Helicopter GSE - Modular Aircraft Hydraulic Test Unit (MACHTU) and Multi-Function Aircraft Ground Power Unit (MFAGPU)

​In the demanding realm of aviation MRO (maintenance, repair, overhaul), the efficiency and reliability of ground support equipment (GSE) are paramount. Hydraulics International, Inc. (HII) has been at the forefront of developing advanced GSE solutions, notably the Modular Aircraft Hydraulic Test Unit (MACH-TU)  ( Part number: 091366-100 or 170621-100 )and the Multi-Function Aircraft Ground Power Unit (MFAGPU part number 081676-100). These units are engineered to streamline maintenance operations for a diverse range of aircraft, particularly helicopters. This article delves into the technical specifications, functionalities, and applications of these units, highlighting their significance in modern aviation maintenance.​

Helicopter GSE - Modular Aircraft Hydraulic Test Unit (MACH-TU)

The MACH-TU is a versatile hydraulic test unit designed to support various helicopter models, including the AH-64 Apache, CH-47 Chinook, UH-60 Black Hawk, and others. Its design consolidates multiple ground support functions into a single, deployable unit, enhancing operational efficiency.​

Key Features and Specifications

• Hydraulic Power Supply: The MACH-TU delivers hydraulic flow rates ranging from 0 to 15 gallons per minute (GPM) at pressures between 250 to 3,500 pounds per square inch (PSI) for helicopter gse. This flexibility allows it to accommodate the hydraulic system requirements of different aircraft.​

• Hydraulic Purification System: Integrated within the unit, this system ensures the removal of contaminants from hydraulic fluids. It effectively reduces water content from 1,000 to less than 200 parts per million (PPM), chlorinated solvents from 400 to under 100 PPM, and achieves particulate cleanliness levels equal to or better than NAS 1638 class 3.​

  

  
  

  Power Generation:

  • AC Power: Provides 115/200 volts alternating current (VAC), 3-phase, 400 Hz power with a capacity of 60 kilovolt-amperes (KVA), supporting various aircraft electrical systems.

  • DC Power: Offers 28 volts direct current (VDC) with a continuous output of 300 amps and a peak of 1,000 amps for 30 seconds, suitable for starting aircraft engines and powering onboard systems.

• Pneumatic System: Includes an Integrated Pressurized Air System (IPAS) supplying 8 cubic feet per minute (CFM) at 50 PSI, essential for tasks such as avionics cooling and pneumatic tool operation.​

• Nitrogen System: Equipped to provide high-pressure nitrogen for servicing aircraft systems like landing gear struts and tire inflation.

• Lighting: Features tower lighting to illuminate work areas during night operations or low-visibility conditions, enhancing safety and efficiency.​

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Applications and Benefits

The MACH-TU's comprehensive capabilities make it an invaluable asset for military and civilian maintenance operations. Its ability to replace multiple pieces of ground support equipment reduces logistical complexity and operational costs. For instance, during field operations, the MACH-TU enables maintenance crews to perform a wide range of servicing tasks without the need for multiple specialized units, thereby enhancing readiness and response times.​

Helicopter GSE - Multi-Function Aircraft Ground Power Unit (MFAGPU)

The MFAGPU is an all-in-one ground power solution designed to support aircraft with both start air and DC power requirements. It is particularly effective for helicopters such as the AH-64 Apache and KUH-1 Surion.​

Key Features and Specifications

• Electrical Power Supply:

  • AC Power: Delivers 63 KVA at 120/208 VAC, 3-phase, 400 Hz, accommodating a wide range of aircraft electrical systems.

  • DC Power: Provides 28 VDC with a continuous output of 300 amps and a peak of 1,000 amps for 30 seconds, essential for engine starts and system checks.​

• Hydraulic Power Supply: Offers dual output with 20 GPM at pressures ranging from 500 to 3,500 PSI, supporting both open and closed-loop hydraulic systems.

• Hydraulic Fluid Purification: Incorporates a purification system that continuously monitors contamination levels, ensuring hydraulic fluid integrity and prolonging component lifespan.

• Pneumatic Power: Capable of delivering 30 pounds per minute (lb/min) (400 CFM) at 40 PSI for air starts, and 8 CFM at 50 PSI for IPAS requirements, facilitating engine starts and other pneumatic operations.​

• User Interface: Features a computer-controlled system with a touchscreen interface, providing operators with intuitive control and real-time monitoring of all functions.​

• Mobility: Trailer-mounted design allows for towing at speeds up to 55 mph over improved roads, ensuring rapid deployment and repositioning as needed.

Applications and Benefits for MRO shops

The MFAGPU's multifunctionality is particularly beneficial in environments where space and resources are limited. By consolidating electrical, hydraulic, and pneumatic power supplies into a single unit, it simplifies ground support operations and reduces the equipment footprint. This integration is especially advantageous for expeditionary forces and remote operations, where logistical efficiency is critical.​

Comparative Analysis

Both the MACH-TU and MFAGPU are engineered to enhance the efficiency of aircraft maintenance operations by integrating multiple support functions into single units. While they share several capabilities, their design focuses cater to different operational needs:​

• MACH-TU: Emphasizes comprehensive hydraulic testing and servicing, making it ideal for maintenance scenarios requiring extensive hydraulic system diagnostics and purification.​

• MFAGPU: Offers a balanced suite of electrical, hydraulic, and pneumatic power supplies, suited for operations needing versatile support for engine starts and system checks across various aircraft types.​

The choice between the two units depends on the specific requirements of the maintenance operation, including the types of aircraft serviced, the nature of maintenance tasks, and logistical considerations.​

MULTI FUNCTION AIRCRAFT GROUND POWER UNIT (MFAGPU)

FOR

AH-64/CH-47/UH-60/UH-61/S-70/S-72/S-92/OH-58/AH-1/EC-725

All-in-One unit (P/N: 081676-100)

Conclusion

The MACH-TU and MFAGPU represent significant advancements in helicopter ground support equipment, reflecting HII's commitment to innovation and operational excellence in aviation maintenance. By integrating multiple support functions into single, deployable units, they address the evolving needs of both military and civilian aviation sectors. Their deployment