PS Magazine - TB 43-PS-736
PS, The Preventative Maintenance Monthly
ISSUE 736
MARCH 2014
53
PS 736
MAR 14
T
he Army knows that mission demands may not always allow maintenance services
to be done on the exact days that they are scheduled. For this reason, DA Pam 750-8,
The Army Maintenance Management System (TAMMS) Users Manual,
allows units
a 10 percent variance with scheduled service dates. The variance is an exception to
normal unit maintenance. The term “variance” means this policy is for situations
beyond usual practice.
The Army doesn’t want scheduled services done too early. That would result in
waste because parts and lubricants would be disposed of before they have to be. But
scheduled services shouldn’t be delayed too long, either. That increases wear on
equipment, exposes systems to costly, preventable breakdowns and puts Soldiers at
risk for possible injuries.
Ideally, a service should be done as close to the scheduled service date as possible.
Calculating the Variance
Exceptions Apply
In days
(times)
Frequency
Scheduled Service
10%
Variance
multiplier
Authorized
Variance
(in days)
90
180
360
X
X
X
Quarterly
Semiannual
Annual
.10
.10
.10
9
18
36
Applying the Variance
S
2
9
16
23
/
30
M
1
3
10
17
24
/
31
T
1
4
11
18
25
W
2
5
12
19
26
T
3
6
13
20
27
F
4
7
14
21
28
S
1
8
15
22
S
6
13
20
27
M
7
14
21
28
T
1
8
15
22
29
W
2
9
16
23
30
T
3
10
17
24
F
4
11
18
25
S
5
12
19
26
S
1
4
11
18
25
M
2
5
12
19
26
T
3
6
13
20
27
W
4
7
14
21
28
T
1
8
15
22
29
F
2
9
16
23
30
S
3
10
17
24
31
2014
MARCH
APRIL
MAY
Reviewing
10 PerCent
VarianCe
Maintenance Management…
Reviewing
10 PerCent
VarianCe
Scheduled
services may
be based upon
days, rounds,
miles or hours.
The TMs specify
which interval
to use. The
method of
figuring the
variance is the
same.
it’s
important to
note that the
variance can
be as much
as 10 percent
ahead of
schedule to
as late as
10 percent
after
schedule.
For example,
for a
semiannual
service,
multiply 180
days by 10
percent.
The result
allows 18 days
variance from
the scheduled
date.
Some equipment is not
authorized a variance
because the service
is considered too
critical. Check your TM’s
PMCS tables for any
restrictions.
Using the semiannual service example,
mark the semiannual scheduled service
date on a calendar. Let’s say the
scheduled service date is 18 Apr 14.
2.
Count off 18
calendar days
after
18 Apr. The variance
ends
on 6 May 14.
DA Pam
7
50-8
allows the 10 percent
variance before
or
after
the scheduled service
date. Services done within
this variance window are
considered done
on time.
1.
Count off 18
calendar days
before
18 Apr, the scheduled
semiannual date. The
variance
begins
on 31 Mar 14.
my annual
service was due
last week.
am I
in
TroubLe?
don’t
sweat it!
you’re
stiLl within
your
Grace
period!
OKAaAAYYYy… I
THiNK MAYBE YOU
MiSCALCULATED YOUR
10 PERCENT variance
JUuUuST A TEeNY-
WeENiE BiT!
736 52-53.indd
1-2
2/4/14
10:36 AM
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