Summary of Problem. - TB-1-1520-237-20-2130002

TB 1-1520-237-20-213

e. Maintenance Trainers. (Category A and B). Same as paragraph 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. Within next 10 flight hours/14days.

3. Reporting Compliance Suspense Date. No later than 18 August 1999 per paragraph 14.a of this

TB.

4. Summary of Problem.

a. There have been several instances of failure and subsequent fuel leakage from the P/N 70307-

03006-103 breakaway valve installed on the number two crossfeed line. Analysis of failed and non-failed

values revealed that the valve on this line is subject to bending forces generated during installation and

aggravated by the cyclic hydraulic pounding when the boost pump is turned on. Due to installation

differences, the valve on the number one line does not experience the same fatiguing forces. Until a

permanent fix that eliminates the installation bending moments is fielded, a time change schedule for this

valve on this crossfeed line must be established.

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

The purpose of this TB is to:

(1)

Accomplish a one time inspection of the number two crossfeed fuel line breakaway valve;

(2)

Implement a replacement schedule of the number two crossfeed fuel line breakaway valve;

(3)

Revise the installation and removal procedures in the technical manuals;

(4)

And establish a finite life of 1500 hours for valves installed on the number two crossfeed

line.

5. End Items to be inspected. All H-60 Aircraft.

6. Assembly Components to be inspected. N/A

7. Parts to be inspected.

Nomenclature

Part No.

NSN

Valve, self-sealing

70307-03006-103

NOTE

Only the valve installed on the number two crossfeed line (right side) is affected

by this TB.

8. Inspection Procedures.

a. Inspect the six month maintenance file to see if any breakaway valve on the number two crossfeed

line has been replaced. Determine the number of hours that the breakaway valve on the number

two crossfeed line has been in service. If there is no record of replacing the valve, use the aircraft

hours.