Summary of the Problem. - TB-1-1520-237-20-2240002

TB 1--1520--237--20--224

d. Aircraft in transit.

(1) Surface/air shipment. Same as para 1a.

(2) Ferry status.

(a) Same as para 1a.

(b) Sikorsky will inspect DD Form 250 aircraft prior to those aircraft departing for ferry to final

destination.

e. Maintenance trainers (Category A and B). Same as para 1a.

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 within the next 10 flight

hours but NLT 15 September 2000 and report IAW para 14b.

Reporting Compliance Suspense Date. Report compliance IAW para 14a NLT 22 September 2000.

Summary of the Problem.

a. Several field units have reported finding chafing and burn marks on two adjacent AC electrical power

wire harnesses that run from the No. 1 junction box to the No. 2 junction box. The burn marks were the result

of electrical arcing caused by chafing of the wire shielding. The chafing was the result of the harnesses being

installed without a required mounting plate (wire saddle) during replacement of the Kapton Wiring. Replace-

ment of the Kapton Wiring was accomplished as part of the refurbishment program (MWO

1--1520--237--55--7).

b. For manpower/downtime and funding impacts see para 12.

The purpose of this TB is to:

(1) Inspect all suspect aircraft for evidence of chafing and burn marks on the wire harness and

relay panels.

(2) Repair any damage that is found.

(3) Ensure the required mounting plate is installed to prevent future damage.

5. End Items to be inspected. UH--60A aircraft serial number 77--22720 through 82--23746 that have

been refurbished.

Assembly Components to be Inspected. N/A

Parts to be Inspected.

NOMENCLATURE

PART NUMBER

NSN

Wire Harness

70552--02109--065

N/A

Wire Harness

70552--02109--066

N/A

Mounting Plates

TC--92

5340--00--728--1389

Left Hand Relay Panel

70552--02105--043

5945--01--101--4073

70552--02105--045

5345--01--108--3512

70552--02105--048

5945--01--129--7331

70552--02105--050

5945--01--129--7331

70552--02105--051

5945--01--221--0478

70552--02105--054

5945--01--289--2695