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h. Refer to Chapter 5 for icing limitations.
8-4-4. Heater Normal Operation.
CAUTION
Cycling of the heater blower may disable
power steering control.
a. Starting.
1. Inlet and outlet coverers — Remove.
2. BATT switch — ON.
3. APU — Start (para. 8-2-18).
4. APU GEN switch — ON. RECT OFF caution
capsule extinguishes.
5. R (right) MAIN FUEL PUMP switches — ON
(only if heater is to started).
CAUTION
Pull the cockpit air knobs slowly to preclude
dirt and debris from being blasted
into the air and pilot’s eyes.
6. Push in the air control knobs.
7. Heater function switch — As desired (BLWR
ONLY or HTR ON if BLWR only, steps 8 and 9 below do
not apply).
8. HTR START switch — Press.
NOTE
If the left side of the helicopter is exposed to
the sun, the cabin thermostat may be heated
to 34
C which is sufficient to prevent starting
the heater.
9. CABIN TEMP SEL switch — As desired.
b. Heat Distribution.
1. For maximum cockpit heat proceed as follows:
(a) Pilot and copilot cockpit air control knobs
— Pull.
(b) DEFOG or DEFROST handle — Pull.
(c) CABIN AIR handle — Push.
(d) CABIN TEMP SEL switch — Full clockwise.
2. For maximum cabin heat proceed as follows:
(a) Pilot and copilot cockpit air control knobs
— Push.
(b) DEFOG or DEFROST handle — Push.
TM 1-1520-240-10
8-4-2
(c) CABIN AIR handle — Pull.
(d) Cabin adjustable outlets — Full open.
(e) CABIN TEMP SEL switch — Full clockwise.
c. Stopping.
1. Heater function switch — OFF.
NOTE
After heating and ventilating system has been
stopped with the generator(s) ON, the blower
will continue to operate until the temperature
within the heater combustion chamber is below
49
C.
2. Wait two minutes before turning generator(s)
off.
8-4-5. Alternate Operation — Heating and Ventilation
System.
The following paragraphs describe heating and ventilating
system failure modes.
8-4-6. Vibrator Contact Failure.
The heater may be equipped with either a solid state
vibrator or an electromechanical vibrator. The electromechanical
vibrator may experience vibrator contact failure,
which will result in failure of the heater to operate. Heaters
equipped with electromechanical vibrators are identified
by a rotary selector switch on the heater junction box.
The electromechanical vibrator is equipped with two separate
sets of contacts designated NORMAL and RESERVE.
Upon failure of the normal contacts, the reserve
set may be brought into operation by placing the switch
on the junction box to RESERVE. The junction box is on
the ignition unit next to the heater.
8-4-7. Heater Overheat Condition.
If the HEATER HOT caution illuminates, proceed as follows:
CAUTION
The heater function switch shall remain
ON while performing steps a. through c.
a. Wait two minutes for cool down.
b. HTR START switch — Press.
c. HEATER HOT caution — Monitor. The HEATER
HOT caution light will not extinguish until combustion
chamber temperature is below 177
C and HTR START
switch is pressed.
8-4-8. Engine Starting.
No special cold weather start procedures are
required.
8-4-9. Warmup and Ground Tests.
Allow the engine and transmission oil pressures and temperatures
to stabilize prior to takeoff. This will require
several minutes of operation at FLT.
To prevent unnecessary scratches, allow electrical windshield
heating to completely soften frost, snow, or ice
before using the windshield wipers.
8-4-10. Taxiing.
Difficulty will be encountered when taxiing on ice and
snow covered surfaces where braking action is poor.
Taxiing on the aft gear (front wheels off the ground) is
recommended; however, caution should be taken because
of the poor visibility resulting from blowing snow.
8-4-11. Takeoff.
No unusual problems are associated with either the hovering,
rolling, or vertical type takeoffs other than the effects
of blowing snow and slippery surfaces. Depending
on the weight of snow and ice accumulated on or in the
fuselage, takeoff and overall performance can be seriously
affected.
8-4-12. During Flight.
Initial hovering with cold hydraulic fluid may produce insensitive
control inputs. Hovering above 10 feet (aft
wheel clearance) is recommended under these conditions
until operation is normal. With AFCS on, light pitch
and roll oscillations can be expected during the first 10 or
　
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