JOAP ATOMIC EMISSION ROTRODE (Cont)

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

TF34-GE-400B (Cont.)

AIRCRAFT:

(S-3B) (Navy Only)

Main lube and scavenge pump bearings

A-Sump scavenge pump bearings and drive coupling

& Si

Accessory gearbox bearing cages

Plate

No. 7 main bearing rotating oil seal

Plate

Nos. 3, 4, 5 and 7 main bearing housings

No. 6 main bearing housing

No. 1 main bearing cage

Plate

Front fan shaft

Power take-off assembly bearing housing

No. 7 main bearing stationary oil seal

Silver, by itself, probably PTO spline wear

NOTES

1. A rapid increase of Fe could indicate No. 1 bearing spalling. This failure occurs

quickly, often with (oil analysis program) readings within normal range.

If a 4 ppm increase of Fe, or if abnormal trend of any metal is noted, or if Fe increases

in combination with a 2 ppm increase in two or more of Ag, Cr, or Ni between

consecutive samples.

Perform chip detector inspection per NAVAIR 01-S3AAA-2-4.6, WP 008 04. If engine is

not rejected for chip detector contamination, perform three ground runs: Idle-80% (for

5 minutes) idle (for 5 minutes) per run and take oil analysis program sample after each

run.

a. If ground runs confirm the 4 ppm increase in Fe or abnormal trend, remove

engine for teardown inspection.

b. If the 4 ppm increase in Fe or abnormal trend is not confirmed, place engine

on special sampling after every flight until normal trend is firmly reestablished.

2. High Si indicates oil contamination, possible from engine wash chemicals. Oil tank

should be drained and reserviced.

3. Fuel contamination in oil indicates oil cooler leak.

4. High Al indicates possible contamination from hydraulic pump expansion plug.

5. The point of contact for this equipment is Graham Harlowe (Code 05311), DSN

963-7828 or FTS (510) 263-7828.

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