TB 1-1520-237-20-194
Prepare aircraft for maintenance. Turn off all electrical and hydraulic power
to the aircraft.
CAUTION
Make certain that the "special" feeler gauge is inserted between the inner
face (inner diameter) of the spindle bearing (TM 1-1520-237-23P, Figure
329, item 12, P/N SB7001-048) and the outer diameter of the journal bear-
ing (inner bearing ring) (TM 1-1520-237-23P, Figure 330, item 30, P/N
SB5203-104) and not between the inner face (diameter) of the journal bear-
ing and the spindle liner assy (Figure 330, item 42, P/N
70102-08216-041/1045). For the above, MH-60 users shall refer to the -237
series technical manual pending the update of the -250 manual.
(1) With the blade resting on the droopstop, look under the bladecuff and find the outboard end
of the spherical elastomeric spindle bearing. Identify the gap between the aluminum inner diameter (face)
of the spindle bearing and the outer diameter of spindle journal bearing. Fully insert the 0.030 inch thick plastic
portion of the "special" feeler gauge into this gap at the nine (9) O'Clock position. If the "special" feeler gauge
cannot be inserted into this gap, remove the suspect spindle assembly IAW TM 1-1520-237-23-3, paragraph
5.4.1.2., or TM 1-1520-250-23-3, paragraph 5.3.1.1 and proceed to paragraph 9, correction procedures.
(2) Attempt to slide (rotate down) the "special" feeler gauge to the six (6) O'Clock position. lf the
"special" feeler gauge cannot be rotated down to the six O'Clock position, the journal bearing may have ex-
cessive wear or the sleeve bearing (P/N SB5203-202) may be missing and the suspect spindle assembly
must be removed from the aircraft to visually verify existence of sleeve bearing, P/N SB5203-202. lf the "spe-
cial" feeler gauge cannot be slid down the gap to the six O'Clock position, remove the spindle assembly IAW
TM 1-1520-237-23-3, paragraph 5.4.1.2., or TM 1-1520-250-23-3, paragraph 5.3.1.1 and proceed to para-
graph 9, correction procedures.
NOTE
Drag on the "special" feeler gauge is not reason for inspection failure.
(3) If the "special" feeler gauge is free to slide down to the six O'Clock position, then the inspection
is complete.
c. Inspection. Retail Stock. Visually verify existence of P/N SB5203-202 sleeve bearing in every
spindle bearing, P/N SB7001-048. Tag as appropriate and correct IAW paragraph 9-b. if sleeve bearing is not
installed. lf sleeve bearing is installed, the inspection is complete.
9. Correction Procedures.
a. Any on-aircraft assemblies found to be without the sleeve bearing are to be reported either via e-
mail, fax or telephone to the logistical POC, paragraph 16.b. Information to be reported includes aircraft S/N,
time since last phase and install hours. The spindle assembly and the spindle bearing shall be replaced inac-
cordance with TM 1-1520-237-23-3, paragraph 5.5 or TM 1-1520-250-23-3, paragraph 5.3. Dispose of parts
IAW paragraph 10.d. lf the sleeve is installed, inspect IAW TM 1-1520-237-23-3, paragraph 5.5 or TM
1-1520-250-23-3, paragraph 5.3.
b. Any Retail Stock Insert sleeve bearing using normal maintenance procedures IAW TM
1-1520-237-23-3, paragraph 5.5.3 or TM 1-1520-250-23-3, paragraph 5.3 and mark tag appropriately.
10. Supply/Parts and Disposition.
a. Parts Required. Spindle assy (P/N 70102-08200-056, NSN 1615-01-374-7203) and spindle bearing
assy (P/N 70102-08100-044, NSN 1615-01-082-9250) may be required to replace defective items. Bearing
sleeve (P/N SB5203-202, NSN 3120-01-083-3265) may be required for installation into new spindle bearing
assemblies in retail stock.
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