TM 1-2840-252-23-2
4-41 PRESSURE TEST NO. 4 AND 5 BEARING OIL TUBES AND BEARING
4-41
PACKAGE (AVIM) (Continued)
e. Adjust regulator (13) and apply 60 psi com-
pressed air to pressurize No 4 an 5 bearing
d
oil tubes and bearing package
3. Shut off compressed air source supply valve (14)
and observe pressure gage (15) for 5 minutes
Pressure should not drop more than 1 psi
a. If pressure does not drop more than 1 psi in 5
minutes, No 4 and 5 bearing package and
bearing oil tubes are acceptable Omit follow-
ing step (b) and proceed to step 4
b. If pressure drops more than 1 psi in 5 min-
utes, No 4 and 5 bearing package and bear-
ing oil tubes are not acceptable Proceed as
follows
(1) Replace No 4 and 5 bearing oil tubes
(Ref Tasks 4-42 and 4-45) and repeat
steps 2 thru 4
(2) If leakage still exists, replace No 4 and 5
bearing package seals (Ref Tasks 4-37
and 4-40) and repeat steps 2 thru 4
(3) If leakage still exists, replace power tur-
bine (Ret Task 3-6, steps 42 thru 45 and
GO TO NEXT PAGE
4-222
