Summary of Problem. - TB-1-1520-237-20-1710002

TB 1-1520-237-20-171

(1) Retail Stock. Upon receipt of this TB all items listed in paragraph 7 below shall be placed in condition code

//J// and retagged with a DD Form 1575 (brown tag) for in stock items in suspended status awaiting inspection. (Mark

suspended in accordance with this TB.) The authority block must reference inspection required per this TB. Items

identified as serviceable IAW paragraph 9 shall be retagged with a serviceable tag/label material DD Form 1574/1574-1

(yellow color). Indicate compliance with this TB in the remarks block. Items identified as discrepant IAW paragraph 9

below will be retagged with unserviceable (condemned) tag/label DD Form 1577 (red color). Annotate remarks block to

indicate that the item is unserviceable IAW this TB. Discrepant items will be disposed of IAW paragraph 10d.

(2) Wholesale Stock. Upon receipt of this TB, depot commanders shall ensure inspection of all items listed in

paragraph 7. All items listed in paragraph 7 below shall be placed in condition code //J// and retagged with a DD Form

1575 (brown tag) for in stock items in suspended status awaiting inspection. (Mark suspended in accordance with this

TB.) The authority block must reference inspection required per this TB.

2. Task/Inspection Suspense Date. Date is within 100 flight hours from receipt of superseded message or receipt of

this TB, whichever is received first.

3. Reporting Compliance Suspense Date. No later than 26 January 1996 per paragraph 14a of this TB.

4. Summary of Problem.

Aviation safety action message required an inspection for non-standard main rotor shaft nut bolts. This

TB revises the inspection interval from 10 hours/14 days to 100 flight hours, provides clarification of acceptable bolt

markings, and required maintenance procedures.

For manpower/downtime and funding impacts see paragraph 12.

The purpose of this TB is to annotate on DA Form 2408-13 that an inspection and removal of suspect

mast nut bolts is required within the next 100 flight hours.

5. End Items To Be Inspected. All H-60 Blackhawk aircraft. Inspection is not required if aircraft did not have these

main shaft nut bolts removed/replaced after delivery of the aircraft from Sikorsky Aircraft. If it is unknown whether the

shaft nut bolts were removed/replaced, the inspection shall be performed.

6. Assembly Components To Be Inspected. N/A.

7. Parts To Be Inspected.

NOMENCLATURE

PART NUMBER

NSN

MAIN ROTOR SHAFT NUT BOLT

S6110-21085-004