should be removed, placed in a clean sample bottle, and forwarded with oil sample to assist in
evaluation.
f. Prior to performing maintenance on enrolled components and immediately after
maintenance has been completed. The repairs and change of oil will establish a new pattern or
rate of part-wear. This includes repair, replacement, or installation of any time-change parts or
components enrolled in the AOAP.
g. Prior to a component removal, regardless of the reason for removal.
h. After engine overhaul/rework and at the completion of a test cell run, test track operation,
or functional check flight.
i. Prior to transfer of equipment or overseas deployment of the components.
j. Special samples should be very clearly marked "SPECIAL" and banded with red tape or
marked in some other conspicuous manner in order that they may be easily identified by the
laboratory and processed on a priority basis
k. Special samples will satisfy requirement for routine sampling and will begin a new oil
sampling interval schedule for the component. Care must be taken to assure the next scheduled
sample is taken without exceeding the allowable range guidelines specified in paragraph 6-4.
l. Laboratory requested sample shall be submitted upon request. Resamples are requested
either as a result of a sharp increase in the wear metal content in the lubricant or because of the
amount of dirt and/or sludge in the lubricant indicates the sample was not taken properly.
NOTE: When unprotected aircraft are exposed to rain or high humidity for prolonged periods, a
special sample may be sent for analysis at the discretion of the maintenance personnel.
a. Appendices A and B prescribe the specific interval for each component. Samples should
be taken as near the prescribed interval as possible. Owing to the difficulty of sampling at the
precise interval, the following variation guidelines shall be used to plan when to sample:
SAMPLING INTERVAL
ALLOWABLE RANGE
5 hours
4-6 hours
10 hours
8 - 12 hours
12 hours
10 - 15 hours
25 hours
22 - 28 hours
30 hours
27 - 33 hours
50 hours
46 - 54 hours
100 hours
95-105 hours
