Maintenance Platforms/Workstands - TM-1-1520-265-23

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 2.20.3.3 Access. Not applicable. WARNING Maintenance Platforms/Workstands Use only appropriate platforms, workstands, or other approved locally procured stands and restraint equipment when working above 10 feet on helicopters in a nontactical environment. Otherwise, personnel injury could result from accidental falls. 2.20.3.4 Preparation of Part. The main rotor blades shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4. 2.20.3.5 NDI Equipment Settings. Refer to Bond Test Equipment, paragraph 1.4.6.1. a. Attach cable and probe to Bondmaster. Protect probe with Teflon tape and install in probe holder. b. Turn on Bondmaster, press SPCL, and make the following adjustments: H Pos - 40% V Pos - 80% PHASE REF - O DRIVE - MID c. Press SET and select DISPLAY PHASE. d. Place probe on the good area of test blocks and press GOOD PART. Do this several times while moving the probe to different spots in the good area of the standard. Note the video signature for each. Select and enter a representative good area by pressing GOOD PART one last time. e. Place probe on void area of test block and press BAD PART. Do this several times while moving the probe slightly to different positions within the void area. Select and enter a position that gives a strong difference between good and void areas. Use DIFF soft key to observe difference between good and bad areas of test block. NOTE If, during setup, the flying spot deflects upward or to the side when the probe passes over the bad part instead of the desired down deflection toward the alarm box, press SPCL and toggle to a different phase setting (90, 180, or 270), and repeat steps d. and e. Continue to try phase setting until the flying spot moves in the desired down direction. f. Place probe on good area of test block and press RUN. Flying spot should be near the top-center of the ACTIVE screen. If not, press NULL. Slide probe from good to void area and note response from flying spot. This response should provide both amplitude (vertical) and phase (horizontal) movement. The default gate/alarm setting may be incorrect for this set-up. Turn off or reset gate/alarm as desired. 2-47

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