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pointing hand, is utilized when there have been 1 - 1 2 . USE OF WORDS SHALL, W I L L ,
extensive changes made to an illustration. Change SHOULD, AND MAY.
symbols are not used to indicate changes in the
following: Within this technical manual the word “shall” is used to
indicate a mandatory requirement. The word “will” is
a. Introductory material. used to express a declaration of purpose. The word
“should” is used to indicate a nonmandatory but
b. Indexes and tabular data where the change preferred method of accomplishment. The word “may”
cannot be identified. i s used to indicate an acceptable method of
accomplishment.
c. Blank space resulting from the deletion of text,
an illustration, or a table.
d. Correction of minor inaccuracies, such as
spelling, punctuation, relocation of material, etc., unless
1-2
TM 1-1520-248-10
CHAPTER 2
HELICOPTER AND SYSTEMS DESCRIPTION AND OPERATION
SECTION I. HELICOPTER
2-1. GENERAL. 2-3. DIMENSIONS.
Figure 2-2 depicts principal dimensions of the
helicopter.
a. The helicopter has provisions for a crew of two,
consisting of a pilot and a copilot/gunner (CPG) seated
side-by-side, with the pilot in the right seat of the crew 2-4. TURNING RADIUS.
station. The crew station is equipped with dual controls Figure 2-3 depicts the turning radius of the helicopter
and necessary flight and mission instrumentation. The based on a turn about the centerline of the mast.
basic airframe consists of a fuselage and tailboom.
2-5. GROUND CLEARANCES.
b. The fuselage houses the crew station and Figure 2-2 depicts the ground clearances of the
electronic compartments, and serves as a platform for helicopter.
the engine, transmission, and main rotor system. It is
supported by a skid type landing gear.
2-6. DANGER AREAS.
Figure 2-4 depicts the different danger areas of the
c. The tailboom serves as a platform for the tail helicopter. These include danger areas of the main
rotor gearbox as well as the vertical fin and horizontal rotor, tail rotor, turbine disintegration area, exhaust
stabilizer. The control tubes to the tail rotor, and the tail heat area, rotor downwash area, high frequency
rotor driveshaft as well as the necessary component antenna, particle separator blower, laser, missile/rocket
wiring, are contained in the tailboom. and gun trajectory, missile/rocket backblast, weapons/
launcher jettison, and IR transmission (heat/noise).
d. The main rotor system consists of four composite 2-7. CREW STATION.
material blades with folding capabilities. The tail rotor is
a two-bladed teetering type system. Above the main Figure 2-5 depict the crew station of the helicopter.
rotor system the mast mounted sight (MMS) subsystem Different components which control some of the
contains a television sensor (TVS), a thermal imaging helicopter systems are called out and listed.
sensor (TIS), a laser rangefinder/designator (LRF/D),
and an optical boresight (OBS) unit. These are all 2-8. LANDING GEAR SYSTEM.
contained in a gyro-stabilized turret. Inputs from the
mast mounted sight are transmitted to the crew station a. Main Landing Gear. The main landing gear
through the multifunction display (MFD) located on the system is a fixed skid type. The system is designed to
withstand normal and autorotational landing loads at
instrument panel.
allowable helicopter gross weights and allow landing on
rough unimproved terrain. The helicopter can be
equipped with either a standard gear or a Multiple
Purpose Light Helicopter (MPLH) gear that can be 2-2. GENERAL ARRANGEMENT. raised and lowered for ease of shipping during rapid
deployment operations.
Figure 2-1 depicts the general arrangement of the b. Tail Skid. A tail skid is attached to the aft end
helicopter. Items indexed include all access openings, of the tailboom. It acts as a warning to the pilot of an
antennas, and other items referred to in the preflight inadvertent tail low landing and aids in protecting the
inspection. tail rotor from damage.
2-1
TM 1-1520-248-10
Figure 2-1. General Arrangement (Sheet 1 of 4)
2-2
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Figure 2-1. General Arrangement (Sheet 2 of 4)
2-3
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Figure 2-1. General Arrangement (Sheet 3 of 4)
2-4
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Figure 2-1. General Arrangement (Sheet 4 of 4)
2-5
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Figure 2-2. Principal Dimensions and Ground Clearance (Sheet 1 of 4)
2-6
TM 1-1520-248-10
1
2
3
4
5
3 4
5
ROCKET TO SKID
CLEARANCE 8.30 IN.
GUN TO SKID
CLEARANCE 8.40 IN.
NOTE
ATAS GROUND CLEARANCE 15.30 IN.
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(6)
