Miscellaneous:

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

F110-GE-129 (Cont)

AIRCRAFT:

(F-16)

b. Chrome plating may be used for repair of gearbox bearing journals. Increasing Cr may indicate the

bearing race may be spinning on the journals.

4. Miscellaneous:

a. High Si indicates oil contamination, possibly from the oil servicing cart,engine wash chemicals, or

hydraulic pump torque motor servo valve damping fluid. High Si content in oil sampled from the Hydraulic Pump

with Normal Range Si content in the oil sampled from the Lube and Scavenge Pump oil woild indicatae leakage of

the Hydraulic Pump Torque Motor Servo Valve damping solution, Hydraulic Pump replacement is recommended.

The oil-servicing cart should be checked for contamination and, if contamination is confirmed, shall be drained

and flushed. The engine shall be drained and flushed to remove Si contamination. Post maintenance samples

from the engine and oil-servicing cart, if applicable, shall be analyzed by the OAP laboratory to assure all Si

contamination has been removed.

b. Indications of Pb are not indicative of a need for further troubleshooting. Pb residue is a result of the tube

forming process.

c. Increase or abnormal oil levels in Zn or Mo, with no significant accompanying wear metals are not cause

for engine removal. However, when abnormal trends or levels occur for Zn or Mo, the oil cart shall be checked for

contamination.

d. A rise in Ag accompanied by a rise in Zn, Mg or Cu can be an indication that the engine has been

contaminated with automotive oil (10W30, 10W40, etc.). Ag, Zn, Cu and Mg should stabilize after the engine has

been drained and flushed. An Ag trend without Mg or Zn, or one which does not stabilize after the drain and flush

is an indication that an engine bearing is deteriorating. Zn levels may remain high after the 10 flight hours of local

operation. This is normal provided there is a general decreasing trend in Zn levels. Automotive oil contamination

will not cause significant damage to oil system components. The oil servicing carts should also be inspected for

contamination. Carts found to be contaminated should also be drained and flushed.

NOTE

For technical assistance, contact ASC/LPPH at DSN 785-7869 or COMM (937) 235-

7869.

A-88