TB 1--1520--237--20--263
d. Aircraft in Transit.
(1) Surface/Air Shipment. Prior to first flight at destination.
(2) Ferry Status.
(a) Same as 1a.
(b) Those aircraft that have a DD Form 250 and are at Sikorsky will be inspected prior to ferry
to final destination.
e. Maintenance Trainers (Category A, and B). Same as para 1a.
f.
Component/Parts in Stock at All Levels (Depot and Others), Including War Reserves. N/A.
g. Components/Parts in Work (Depot Level and Others). N/A
2.
Task/Inspection Suspense Date. Complete the inspection IAW paragraph 8 prior to
the next flight but
3.
Reporting Compliance Suspense Date.
Report compliance IAW para 14a NLT 1
August 2000.
4.
Summary of the Problem.
a. Background. During a routine periodic inspection, a main rotor blade spindle was found to have one
lug that fractured. The subsequent CAT I investigation is ongoing. In separate and unrelated incidents, two
main rotor blade expandable retention pins fractured. The investigation, to include fatigue testing of additional
pins, is continuing. The required inspection of the spindle lugs will exercise the pins sufficiently to identify
b. For manpower/downtime and funding impacts see para 12.
NOTE
This TB is a revision of TB 1-1520-237-20-221 (UH-60-00-01) as required by paragraph 1.2.3
of UH-60-03-02.
c.
The purpose of this TB is to:
(1) Rescind the requirement of TB 1-1520-237-20-221 (UH-06-00-01), for before the first flight
of the day inspection of main rotor spindle lugs.
(2) Perform an initial inspection of the main rotor spindles for broken lugs.
(3) Implement recurring inspections of the main rotor spindle lugs.
(4) Augment existing inspections of the expandable pins.
End Items to be inspected. All H--60 aircraft.
Assembly Components to be Inspected.
PART NUMBER
NSN
NOMENCLATURE
Spindle Assembly
70070--10030--042
1615--01--331--2480
Spindle Assembly
70070--10030--046
1615--01--249--4107
Spindle Assembly
70102--08200--044
1651--01--214--6602
Spindle Assembly
70102--08200--046
1615--01--295--1174
Spindle Assembly
70102--08200--051
N/A
Spindle Assembly
70102--08200--054
1615--01--372--9604
Spindle Assembly
70102--08200--056
1615--01--374--7203
Spindle Assembly
70102--08200--061
N/A
2