TB 1-1520-237-20-212
g. Component/Parts In Work (Depot Levels and Others). N/A.
Task/Inspection Suspense Date. Within next 20 flight hours/ 30 days whichever occurs first.
2.
3.
Summary of the Problem.
4.
a. TB 1-1520-237-20-181 and TB 1-1520-250-20-6 (UH-60-97-ASAM-01) imposed a visual in-
spection for an edge break (deburred) condition and fluorescent penetrant inspection (FPI) for cracks on the
inside surface of the hub where the eleven o'clock dampner bracket attaching bolt extrudes through the interi-
or surface. Recently a hub, that had been previously inspected, was found to have a crack in the same loca-
tion in a more critical direction, during a subsequent inspection when using more aggressive non-destructive
inspection (NDI) techniques which are reflected in paragraph 8. The UH PMO is pursuing a long term fix that
will eliminate the need for the recurring inspection required by this ASAM.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to implement a recurring inspection of P/N 70103-08112-041/-045 Main
Rotor Hub Assembly for cracks in specified areas. This TB supercedes the paragraph 9.d. inspection of TB
1-1520-237-20-181 and TB 1-1520-250-20-6 (UH-60-97-ASAM-01). This TB does not apply to the
70103-08112-047 Rotary Hub Assembly.
End Items to be Inspected. All H-60 aircraft.
5.
6.
Assembly Components to be Inspected.
PART NUMBER
NOMENCLATURE
NATIONAL STOCK NUMBER
Hub, Rotor, Assembly
70103-08112-041
Hub, Rotor, Assembly
70103-081112-045
(MH-60)
7.
Parts to be Inspected. N/A.
8.
lnspection Procedures.
a. Inspect the aircraft time change DA Form 2408-16 for the paragraph 6 assembly. If a P/N
70103-08112-047 Main Rotor Hub is installed the inspection is complete.
b. If the Main Rotor Hub time since new (TSN) is less than 1,000 hours, annotate the DA Form
2408-5-1 for the Main Rotor hub and schedule the inspection on the DA Form 2408-18 to accomplish the
inspection IAW paragraph 8.e. or 8.f. (as appropriate) at each subsequent PMS II phase inspection up to
1,000 hours TSN. Upon reaching 1,000 hours; TSN, perform the inspection IAW paragraph 8.e. or 8.f. (as
appropriate) at each schedule 100 hour special inspection.
c. If the Main Rotor Hub TSN is more than 1,000 hours and it has been less than 100 hours since the
last Main Rotor Hub NDI inspection (reference paragraph 4.8.) was performed, annotate the DA Form
2408-5-1 for the Main Rotor Hub and schedule the inspection on the DA Form 2408-18 to accomplish the
inspection IAW paragraph 8-e. or 8.f. (as appropriate) at the next scheduled 100 hour special inspection and
every 100 hour special inspection thereafter. Under no circumstance will the time between the last NDI per
TB 1-15120-237-20-181 and TM 1-1520-237-20-6 (UH-60-ASAM-01) and the first recurring inspection
per this ASAM than 150 hours.
d. If the Main Rotor Hub TSN is more than 1,000 hours and it has been 100 hours or more since the
last Main Rotor Hub NDI inspection (reference paragraph 4.a.) was performed, or no NDI inspection has been
perform, perform the inspection IAW paragraph 8.e. or 8.f. (as appropriate). Annotate the DA Form 2408-5-1
for the Main Rotor Hub and schedule the inspection on the DA Form 2408-18 to accomplish the inspection
IAW paragraph 8.e. or 8.f. (as appropriate) at the next scheduled 100 hour special inspection and every 100
hour special inspection thereafter.
e. Eddy Current Inspection,
2
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