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a. Rotor RPM Indicator (NR). The rotor RPM (NR) range. The warning message is automatically stored in
indicator (fig. 2-6) is located on the upper center memory for future recall.
instrument panel. The vertical scale instrument
indicates RPM in percent on a scale from 0 to 120%. d . M u l t i p a r a m e t e r D i s p l a y (MPD) D i g i t a l
Indications are received through the battery emergency Readout. Refer to paragraph 2-86.
SECTION IX. UTILITY SYSTEMS
2-58. WINDSHIELD DEFOGGING/DEFROSTING (2) Ram air controls, identified by VENT PULL
SYSTEM. decals, control the volume of air passing through the
defog nozzles. The controls are located on each side of
a. Ram Air Defogging. the center console. Each control knob has a selflocking
device that holds the control knob in the past
(1) Ram air for defogging the windshield enters position selected. Grasping and pressing the control
through two air inlet grilles (fig. 2-20), located in the knob between the thumb and two fingers and pulling
nose section, and is directed to the defog nozzles. The releases the lock and increases air volume. To
defog nozzles are located at the base of the windshield decrease the air volume, push the control knob.
and direct ram air towards the windshield. Defog
blowers are installed in each ram air duct and provide a (3) The defog blowers are powered by the DC
steady flow of air when ram air flow is insufficient to essential bus and protected by the DEFOG BLWR
defog the windshield. circuit breaker. Placing the L DEFOG BLWR and R
2-40
TM 1-1520-248-10
DEFOG BLWR switches from OFF to the L DEFOG 2-60. MISCELLANEOUS EQUIPMENT.
BLWR and R DEFOG BLWR position activates the
defog blowers. The DEFOG BLWR circuit breaker and a. Data Case. A data case is mounted on the lower
both switches are located on the overhead console (fig. aft side of the center post.
2-8).
b . N i g h t V i s i o n Goggles (NVG) Stowage
Hooks. NVG stowage hooks are located on an
b. Bleed Air Defogging/Defrosting. Distribution overhead bulkhead in the cockpit behind the pilot and
ducts carry heated air from the bleed air heating CPG.
system to the defog nozzles for windshield defogging/
defrosting. Openings in the lower distribution ducts c. Map Case. A map case is mounted on the lower
provide bleed air for defogging/defrosting lower crew left side of instrument panel.
station windows. Heated air for defrosting/defogging is
available whenever the bleed air heating system is d. Wire Strike Protection System (WSPS). The
activated. Refer to Section X for operation and control WSPS consists of two wire cutters (19 and 22, fig. 2-1)
of the bleed air heating system. installed on the upper and lower portions of the forward
fuselage. These cutters are designed to guide a wire
toward the base area where the cutting edge is located.
2-59. PITOT TUBE ANTI-ICE/DE-ICING The tip of the lower cutter is designed to break away in
SYSTEM. the event of contact with the ground or a protruding
surface, thereby reducing the possibility of airframe
damage or deformation.
The pitot tube (20, fig. 2-1) is equipped with an
electrical heater to prevent ice from forming in the pitot e. Weight on Gear Switch. A weight on gear
tube. Placing the PITOT HTR switch in the PITOT HTR switch (72, fig. 2-1) is mounted on the forward landing
position activates the heater circuit and causes a gear crosstube. The switch senses when the helicopter
PITOT HEAT ON advisory message to be displayed on is on the ground or in flight. The switch is interfaced
the MFD. The circuit is powered by the battery with the CDS because certain MFD functions can be
emergency bus and is protected by the PITOT HTR displayed only when the helicopter is on the ground.
circuit breaker. Both the PITOT HTR switch and circuit IFF also requires this switch interfacing so IFF codes
breaker are located on the overhead console (fig. 2-8). are not zeroized.
SECTION X. HEATING AND VENTILATION
2-61. BLEED AIR HEATING SYSTEM. ability of the pilot and CPG to properly
distinguish ATAS acquisition tones.
a. The bleed air heater (fig. 2-20) is installed in the
equipment compartment aft of the electrical shelf and
behind the equipment shelf. It is used for cabin heating, c. The pilot may adjust air temperature by means of
and can be used at ambient temperatures up to 35 °C a HEAT control knob (fig. 2-20) located above and aft
(95 °F). of the pilot seat on the right side of the center post.
This knob operates a control cable in the cabin roof to
b. A heater (HTR) switch located in the overhead adjust an air temperature sensor mounted in the heater
console activates the system that is protected by the discharge duct. Adjusting the sensor mixes the fresh air
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(23)
