7. With engine operating, remove dust caps from the
ARMY OIL ANALYSIS PROGRAM (AOAP)
engine and transmission oil sampling valves.
AOAP is an effective maintenance diagnostic tool and
8. Open sample valve on engine oil filter and drain a
not a maintenance substitute. TB 43-0106 and TM 9-
small amount of oil into a container to clear valve of grit
2300-422-23&P must not be interpreted to mean that
AOAP minimizes in any way the need to employ good
and oil upon completion of sample taking.) Fill sam-
maintenance practices and strong maintenance disci-
pling bottle to the neck shoulder and seal it. Attach DA
Form 2026 to sampling bottle.
Samples may be taken without warming a component
to operating temperature if the equipment has been
operated within the last 30 days. If the equipment has
not been operated within the last 30 days these requi-
sites apply to both routine and special sampling. Sev-
eral hours of operation are needed to completely mix
old and new oils.
1. Perfrom AFTER operation checks and services.
DO NOT ADD OIL immediately prior to taking oil
samples. When AFTER operation checks and
services indicate the need to replenish oil levels,
9. Close oil sample valve and install dust cap.
WAIT until after taking samples. New oil added
immediately prior to taking samples will adversely
10. Take oil sample from transmission in the same
effect oil analysis results.
manner (steps 7 thru 9).
2. Obtain two sample bottles (NSN 8125-01-082-
11. Stop engine (TM 9-2350-247-10).
9697) and two DA Form 2026 from the unit AOAP
12. Lower crew seat and center floor plate (TM 9-
3. Start engine (TM 9-2350-247-10). If required (see
Sampling Requirements), drive carrier to bring engine
13. Deliver sample bottles to the unit AOAP monitor.
and transmission up to normal operating tempera-
For location of nearest AOAP Laboratory and
4. Stop carrier and set the brakes (TM 9-2350-247-
complete information about AOAP, refer to TB 43-
0106. "Oil filters shall be serviced/cleaned/changed
as applicable, when:
5. Place range selector in the N (Neutral) position
and keep engine running. On M548A3, lock the steer-
a. They are known to be contaminated, or
ing wheel (TM 9-2350-247-10).
b. Service is recommended by AOAP Labo-
6. Raise crew seat and center floor plate (TM 9-2350-
ratory analysis, or
c. At prescribed hard time intervals."
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