TB 1--1520--237--20--227
b. For manpower/downtime and funding impacts see para 12.
c.
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
5.
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.
(c) Check for cracks radiating from the jackpad bolt/tie down holes. If a crack is found or
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.
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