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Altitude Hover and Hold System (AHHS) Description In 1997, the U.S. Air Force awarded a contract to manufacture and test the Altitude Hover and Hold Stabilization System (AHHS). The unit is a retrofit system that will permit the pilot of the MH-60G helicopter to AUTOMATICALLY hover the helicopter over a point at a set altitude. The system also monitors and displays several operating parameters for the pilot. The AHHS system is VERY complex and consists of several multi-layer PCBs, accelerometers, and servos. Some of the PCB’s are 4-5 layers. The mechanical requirements of the system are also very complex. Some of the Disan fabricated cases (folded from aluminum sheet metal) are approximately 18 inches long and have finished tolerances of + 0.010 inches.
To test the AHHS, Disan engineers were required to design many pieces of specialized test fixtures. To adequately test a system requires several man-days of engineering time and requires the use of sophisticated test equipment. Disan is presently one of only two companies approved by the Air Force to produce these units.
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