TM 1-1520-240-MTF4-14f. Shut down ac and hydraulic power. Pick uptools and clean area. Close tunnel covers.2. Looseness Check Tolerances. The followingtolerances apply to looseness check.a. Bearings with radial looseness in excess of0.007 inch must be replaced.b. If each bearing in a series of bearings, hasless than 0.007 inch radial looseness, butoverall system looseness is in excess of3/8-inch, all or a portion of these bearingsmust be replaced to reduce looseness towithin the 3/8-inch overall loosenesstolerance.3. Check for control system looseness at forwardupper control as follows:a. Apply a manual force of about 10 pounds upand down to connecting link attaching pointsof right and left bell cranks. (Refer to TM55-1520-240-23, Ch. 11.)b. Measure distance that either bellcrank endmoves. If a bellcrank moves more than 3/8inch, there is excess looseness in thisportion of the control system.c. Isolate the cause of excess looseness.(Refer to TM 55-1520-240-23, Ch. 11.)4. Check for control system looseness at the aftupper control as follows:a. Apply force of about 10 pounds up and downto link attaching points of right and left pylonupper bellcranks.(Refer to TM55-1520-240-23, Ch. 11.)
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