Average Concentration Other Elements:

NAVAIR 17-15-50.3

TM 38-301-3

T.O. 33-1-37-3

CGTO 33-1-37-3

ENGINE:

JT15D-5B (Cont.)

AIRCRAFT:

T-1A (USAF)

1.Provide maintenance personnel with the indicated engine components and advise them to check the

engine oil filter element for blockage IAW 1T-1A-2-71GS-00-1. If the filter element is serviceable, continue in

service. Perform the following steps after the shortest of the following intervals: between one and three

hours of operation maximum, since the initial sample or after the next flight.

a. Analyze a second engine oil sample. If analysis indicates the presence of elements in the

MARGINAL or NORMAL ranges, continue the engine in service and maintain a normal sampling

interval.

b. Inspect the engine oil filter element IAW 1T-1A-2-71GS-00-1. Advise the LSC of any

contamination found.

c. If analysis of the second oil sample indicates the presence of elements in the HIGH or

ABNORMAL ranges, perform the following steps.

Obtain and analyze third and fourth engine oil samples during and after a one-hour engine

ground run. Take the third sample after 30 minutes of operation and the fourth after the

conclusion of the ground run.

Inspect the engine oil filter element IAW 1T-1A-2-71GS-00-1. If the filter element is

serviceable, continue in service.

If analysis of the third and fourth samples indicate the presence of elements in the NORMAL

range, continue the engine in service and return to the normal sampling interval.

If analysis of the third and fourth samples indicate the presence of elements in the

MARGINAL range, continue the engine in service with special sampling intervals.

If analysis of the third and fourth samples indicate the presence of elements in the HIGH or

ABNORMAL ranges, provide the JOAP laboratory results to the LSC for a recommended

course of action..

& Mo Cr V MN

Nos. 1, 2, 3, 3 and 4 bearings and associated races.

Si Co W Ni Cu

& Cr Mn Si Ni

Accessory gearbox driveshaft upper and lower tower shaft bearings.

Cu Mo

& Fe Ni Cr Mn

Nos. 1, 2, 3, 3, 4 and tower shaft bearing cages.

& Ni Cr Mn Cu

Accessory gearbox and oil pump gears.

Si Mo

& Cr Mn Si Ni

No. 4 bearing air seal (on LPT rotor.

Cu Mo

& Sn Cu Ni

Accessory gearbox plain bearings, oil check valve housings.

& Si Cu Mg

Oil pump housing, upper tower shaft bearing housing.

& Cu Mg Mn

Accessory gearbox scavenge strainer transfer tube.

A-108