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pilots caution/warning panel will illuminate and remain
on until the fairing heaters reach operating temperature.
After approximately 30 to 40 seconds, the
ENG 1 and ENG 2 ANTI-ICE lights on the pilots caution/
warning panel will extinguish and the ENG 1 and
ENG 2 advisory lights, on the pilots ANTI-ICE panel,
will illuminate.
8.42.2 Inflight. Anti-ice/de-ice systems should be activated
prior to flight in potential icing conditions (visible
moisture and below freezing conditions).
a. The green BLADE, ENG 1, and ENG 2 advisory
lights on the pilots ANTI-ICE panel should be illuminated.
When actual icing conditions are encountered,
the ENG ICE light on the caution/warning panel will
illuminate and remain on during the icing encounter.
The main and tail rotor blades will accumulate ice between
heating cycles. This will result in approximately
6 to 10% increase in indicated torque (without collective
movement). When the main and tail rotor blades
heat and shed ice, there will be a slight momentary increase
in airframe vibrations and the indicated torque
will drop to approximately the original reading.
b. Particular attention should be devoted to unusual
torque rises or persistent airframe vibrations as
these may be the first indications of a blade de-ice system
malfunction. Icing rates tend to vary, even over
short distances, and may result in continuous changes
in the indicated icing rate on the ice rate meter. If continuous
large erratic rate needle movements of more
than 0.3 gm/m3 and/or large indicated torque rises are
observed, recommend moving the de-ice mode switch
(fig 2-17) to the manual MOD position, and depart the
icing conditions.
c. Prolonged flight in icing conditions will reduce
aircraft maximum range. For fuel consumption, refer to
Chapter 7 or Chapter 7A .
d. After departing the icing conditions, recommend
minimum use of the windshield wipers as shed ice may
damage main rotors, tail rotors, and engines.
8.43 GROUND OPERATIONS DURING HIGH WINDS.
The maximum wind velocity for rotor
start or stops is 45 knots from any
direction. Ground operation of the
helicopter in winds greater than 45
knots may cause the main rotor
blades to contact the fuselage or the
helicopter to roll over.
a. If surface winds above 45 knots are anticipated,
ground operations should cease and the helicopter
should be hangered or moored in accordance with
TM 1-1520-238-23. If the helicopter cannot be hangered
or moored, and sufficient time exists to shut the
helicopter down prior to winds exceeding 45 knots, do
8-21
TM 1-1520-238-10
so. Ensure rotor blades are positioned to the 45° point into the wind and maintain 100% Np/Nr, TAIL
displacement and place RTR BK switch - LOCK prior WHEEL switch - LOCK, PARK BRAKE - set, and
to shutting down the APU. operate the stabilator in automatic. Adjust the cyclic
b. If surface winds above 45 knots are inadvertentand
collective as necessary to prevent droop ‘stop
ly encountered during ground operations, head aircraft
pounding and keep the helicopter upright.
8-22
CAUTION
9.1 AIRCRAFT SYSTEMS.
TM 1-1520-238-10
CHAPTER 9
EMERGENCY PROCEDURES
Section I. AIRCRAFT SYSTEMS
This section describes the aircraft system emergencies
that may reasonably be expected to occur and presents
the procedures to be followed. Table 9-1 shows the messages
displayed on the MASTER CAUTION panels,
the caution/warning panels, and the corrective action
required. Emergency procedures are given in checklist
form when applicable. A condensed version of these
procedures is contained in the condensed checklist,
TM 1-1520-238-CL.
NOTE
The urgency of certain emergencies requires
immediate and instinctive action
by the pilot. The most important
single consideration is helicopter control.
All procedures are subordinate to
this requirement.
The MASTER CAUTION segment
should be reset after each malfunction
to allow systems to respond to possible
subsequent malfunctions. If time permits
during a critical emergency, transmit
a MAYDAY call.
9.2 DEFINITION OF EMERGENCY TERMS.
Those steps that must be performed immediately in an
emergency situation are underlined. These steps must
be performed without reference to the checklist. When
the situation permits, non-underlined steps will be accomplished
with use of the checklist.
a. The term LAND AS SOON AS POSSIBLE is defined
as landing at the nearest suitable landing area
(e.g., open field) without delay. (The primary consideration
　
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