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 TM 5-684/NAVFAC MO-200/AFJMAN 32-1082
strands A and B is at the right; and that the break
flattens out and conforms to an oblong opening,
between strands C and D is at the left.
reducing the diameter of the rope.
(9) Tuck the strands at each break by cutting
(11) To taper the splice, make two extra tucks
strands at least 7 inches (175 millimeters) long. To
and cut away some fibers from each strand after
begin the tucking operation, tie each pair of strands
each extra tuck.
together with the first half of a square knot to pre-
(12) After the splice has been completed, ends
vent unwinding of strands from the rope. Pull each
should be cut inch (13 millimeters) long.
knot down into the rope as sketched. Tuck in each
strand twice, as in making the short splice.
(13) Use a round stick to pound down each part
(10) Untwist each strand a little before it is
of the splice and roll the splice underfoot to make it
tucked to get a smoother job, because a loose strand
compact and pliant.
Section VIII-LARGE PORTABLE AND MOBILE EQUIPMENT
15-25. large portable and mobile equipment
electrical test values and methods should conform
covered.
to ANSI/SIA A92.2. For the Air Force, provide di-
electric testing in accordance with AFTO 36C-1-4.
In addition to hand tools and protective, climbing,
(2) Boom cleaning. If high leakage currents are
and testing equipment, large portable and mobile
revealed during periodic high-voltage testing, the
equipment is often required to perform mainte-
boom should be thoroughly cleaned both inside and
nance work. Such equipment includes pole hole dig-
outside and provided with silicone replacement in
gers, floodlights, portable/mobile substations, and
accordance with the manufacturer's recommenda-
aerial lifts.
tions. Materials used in cleaning and coating must
15-26. large portable and mobile equipment
be approved by the equipment manufacturer. The
maintenance.
boom should then be retested.
(3) Mechanical and other tests and inspections.
The following maintenance instructions are neces-
These should be applied to the aerial device over its
sarily general in nature. Applicable manufacturers'
life to ensure continuing OSHA conformance.
maintenance instructions should be followed.
(a) Visually inspect welds. Use liquid-
a. Pole hole diggers. A digger is mounted on a
penetrant and magnetic-particle testing to detect
truck or tractor and consists primarily of an engine-
workmanship defects, or defects where overstress-
driven mechanism for imparting a rotary motion to
ing or fatigue is suspected. Doubtful welds should
a hole-digging auger. Maintenance of such appara-
also be x-rayed.
tus is similar to automotive maintenance in terms
of keeping gears, brake, clutch, and engine properly
and surface damage. Use strain-gage testers, dye
adjusted and lubricated.
and light-penetrant testing, or X-ray testing as ap-
b. Floodlights and spotlights. Chapter 6 gives
propriate to suspected damage.
procedures for maintaining outdoor lighting fix-
(c) Provide hydraulic pressure-testing and
tures.
setting to avoid pressures that might compromise
c. Portable /mobile substations. Portable and mo-
the hydraulic component's burst safety factor.
bile substations, used primarily for continuity of
(d) Visually inspect the ball-bearing turn-
service during maintenance and emergencies, are
maintained in accordance with the general proce-
pads, and other power components for wear. Com-
dures of chapter 3.
d. Aerial lifts. OSHA requires that aerial lifts
pare with original-equipment specifications to de-
termine which components should be replaced to
must conform to ANSI/SIA A92.2.
(1) Electrical testing. Since the working envi-
maintain the safe operation of the equipment.
(e) Provide vehicle safety tests on brakes,
ronment of an aerial device can be detrimental to
the insulation characteristics of the boom and bas-
traveling lights, headlights, seat belts, and other
ket, electrical testing of these items is necessary at
vehicle components.
frequent intervals. The basic dielectric elements
(f) Test special live-line tools used in the bas-
are: upper boom; basket liner and basket; lower
ket, including tests to determine they meet their
boom insulator; and hydraulic lines and fluid, and
electrical insulation and mechanical and hydraulic
leveling insulators. The different levels of periodic
requirements.
15-10
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