Inspection Procedures-continued - TB-1-1520-237-20-2090003

TB 1-1520-237-20-209

WARNING

Prepare aircraft for maintenance. Turn off all electrical and hydraulic power to the

aircraft.

(1) With the blade resting on the dropstop, look under the bladecuff and find the outboard end of the spindle

bearing assembly, P/N 70102-08100-044/056.

(2) Visually identify a gap between the inner diameter of the aluminum spindle bearing assembly and the outer

diameter of the inner-bearing ring, PM SB5203-104.

NOTE

This is not the gag that exists between the inner diameter of the spindle bearing

assembly and the outer diameter of the spindle shaft. A cross-section illustration

of the spindle assembly and the gap relative to the parts described in this TB can

be found on the FY 99 ASAM page of the BlackHawk PM website,

"http.www.uhpo.redstone.army.mil".

(3) Confirm that a gap of consistent width is visible around the left side (from approximately the five o'clock

position to the one o' Clock position) of the inner bearing ring. Use of a light and mirror may be necessary.

(4) If no gap exists at the six O'clock and/or twelve O'clock position or gap cannot be confirmed, the sleeve

bearing P/N S85203-202, may be missing and the feeler gauge check must be performed.

b. A special feeler gauge is needed to accomplish this inspection. Contact the local LAR or the logistical POC

identified in paragraph 16b for a feeler gauge. For assistance to accomplish the on-aircraft inspection contact the local

ILAR or Sikorsky representative.

NOTE

Make sure that the feeler gauge is inserted between the inner diameter of the

spindle bearing assembly, P/N 70102-08100-044/056, and the outer diameter of the

inner bearing ring P/SB5203-104, and not between the inner diameter of the spindle

bearing assembly and the outer diameter of the spindle shaft (reference illustration

posted on Blackhawk PM website). MH-60 users shall refer to TM 1-1520-237-23

series technical manuals pending the update of TM 1-1520-250-23 manual.

(1) With the blade resting on the droopstop, look under the bladecuff and find the outboard end of the spindle

bearing assembly, P/N 70102008100-044/056. Identify the gap between the aluminum inner diameter of

the spindle bearing assembly and the outer diameter of the innerbearing ring, PM S85203-104. Fully insert

the plastic portion of the feeler gauge into this gap at the nine O'clock position. If the feeler gauge cannot

be inserted into this gap, contact the local LAR or the Sikorsky representative before proceeding to the

correction procedure of paragraph 9.

(2) Once the feeler gauge is in the (9) O'clock position, attempt to slide (rotate down) the feeler gauge to the six

(6) O'clock position. If the feeler gauge cannot be rotated down to the six O'clock position easily, the inner

bearing ring, P/ S85203-104 may have excessive wear or