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 40
AFM 91-19 / TM 5-629 / NAVFAC MO-314
24 May 1989
treated. The product of these three lines is
4f) and the number of round-trips (line 4a). The
entered on line 2d. The total chemical cost of
hourly driver cost, from document A, is entered
the maintenance operation is also entered on line
on line 4h. The total driver cost is the product
2d.
of lines 4g and 4h, and is entered on line 4i.
This cost is added to the vehicle costs (line 4e) to
(3) Lines 3a to 3k. These lines are used to
calculate labor costs for each type of work and
provide the total transportation cost on line 4j.
Tractor drivers' travel time was accounted for as
equipment. The operator hours for each type of
non-productive time in 3e, so it is not included
equipment is calculated by multiplying line lb by
again in 4g.
line 1c and is entered on line 3b. The equipment
operator's estimated time spent traveling be-
(5) Lines 5a to 5e. The equipment, chemi-
tween the maintenance yard and the work site,
cal, labor, and transportation costs on lines 1d,
waiting for transportation, loading and unload-
2d, 3k, and 4j are entered on lines 5a, 5b, 5c,
ing equipment, and any other unproductive
and 5d and are summed to obtain the total cost
time, is subtracted from the workhours sched-
of the maintenance operation. This is entered on
line 5e.
uled per day. The resulting number of produc-
tive operator hours per workday is entered on
c. The completed document C for the mowing
line 3c. The number of operator days required
operation in our example of Air Base Some-
where is shown in figure 6-3. Four kinds of
for the maintenance operation is calculated by
dividing line 3b by line 3c, and this is entered on
mowing equipment were used. A tractor mower
line 3d. The total number of operator hours
mowed the large grassy areas around the main
runway and taxiways, 36-inch riding mowers
required is then obtained by multiplying line 3d
operated on the inclined drainage areas, and
by the number of operator hours per workday
21-inch power mowers and weedeaters mowed
(normally 8), and this is entered on line 3e. The
smaller areas. Their costs are calculated individ-
foregoing procedure ensures that the labor cost
ually and are totaled at the bottom of the
includes all idle or unproductive time. The
document. We will explain the calculations line-
hourly labor cost for the type of worker is taken
by-line:
from document A and is entered on line 3f.
Operator costs are calculated by multiplying line
(1) Equipment Costs. Line la shows the
3e by 3f and are entered on line 3g. Supervisory
operating costs of the tractor mower and 36-inch
costs are estimated in a similar manner and are
riding mower. These figures are obtained from
entered on lines 3h, 3i, and 3j.
line 4 of document B (figure 6-2). On line lb,
the number of hours required to maintain one
(4) Lines 4a to 4j. These lines are used to
acre of each type of area is estimated. The trac-
calculate the cost of transportation to and from
tor mower is estimated to mow 2.5 acres per
the work site. An estimate of the number of
hour. or to take 0.4 hours for an acre. The rid-
round trips required to service the operation at
ing mower requires 2 hours to mow an acre. The
the site is entered on line 4a. The miles traveled
parcel sizes of 2000 and 200 acres are shown on
in one round-trip are entered on line 4b. The
line 1c. Multiplying the three lines, la, lb, and
total miles to be traveled is the product of lines
1c, yields the equipment cost for mowing each
4a and 4b and is entered on 4c. Tractor mowers
parcel. Those figures are entered on line 1d. The
and tractor sprayers are usually driven to and
equipment costs for the 21-inch power mowers
from the work site by their operators. For these,
and the weedeaters were calculated similarly.
enter the total hours of travel time on line 4c
(2) Labor Costs.
and the total cost per hour from document B on
(a) Line 3b shows the estimated time to
line 4d. For the trucks needed to transport other
equipment and operators, enter the total miles
complete the job with tractor mowers to be 800
hours (the product of lines 1b and 1c). Line 3c is
traveled on line 4c and the vehicle cost on line
the productive hours per workday. This is the
4d. Account for all the vehicles used. The
scheduled hours per day, less the nonproductive
vehicle costs per mile are estimated from figures
time used in getting people organized in the
available locally and include investment, operat-
morning, waiting for the trucks, loading the
ing, and maintenance costs, as discussed in the
instructions for document B. Line 4c is multi-
equipment, being transported to the site, unload-
plied by line 4d to obtain the total vehicle cost,
ing the equipment, and getting into operation.
which is entered on line 4e. The truck drivers'
In the evening, the process is repeated as the
time is entered on line 4g, based on the number
equipment is secured and returned to the storage
of hours needed for a round-trip to the site (line
yard. The nonproductive time is estimated in our
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