F-119 decision making guidelines

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

F119-PW-100A (Cont)

AIRCRAFT:

(F-22)

d. While on surveillance for Ti, Ti increases above any other sample taken during surveillance by the

abnormal trend value. Teardown is required.

e. Fe increases by the single sample jump limit (3 ppm or more) between any two consecutive samples,

Teardown is required.

f. All engines which have been disassembled for inspection due to Fe limits being exceeded are to be

placed on surveillance for 10 hours total operating time following repair.

6. When silicon (Si) reaches or exceeds 10 ppm in any two consecutive samples, perform F-22 IMIS task "test

engine perform oil contamination check run" (lcn a720000) or suitable drain and flush procedure.

Wearmetal sources - Fe and Ti are significant wearmetals in this engine.

- No. 1, 2, 3, 4, and 5 mainshaft balls/roller bearings (including races and rolling elements)

- Front, mid, and rear compartments

- Upper towershaft pinion gear / bull gear - mid compartment

- Upper towershaft ball / roller bearings - mid compartment

- Accessory ball / roller bearings - gearbox

- No. 3 bearing inner ring spinning on the bull gear mid compartment

- Carbon seal runners - front, mid, and rear compartments

- Gear rotor wear - main oil pump

- Mainshaft, upper towershaft, and accessory bearing cages (silver plated) - gearbox, front, mid, and rear

components

- No. 4 and 5 bearing nuts (silver plated) - rear compartment

- Upper towershaft pinion gear and gearbox spiral bevel gear (silver flash) - mid compartment

- Bushings in oil pump (silver impregnated) - main oil pump

NOTE:

Abnormal levels of silver can be attributed to motor oil contamination, check for high levels of zinc (i.e. >6 ppm)

Fe & Ni

- No. 4 bearing inner ring and no. 5 bearing inner ring spinning on shaft - rear compartment

- No. 5.5 carbon seal housing rubbing against oil slinger rear compartment

- OD KE's spinning on HPT shaft - rear compartment

Fe & Ti

- No. 1 bearing inner ring spinning on the fan hub front compartment

- No. 2 bearing inner ring spinning on the stub shaft - mid compartment

- No. 1, 3, and 5 bearing outer race bottoming on housing - front, mid, and rear compartments

- All carbon seal runners against seal housings (except 5.5 carbon seal runner) - front, mid, and rear

compartments

- No. 4 bearing inner ring and no. 5 bearing inner ring spinning on shaft - rear compartment

- No. 5.5 carbon seal housing rubbing against oil slinger rear compartment

- OD KE's spinning on HPT shaft - rear compartment

- No. 1 bearing inner ring spinning on the fan hub front compartment

- No. 2 bearing inner ring spinning on the stub shaft mid compartment

A-98