SAMPLING INTERVAL
ALLOWABLE RANGE
60 Days
54 - 66 Days
90 Days
81 - 99 Days
180 Days
162 - 198 Days
365 Days
329 - 401 Days
b. Occasionally, the laboratory will request samples be submitted more frequently in order to
maintain a component under closer surveillance. When a special sampling interval has been
instituted, it should be followed until the laboratory informs the operating unit to return the
component to the normal sampling interval.
c. The allowable range above should not interfere with sampling on a scheduled basis.
Scheduling should be established in accordance with the sampling intervals listed in appendices
components while performing other scheduled inspections or services. Scheduling will permit
the operator, crew, AOAP monitor, and other interested individuals to easily determine when the
next AOAP sampling is required.
d. If the equipment does not have a functioning hour meter use the formula, 10 miles or 16
kilometers = 1 hour of operation to calculate operating time. For example, a truck
should be sampled every 90 days or 100 hours, you should sample every 90 days or 1,000 miles
if there is no hour meter. (The sampling interval varies for different categories of equipment.)
6-5. Mailing and Delivery Instructions. When samples are to be mailed and the number is four
or less, use the shipping sack. Insert the oil sample bottle(s) into the plastic bag and seal. Place
the completed Oil Analysis Request forms into the shipping sack along with the plastic bag(s).
Send it by first-class mail to your supporting laboratory. Do not use bulk mail or parcel post.
When the number of samples is five or more, use the boxes from which the empty bottles came
in. Place the Oil Analysis Request forms in a plastic bag and lay it on top of the bottles. When
delivering a sample directly to the laboratory, fold the completed Oil Analysis Request form in
half, wrap it around the sample bottle and secure it with a rubber band.
