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 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
GTCP36-200/201C (C-2)/GTCP36-200(F-18)*
APU (NAVY ONLY)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ti
Abnormal Trend
(PPM Increase
4
2
2
2
3
3
in 10 hrs)
Normal Range
0-9
0-4
0-3
0-3
0-5
0-5
Marginal Range
10
5
4
4
6
6
High Range
11-12
6
5
5
7-8
7-8
Abnormal
13+
7+
6+
6+
9+
9+
Average Concentration Other Elements:
In the event any critical element (wear metal) increases to the high range or an abnormal trend is indicated, take
the following steps:
1. Confirm by obtaining check sample.
2. Drain oil in accordance with maintenance manual Al-C2AHA-GAI-200, reservice, conduct a 15-minute
operational run, and send oil sample to JOAP/NOAP lab.
3. If metal concentration range is abnormal, replace APU.
4. If metal concentration range is below range, release for flight and take additional samples after 1 hour
operation. If an abnormal trend is indicated, recommend removal and request an engineering investigation.
5. Recommend close surveillance for the next 10 operating hours after the initial abnormal analysis.
*NOTE
The requirement for routine oil analysis on the GTCP36-200
APU In the F-18 series aircraft has been deleted. Evaluation
criteria is being retained for reference and use as directed by
cognizant authority.
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