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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
ENGINE:
PT6A-68
AIRCRAFT:
(T-6)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ni
Si
Ti
Abnormal Trend
(PPM Increase
3
3
4
3
3
3
3
10
2
in 10 hrs)
Normal Range
0-6
0-3
0-6
0-2
0-3
0-2
0-3
0-10
0-3
Marginal Range
7-11
4-6
7-11
3-4
4-6
3-4
4-5
11-27
4-5
High Range
12-15
7-8
12-16
5-6
7-9
5-6
6-7
28-34
6-7
Abnormal
16+
9+
17+
7+
10+
7+
8+
35+
8+
Average Concentration Other Elements:
The corresponding recommended maintenance action for the PT6A-68 engine based on the JOAP results is as
follows:
1. Normal or marginal range: continue engine in service and maintain normal sampling schedule.
2. High or abnormal range:
a.Inspect the engine oil filter element. If the engine is serviceable per maintenance manual, continue in
service.
b. Perform the following after the next flight:
(1) Take a second oil sample and analyze.
(2) Inspect the engine oil filter element. If engine is serviceable per maintenance manual, continue in
service.
(3) If analysis of the second oil sample indicates the presence of elements in marginal or normal ranges,
continue engine in service and maintain normal JOAP sampling schedule.
(4) If analysis of the second oil sample indicates the presence of elements in high or abnormal ranges,
continue engine in service and refer to revised JOAP sample Interval and Maintenance action in (5)
below.
(5) Revised JAOP sample interval and maintenance action for second sample test results indicating an
abnormal trend or the presence of elements in high or abnormal range:
(a) Perform a ground engine run, take an oil sample and analyze.
(b) Inspect the engine oil filter element. If engine is serviceable per maintenance manual, continue
operating engine.
(c) If analysis of the ground engine run oil sample indicates the presence of elements in the high or
abnormal ranges, return engine to an approved facility for investigation.
3. Abnormal trend.
a. Take a second oil sample prior to the next flight to confirm the abnormal trend.
b. If the second sample taken prior to the next flight indicates a return to typical normal readings, return the
engine to service and resume normal engine JOAP sampling schedule.
c. If the second sample taken prior to the next flight indicates a result which continues to fall within the
abnormal trend column, perform maintenance actions in step 2.b.(5).
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