WHEN TO SAMPLE
6-1. Routine Oil Samples. AOAP enrolled components will be sampled in accordance with the
sampling interval indicated for the component in appendices A and B. The oil-sampling interval
schedule for equipment will begin when the equipment was most recently sampled. Equipment
owning units may use DD Form 314 (see Chapter 3, DA Pam 738-750 for preparation and
disposition instructions) to schedule enrolled equipment for oil sampling.
6-2. Stored or Preserved Equipment. When aeronautical or nonaeronautical equipment is placed
in storage, no sampling is required. The following procedures will apply.
Equipment scheduled for storage and /or preservation will have an oil sample taken
before the equipment is placed in storage and/or preservation.
b. Equipment enrolled in AOAP that is removed from storage or a preserved state will be
operated until normal operating temperatures are reached. At that point, an oil sample will be
taken and submitted to the laboratory for analysis.
c. Army Prepositioned Stock (APS) stored materiel. The schedule for AOAP oil sampling
and testing of APS equipment lubricants is outlined in TM 38-470.
6-3. Special Samples and Laboratory Requested Samples. Special samples and laboratory
requests for a sample (resample) will not be considered as a basis for removal of a component
from service, recording the equipment as non-mission capable or as indication the aircraft is in
any danger. Special samples shall be submitted to the laboratory under the following circumstances:
a. At the discretion of the maintenance officer at any time a component malfunctions or is
suspected of being operated under abnormal conditions, which may adversely impact the normal
operation of the component.
b. After an aircraft accident or incident, regardless of the cause. Oil samples from all
components enrolled in the AOAP shall be taken and submitted for immediate analysis.
c. Prior to oil change, with a notation of the component operating hours at the time of the oil
change and the reason for the oil change. A sample shall be taken after an oil change, following
maintenance operational checks are made and the equipment has been operated at normal
d. Immediately following any flight that results in a maintenance event recorded in the flight
log, such as an in-flight failure, an overboost, or overspeed. Oil samples should also be taken
when any abnormal flight condition or malfunction is suspected to have affected an oil or grease
e. After any indication of internal damage to an oil or grease lubricated component, such as
the presence of metal particles on the magnetic plug, oil filter, or oil screen. Contaminants