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severe upper droop stop contact occurs, the crew may
The flight characteristics of this helicopter, in general, experience lateral oscillations in the airframe. The
are similar to other single-rotor helicopters. combination of allowing rotor RPM to go below 64%,
Upper droop stop contact of the main rotor system may the failure to smoothly reduce the collective pitch to the
occur during touchdown and ground run portions of full down position, and application of aft cyclic during
autorotational landings when rotor RPM is low (below the ground run, can result in excessive coning,
64%) and collective pitch is applied. Upper droop stop damaging the upper droop stops and causing stress
contact is not, in itself, hazardous, but is an indicator of damage to the main rotor blades. If upper droop stop
a condition that could potentially be damaging. contact occurs, this should be recorded on the DA
Depending upon the severity of the upper droop stop Form 2408-13-1/-1E so that maintenance personnel
contact, the crew may feel several rapid sharp can perform an inspection before continuing flight.
SECTION V. ADVERSE ENVIRONMENTAL CONDITIONS
8 - 3 6 . A D V E R S E E N V I R O N M E N T A L 8-37. COLD WEATHER OPERATIONS.
CONDITIONS. The following paragraphs provide
Operation of the helicopter in cold weather or an arctic
information relative to operation under adverse
environment presents no unusual problems if the
environmental conditions (snow, ice, rain, turbulent air,
operators are aware of those changes that do take
extreme cold, hot weather, desert, mountainous, and
place and conditions that may exist because of the
high altitude operations) at maximum gross weights,
lower temperatures and freezing moisture.
etc. Checklists are provided only to cover specific
procedures that are characteristic of all weather (OH-58D) Engine auto (spontaneous) acceleration is a
operations. Unless otherwise provided, the checklists in state of continuous engine acceleration that can occur
Section II are sufficient for operations in adverse during cold weather starting after the introduction of
environmental conditions. fuel (opening of throttle). Engine acceleration is faster
than acceleration during normal start and does not
NOTE correspond to the throttle position for a modulated
start.
Use the hover page velocity vector for a
standby hover reference when brown out or a. Inspection. The pilot must be more thorough in
white out conditions are likely to occur. the walk-around inspection when temperatures have
8-18
TM 1-1520-248-10
been at or below 0 °C (32 °F). Water and snow may particular attention to the firewalls, rear face of the
have entered many parts during operations or in particle separator, bottom corners, and protruding
periods when the helicopter was parked unsheltered. surfaces such as guide vanes, etc.
This moisture often remains to form ice which will
immobilize moving parts or damage structure by (c) Before Starting Engine 0 °C (32 °F) and
expansion and will occasionally foul electrical circuitry. Below Perform check as specified in Section II.
Protective covers afford adequate protection against
rain, freezing rain, sleet, and snow when installed on a CAUTION
dry helicopter prior to precipitation. Since it is not
practicable to completely cover an unsheltered The installation and use of the second
helicopter, those parts not protected by covers and battery is to provide increased battery
those adjacent to cover overlap and joints require starting capacity for cold weather
closer attention, especially after a blowing snow or starting. If one battery is depleted and
freezing rain. Accumulation of snow and ice should be both batteries are placed on line together
removed prior to flight. Failure to do so can result in in parallel, starting capacity may be
hazardous flight, due to aerodynamic and center of decreased. Therefore, ensure both
gravity disturbances as well as the introduction of batteries are sufficiently charged prior to
snow, water, and ice into internal moving parts and starting.
electrical systems. The pilot should be particularly
attentive to the main and tail rotor systems and their NOTE
exposed control linkages.
b. Before Exterior Check 0 °C (32 °F) and Below. • GPU should be connected (if available)
Perform check as specified in Section II. for all cold weather starts.
c. Exterior Check 0 °C (32 °F) and Below. • Using battery preheat or warm battery
Perform exterior check as outlined in Section II, plus engine starts on single battery power can
the following checks: be accomplished in ambient temperatures
to -31 °C (-24 °F). With a second battery
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(80)
