OO-C-2821
3.6.1 Crane structural stress requirements. Design of the completely
assembled crane shall be such that the maximum stress imposed shall not exceed
the minimum strength margins contained in SAE J987. Tests in accordance with
SAE J987 shall have been performed-on the model crane being provided and test
results shall be made available for Government inspection at time of first
article testing.
3.6.2 Maintainability. The crane design, together with component and
accessory location and installation, shall permit ready accessibility to all
items requiring periodic maintenance service in the field. Servicing will be
accomplished with the use of conventional, general-purpose tools associated with
equipment of this nature. The replacement and adjustment of components and
accessories shall be accomplished with minimum drainage requirements and minimum
disturbance to other elements of the crane.
3.6.3 Safety. All the safety provisions and regulations for operating the
cranes shall be in accordance with ANSI B30.5. In addition, the crane shall
comply with all Federal regulations governing equipment and personnel safety
requirements in effect on the date of manufacture.
3.6.3.1 Strike hazard. The crane counterweight, boom point and hook block
cheek plates shall be painted with black stripes applied to the basic crane
yellow color. Stripes shall be 2 inches (50.8 millimeters (mm)) wide, with
2-inch (50.8 mm) spacing extending at a 45° angle, as per ANSI Z53.1.
3.6.3.2 Hook safety latch. A safety latch shall be provided on the crane
hook to prevent the load from separating from the hook while hoisting or
lowering is in progress.
3.6.3.3 Backup alarm. A backup alarm shall be provided on the crane and
shall conform to SAE J994.
3.7 Revolving upperstructure. The upperstructure shall consist of a cab,
enclosing the machinery and operator's position, mounted on a revolving
platform. When drums are not enclosed in the cab, provisions shall be made for
weather protection of the clutches, brakes, and gears. Counterweights required
for the truck-mounted crane shall be provided.
3.7.1 Cab. The cab shall be mounted on the revolving upperstructure, shall
be fabricated from sheet steel or fiberglass, and shall have sufficient windows
and glazed doors to permit at least 180° vision for the operator in the normal
position. All glass shall be 1\4-inch (6.35 mm) nominal thickness, safety-type,
and held in place by rubber or metal channels for easy replacement. Windows
shall be arranged for easy opening and removal when required. All cab doors,
whether of the sliding or swinging type, shall be adequately restrained from
accidentally opening or closing when the crane is traveling or operating. All
doors shall be provided with means for securely locking in the closed position.
An adjustable and comfortable seat shall be provided in the cab. The seat shall
be located for maximum unobstructed visibility by the operator and positioned so
the operator may reach all control levers, pedals, and switches. When specified
(see 6.2), the upperstructure cab shall contain a commercial type heater and
defroster. The heater shall direct a steady flow of heated air to the
operator's feet and the-defroster shall be capable of defrosting at least 75
percent of the front window area. The heater shall be mounted and positioned to
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