MIL-PRF-52470A (AT)
3.4.3 Penetration rate. The auger shall have a penetration rate of not less than 61 cm
(24 in.) in soil and not less than 30 cm (12 in.) in rock (see 4.5.4.3).
3.4.4 Accessory handling. The auger shall be equipped with a service hoist for removal
of auger bits from the storage pocket and assist in the installation of the bit (see 4.5.4.4).
3.4.5 Pump. The auger shall be equipped with a pump capable of delivering water at
190 L/min (liters per minute) (50 gallons per minute(gpm)) with 24 m (80 ft.) head to the hole
being drilled (see 4.5.4.5).
3.4.6 Service winch and line. A two-speed service winch shall be furnished with a
baredrum-line pull of not less than 7300 kg (16 000 lb.) at low speed and 3600 kg (8000 lb) at
high speed. The maximum bare drum-line speed shall be not less than 27 m (90 ft) per minute at
low speed and 54 m (180 ft.) per minute at high speed. The brake lever shall be of the positive-
locking type. The service winch drum shall have a spooling capacity of not less than 67 m
(200 ft.) of 1.6 cm (5/8 in.) diameter wire rope with a nominal strength of 13 000 kg (28 600 lb.).
The free end of the rope shall be fitted with a safety clevis (see 4.5.4.6). All components in the
winch system shall have at least a safety factor of two.
3.4.7 Gradeability and travel speed. The auger shall be able to transverse a 1 percent
grade at speeds of not less than 56 km/h (35 mph). The auger shall also be able to transverse a
40 percent grade (see 4.5.4.7).
3.4.8 Road test. The auger shall be able to travel secondary roads at speeds of not less
than 16 km/h (10 mph) (see 4.5.4.8).
3.4.9 Rail transport. The auger shall be sectionalized to allow for rail transport
(see 4.5.4.9).
3.4.10 Kelly bar. The auger shall have a maximum torque capacity of 20 000 N·m
(175 000 in·lb.) at speeds of 25 rpm, maximum speeds of 50 m (165 ft.) per minute and a
minimum down pressure of 13 000 kg (30 000 lb.) (see 4.5.4.10).
3.4.11 Emergency-parking brake system. The auger shall be equipped with an emergency-
parking brake system that will stop the auger in event of the failure of the main brake system and
hold the auger on 40 degree grades (see 4.5.4.11).
3.4.12 Operation. The auger shall allow for continuous operation as specified herein
(see 4.5.4.12).
3.4.13 Lifting and tiedown attachments. The complete auger shall be equipped with
lifting and tiedown attachments. Each disassembled component shall also be equipped with
tiedown attachments. The attachments shall be located so that clearance is maintained between
the slings and all exterior parts of the equipment to be lifted or tied down. Lifting attachments
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