SPECIAL INSTRUCTIONS.

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

NOTE

The above categories are subjective since no limiting increase or decrease point

value within the trend limits may be assigned. Categorization of the severity of

increases or decreases must be determined by each evaluator after considering all

factors involved. The above listing is not considered complete but is provided to

show that trend variances, even while still within limits, should be monitored to

detect impending problems prior to development of component/system failures,

whether action recommendations to operating activities are required or not.

e. Determine the appropriate recommendation using the Decision Making Guide. The majority of sample

results will be normal, with the appropriate recommendation code of A If a recommendation for maintenance

action is indicated by the Decision Making Guide, the Supplemental Diagnostic Guidance Table should be

reviewed. These tables may provide additional maintenance information concerning likely problem areas that

may warrant inclusion in the laboratory recommendation/ maintenance advisory notification to the operating

activity.

f. The above procedure can serve as a step-by-step operational guide for evaluator personnel with limited

experience, while retaining considerable flexibility for use by an experienced evaluator who can readily take into

account the many factors which influence evaluations and recommendations. The judgement and experience of

the evaluator are an important part of the evaluation process and should not be subordinated by numerical data

when unusual circumstances exist. In many cases, the Decision Making Guide provides options concerning

specific recommendations to be issued by the evaluator after considering all information, time since overhaul,

time since oil change, past component history, critical element(s), etc. Normally these optional recommendation

codes will be sufficient, but in some cases the evaluator may use recommendations not listed as applicable,

based upon a thorough evaluation of the circumstances.

NOTE

The wear metal ranges and trend criteria shown in Appendix A are intended as

guidelines to represent normal situations and average equipment oil system condition

as related to a numerical value. There will always be exceptions to the average

situation, and it is in these cases particularly that the evaluator's experience and

judgement must be carefully applied. Some equipment may be candidates for

removal before the guidelines are exceeded, such as those with rapid, sharp

increases in wear metal levels still within guidelines but accompanied by reported

equipment symptoms/malfunctions indicative of internal problems. Conversely, other

equipment may be candidates for continued operation when analysis guidelines are

exceeded, such as steady, slow, increases in concentration levels that eventually

exceed guidelines listed, but are within normal trends and there are no other

equipment operational data that indicates problems. However, in this situation the

equipment would normally be sampled more frequently in order to minimize the

possibility of missing an impending failure. Evaluators perceiving unusual situations

such as these should contact the controlling/cognizant engineering authority for the

specific equipment for guidance.

2-3. SPECIAL INSTRUCTIONS.

a. Constant Speed Drive Units. Constant Speed Drives (CSDs) are not field repairable and must be

returned to depot for overhaul. Every precaution must be taken to assure that no serviceable CSDs are removed

from service due solely to decisions resulting from high spectrometric wear metal indications. All physical and

functional inspections authorized must be used in conjunction with JOAP spectrometric analysis to ascertain that

the CSD in question is in fact malfunctioning or is producing visible gross metal to an extent beyond acceptable

limits before removal from service is recommended.

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