caution when
helicopter is parked on snow and ice.
There is reduction in ground friction NOTE
holding the helicopter stationary,
controls are sensitive, and response is
immediate. • Minimize ground operations below 100
p e r c e n t NP i n s a n d y a n d d u s t y • When firing a HELLFIRE missile AGM- environments due to the loss of 3 phase
114A at temperatures below freezing, AC power to the Particle Separator
severe ice fog may be formed by the Blower.
missile exhaust plume. This ice fog can
obscure crew visibility and also • Avoid extended periods of hovering with
interfere with autonomous designation.
aircraft headed downwind in order to
(e) Engine Runup 0 °C (32 °F) and Below. m i n i m i z e engine o i l t e m p e r a t u r e
Perform the check as outlined in Section II. increases. If engine oil temperature
approaches the maximum limit, adjust
(f) Inflight Procedures 0 °C (32 °F) and aircraft heading into the wind to prevent
Below. Perform checks as outlined in Section II. HIGH OIL TEMP ENG caution message.
There are no unusual flight operational characteristics
in cold weather operations.
8 - 4 0 . T U R B U L E N C E A N D
NOTE THUNDERSTORMS.
The ENG ANTI ICE switch should be Flight in thunderstorms and heavy rain which
activated (ENG ANTI ICE position) when accompanies thunderstorms should be avoided. If
operating in visible moisture at FAT 5 °C (41 turbulence and thunderstorms are encountered
°F) or below.
inadvertently, use the following procedures:
8-38. SNOW OPERATIONS. 1. Check that seat belts and shoulder harnesses
are tightened.
WARNING
2. PITOT HTR switch  PITOT HTR.
Aft inlet shield panels shall be removed
for snow flight.
8-20
TM 1-1520-248-10
3. Airspeed  Adjust to maintain a penetration
speed corresponding to minimum torque 8-42. ICING CONDITIONS.
required; maximum endurance airspeed.
a. Intentional flight in any known icing condition is
NOTE prohibited. If icing conditions are encountered during
flight, every effort should be made to vacate the icing
　
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