TB 1--1520--237-20--243
Inspection Procedures.
a. Using 1X to 2X magnification, inspect the surface of the aluminum cam handle immediately adjacent
(within one quarter of an inch) to the pivot pin in the cam handle, both sides of the handle, as follows:
(1) Check for any visible deformation of the cam handle material surface that gives the appear-
ance of an out-of-round condition of the countersunk area in the handle, off-center staking of the pin, or multi-
ple staking of the pin.
NOTE
Supplemental information regarding the particular manufacturing anomaly described above is
available on the AMCOM Safety website "http://www.redstone.army.mil/sof/suppl/u60s0205.pdf"
and the safety message section of the UH-60 KAMNET (http://www.uhpo.redstone.army.mil).
(2) If the material surface deformation is found, proceed to paragraph 9.a..
b. Check main rotor blade expandable pin for security and tension as follows:
NOTE
There must not be any binding of the expandable pin by the main rotor blade when the tension
is checked. The main rotor blades and blade pins do not have to be removed for this inspection.
(1) Using proper procedures, carefully raise the main rotor blade to remove any binding of the
expandable blade pins.
(2) Release expandable pin handle from the lower nut and open handle.
(3) Pull the pin out far enough for the top two expandable segments to be visible above the blade
cuff. Verify that the pin is not fractured by observing the corresponding movement of the lower end of the
core pin. Do not completely remove the pin.
(4) If the pin is not defective, re-install and check the closing tension on the handle as follows:
(a) Using spring scale, place end of spring scale in the handle nut hole and pull down in a
closing direction.
(b) Keeping the spring force perpendicular to the long, riveted section of the handle, the force
required to close handle must be a minimum of 25 pounds.
NOTE
If the force required to close the handle is exceptionally high (difficult to close handle), check for
binding of the pin by the main rotor blade. Reducing the nut torque to reduce the closing force
should not be necessary.
(c) If force is 25 pounds or above, close and secure handle. Ensure that at least two threads
extend beyond the nut. The inspection is complete.
(d) If force is not at least 25 pounds, tighten nut. Rotate nut 1/6 (one sixth) turn and re-check
closing force. Repeat until minimum of 25 pounds closing force is obtained. Ensure that at least two
threads extend beyond nut after proper requirements are met. If a minimum of two threads are not ex-
posed, clean the expandable pin according to paragraph 1-4-6 of TM 1-1520-237-23-1, or paragraph
1.39.5 of TM 1-1520-250-23-1. After cleaning, repeat the tension test according to paragraph 8.b.(4).
(5) If inspection criteria is not met, proceed to paragraph 9.b..
c. Implement a recurring 30 hour inspection IAW paragraph 8.b.. ULLS-A units will use inspection
number A65 for the recurring 30 hour expandable pin inspection. Following the initial inspection, this recurring
30 hour inspection will be part of the scheduled 30 hour special inspection.
NOTE
During the PMS-1 inspections the only requirement is to open and close the handle verifying resist-
ance during closing, see paragraph 12 for changes to PMS-1 blade pin inspection. Lifting the blade
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