JOAP ATOMIC EMISSION ROTRODE

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

T56-A-(ALL SERIES)

AIRCRAFT:

(C-130) (E-2C) (E2-C+) (C-2) (P-3)

JOAP ATOMIC EMISSION ROTRODE

Abnormal Trend

(PPM Increase

in 10 hrs)

Normal Range

0-35

0-6

0-12

0-37

Marginal Range

36-45

7-9

13-18

38-48

High Range

46-54

10-11

8-9

19-24

49-59

Abnormal

55+

12+

10+

25+

60+

Average Concentration Other Elements:

Ni=1

Pb=4

Si=5

Sn=9

Ti=1

Mo=1

Caution must be exercised when evaluating this system since the power section and reduction gearbox are

lubricated with the same oil supply. Reduction gearbox lube pump failures are usually indicated when Mg

increases with some increase in Fe and Cu in combination. Reduction gearbox lube pump should be visually

inspected for galling of end plate and pump body. When Fe increase is more than Cu increase, accompanied by

moderate increase in Mg and small amount of Cr and Ag, discrepancy is usually with reduction gearbox pinion

bearing. When increase in Fe and Mg occur, accompanied by moderate increases in Cu with small amount of Cr

and Ag, then discrepancy is usually in one of three components: Power section side gear bearing, accessory case

bearing, or reduction gearbox oil pump drive gear bearing. A significant increase in Fe in absence of other wear

metals may indicate discrepancy in reduction gear train and/or rear turbine scavenge pump assembly. Dislocation

of main drive gear vibration dampener is usually indicated by a rapid increase in Mg with possibly some increase

in Fe. Inspection of vibration damper on G56/-7/15 may be accomplished through unused generator drive pad.

Inspection on G56-9 requires removal of rear case.

Main bearing balls/rollers and races

Reduction gear assembly gears

Accessory drive gears, shafts and splines

Accessory diffuser scavenge pump

Accessory turbine scavenge pump

Accessory drive housing

Reduction gear assembly oil pump

Main bearing cages

Reduction gear assembly bearings

A35