TB 1-1520-240-20-118
(1) Surface/Air Shipment. Inspect prior to first flight.
(2) Ferry Status. Same as paragraph 1a. Those aircraft that have a DD 250 and are at Boeing
Helicopter will be inspected prior to ferry to final destination.
e.
Maintenance Trainers (Category A and B). Same as paragraph 1a.
f.
Component/Parts in Stock at All Levels (Depot and Others) including War Reserves. N/A.
(1) Wholesale Stock. N/A.
(2) Retail Stock. N/A.
g. Components/Parts in Work (Depot Level and Others). Items listed in paragraph 6 in work will not
be issued until compliance with paragraph 9 of this Technical Bulletin.
2. Task/Inspection Suspense Date. At the next daily inspection but no later than 25 May 2000 and report
in accordance with paragraph 14b.
3. Reporting Compliance Suspense Date. Report compliance in accordance with paragraph 14a no later
than 2 June 2000.
4.
Summary of the Problem.
a. During post flight inspection a horizontal hinge pin shouldered bolt, P/N 114R2201--1, was found to
have the bolt head separated. Failure analysis determined a crack had initiated at the groove between the
shank and the head of the bolt. The crack propagated until the bolt head broke off. A redesigned bolt, P/N
114R2201--2, which does not have a groove is now being procured.
b.
For manpower/downtime and funding impacts see paragraph 12.
c. The purpose of this Technical Bulletin is to direct the initial inspection of each P/N 114R2201--1 bolt,
and direct a recurring inspection to be performed during each scheduled daily inspection, preflight inspection,
and postflight inspection. Replacement of the P/N 114R2201--1 bolt is required at each 1200 hour horizontal
hinge pin rotation or at any unscheduled maintenance requiring horizontal hinge pin removal.
5.
End Items to be inspected . All CH--47D, MH--47D, and MH--47E Aircraft.
6.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
Head, Rotary Wing, FWD
145R2003 -- All
Head, Rotary wing, AFT
145R2004 -- All
7.
Parts to be Inspected .
PART NUMBER
NATIONAL STOCK NUMBER
NOMENCLATURE
Bolt
114R2201 -- 1
5306--00--843--7117
8.
Inspection Procedures.
NOTE
If bolt, P/N 114R2201--2, is installed, it does not require this special daily
inspection and is covered by existing daily inspection of rotor head.
NOTE
On initial inspection bolt heads may be covered with adhesive (RTV
730). The bolt may appear to be secure when it is being held by the
adhesive. If the bolt head is completely covered remove the adhesive
using a plastic scraper before performing the inspection in paragraph 8a,
below. Following the initial inspection re--apply adhesive with a thin bead
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