Summary of Problem. - TB-1-1520-237-20-2450002

TB 1-1520-237-20-245

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. N/A.

Components/Parts in Work (Depot Level and Others). N/A.

2. Task/Inspection Suspense Date. Complete the inspection IAW paragraph 8 before completion of next

PMS-2 but NLT 15 February, 2005.

3. Reporting Compliance Suspense Date. Report compliance IAW paragraph 14.a.(1) NLT 20 Febru-

ary 2002.

Summary of Problem.

a. H-60 series helicopters have a history of electrical arcing and shorted micro--switches in the Engine

PCL Quadrant wiring resulting from the PCL wiring chaffing on the PCL Quadrant housing as the pilot moves

the PCL's from idle to fly or fly to idle. A manual change was issued to reduce the potential for wiring chaffing,

detailing procedures to rectify the problem. Subsequent engineering evaluation has resulted in an improved

configuration of the PCL Quadrant wiring, which provides greater security and stability of the wiring harness.

Sikorsky has recently incorporated this improvement on production aircraft (SN 00-26868 and subsequent).

b. Manpower/downtime and funding impacts -- See paragraph 12.

c. The purpose of this TB is to provide corrective procedures that will eliminate the wiring chaffing on

the PCL quadrant housing for aircraft with SN prior to 00-26868.

End Items to be inspected. All H-60 series aircraft.

Assembly Components to be Inspected.

NOMENCLATURE

PART NUMBER

NSN

Quadrant Assembly, No. 1

70301-01033-043

1680-01-123-2555

Quadrant Assembly, No. 2

70301-01033-044

1680-01-123-2539

Quadrant Assembly, No. 1

70301-85033-043

1680-01-242-9185

Quadrant Assembly, No. 2

70301-85033-044

1680-01-242-9186

Quadrant Assembly, No. 1

70301-01033-041

1680-01-095-7261

Quadrant Assembly, No. 1

70301-01033-045

1680-01-242-9185

Quadrant Assembly, No. 2

70301-01033-042

1680-01-095-7262

Quadrant Assembly, No. 2

70301-01033-046

1680-01-242-9186

Parts to be Inspected. N/A.

Inspection Procedures.

NOTE

Aircraft with serial number "00-26868" and subsequent have been modified by Sikorsky Aircraft

Corporation.

a. If aircraft serial number is "00-26868" or subsequent, no additional inspection is required. The Red

Horizontal Dash / / - / / entry from paragraph 1.a. will be cleared and compliance noted on DA Form 2408-15.

b. If aircraft serial number is prior to "00-26868", proceed to paragraph 9.

Correction Procedures.

a. Remove the #1 and #2 Engine Power Quadrant Assembly IAW TM 1-1520-237-23-3, paragraph

4-4-21, or TM 1-1520-250-23-3, paragraph 4.13.