Parts to be Inspected. - TB-1-1520-237-20-2250003

TB 1--1520--237--20--225

For manpower/downtime and funding impacts see para 12.

The purpose of this TB is to:

(1) Establish an initial and recurring check of the main landing gear drag beam jackpad bolthole

area for cracks.

(2) Inspect the drag beam, reduce the torque required on the main landing gear drag beam jack-

pad retention nut, and apply a torque stripe to the retention nut.

(3) Update the appropriate technical manuals to reflect the maintenance inspection and opera-

tional changes required IAW this message

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

Assembly Components to be Inspected. N/A

Parts to be Inspected.

NOMENCLATURE

PART NUMBER

NSN

Drag Beam/Axle Assy

70250--12105--043

1620--01--207--7482

Drag Beam/Axle Assy

70250--10257--043

1620--01--113--8134

Drag Beam/Axle Assy

70250--10257--045

1620--01--113--0816

Drag Beam/Axle Assy

70250--10257--046

1620--01--113--0187

Drag Beam/Axle Assy

70250--10257--047

1620--01--157--6482

Drag Beam/Axle Assy

70250--10257--049

1620--01--148--8972

Inspection Procedures..

NOTE

If cracks are found in the drag beam, minimize ground handling of the aircraft.

a. Prior to beginning the initial inspection of the drag beam/axle assembly, determine the availability

of items listed in paragraph 10a of this message. Availability of these items will determine the procedures

to be followed during the initial inspection of each main landing gear drag beam assembly.

(1) If the items in paragraph 10a are not available:

(a) Wipe clean the top and bottom of left and right main landing gear drag beams within 2

inch radius of drag beam jackpad bolt/tie down.

NOTE

Use only a non--metallic scrapper when removing sealant from around the jackpad bolt, washers

and nut.

(b) Remove sealant as applicable, from the jackpad retention nut and upper surface of the

drag beam IAW TM 1--1520--237--23, para 3--4--5.1.1, and TM 1--1520--250--23, para 3.1.6.1.

suspected, proceed to paragraph 8c.

NOTE

No cracks allowed.

(d) If no cracks are found, restrain the jackpad and rotate the retention nut (MS21245L12)

counterclockwise to release the torque on the nut.

NOTE

Do not remove the nut from the jackpad bolt.