TB 1--1520--237--20--237
d. Maintenance Trainers (Category A, and B). Same as paragraph 1.a..
e. Component/Parts in Stock at All Levels (Depot Level and Others), including War Reserves. Upon
receipt of this TB, Depot and Materiel Activity Commanders will ensure the materiel condition tags of all items
in all condition codes listed in paragraph 6 are annotated to read "TB 1-1520-237-20-237 Main Rotor Subas-
sembly Rework not complied with".
(1) Wholesale Stock - N/A.
(2) Retail Stock -- Report receipt of this TB IAW 14.c.(1) NLT 14 December, 2001. Upon receipt
of this TB, Commanders and Facility managers maintaining retail stock at installation level and below shall
contact the supported aviation unit to perform the procedures required in paragraph 8. on items in paragraph
6. .
Report compliance with this TB
IAW paragraph 14.c.(2) NLT 21
December, 2001.
f.
Components/Parts in Work (Depot Level and Others). N/A.
2. Task/Inspection Suspense Date. Complete the inspection IAW paragraph 8.b. within the next 10
flight
hours but NLT 21 December, 2001and report IAW para 14.a.(2).
3. TAMMS Reporting Compliance Suspense Date.
Report compliance IAW paragraph 14.a.(1), NLT
14 December 2001.
4.
Summary of Problem.
a. History - UH-60-01 (TB 1-1520-237-20-235) was issued 23 August, 2001 to notify the field that hubs
with part numbers 70103-08112-047/ -048/ -049/ -050 and 70070-10046-055/ -056 have been redesigned
or reworked to eliminate the feature that makes them susceptible to cracking at the 11 O'Clock bolt hole. That
SOF also reduced the 200 hour recurring non-destructive inspection (NDI) inspection established by TB
1--1520-237-20-215 (UH-60-00-ASAM-01), to every 100 hours, and implemented a before the first flight of
the day visual inspection of the hub near the 11 O'Clock bolt hole.
c.
The purpose of this TB is to:
(1) Identify all main rotor head hubs that qualify for the hub modification program at Sikorsky Air-
craft.
(2) Establish a rotable pool to provide replacement hubs for those which qualify for modification/
rework.
(3) Identify changes to the Technical Manuals as a result of this configuration change.
End Items to be inspected. All H-60 aircraft.
Assembly Components to be Inspected. -
PART NUMBER
NSN
NOMENCLATURE
Hub, Rotor Assembly
70103-08112-041
Hub, and Liner, Rotor Assembly
70103-08112-042
Hub, Rotor Assembly
70103-08112-045
(MH-60K)
Hub, and Liner, Rotor Assembly
70103-08112-046
(MH-60K)
7.
Parts to be Inspected. - N/A.
2