Hydraulic systems in aircraft provide a means for the operation of aircraft components. The operation of landing gear, flaps, flight control surfaces, and brakes is largely accomplished with hydraulic power systems. Hydraulic system complexity varies from small aircraft that require fluid only for manual operation of the wheel brakes to large transport aircraft where the systems are large and complex

Hydraulic systems are used on aircraft to move and actuate landing gear, flaps and brakes. Larger aircraft use these systems also on flight controls, spoilers, thrust reversers and what not.

Global Air Services has the capabilities to inspect, repair & overhaul individual hydraulic components as well as complete hydraulic assemblies. Our in house testing facility allows Global Air Services to provide a turnkey repair/overhaul process which reduces turn time and overall cost for our customers. Global Air Services has the capabilities to repair/overhaul hydraulic pump and motor repairs on Kawasaki®, Bosch Rexroth®, John Deere® (Hitachi), Caterpillar®, Uchida®, Linde®, Komatsu®, Kobelco®, Sauer Sundstrand®, Denison® & more.


Cylindrical accumulators consist of a cylinder and piston assembly. End caps are attached to both ends of the cylinder. The internal piston separates the fluid and air/nitrogen chambers. The end caps and piston are sealed with gaskets and packings to prevent external leakage around the end caps and internal leakage between the chambers. In one end cap, a hydraulic fitting is used to attach the fluid chamber to the hydraulic system. In the other end cap, a filler valve is installed to perform the same function as the filler valve installed in the spherical accumulator



Some aircraft manufacturers have equipped their aircraft with a high pressure pneumatic system (3,000 psi) in the past. The last aircraft to utilize this type of system was the Fokker F27. Such systems operate a great deal like hydraulic systems, except they employ air instead of a liquid for transmitting power. Pneumatic systems are sometimes used for:

• Brakes

• Opening and closing doors

• Driving hydraulic pumps, alternators, starters, water injection pumps, etc.

• Operating emergency devices.

Skydrol fluids are phosphate ester-based fluids blended with performance additives. Phosphate esters are good solvents and dissolve away some of the fatty materials of the skin.

Global Air Services is a specialist in the repair and overhaul of pneumatic and fuel components for aircraft manufactured by Boeing, Airbus, Embraer, Bombardier, ATR, Bell, AgustaWestland and many others. To meet the quality requirements of the aviation industry, our advanced suite of equipment, test stands and vacuum chambers, allow us to diagnose and repair pneumatic systems to the standards established by OEM.


Pneumatic systems are often compared to hydraulic systems, but such comparisons can only hold true in general terms. Pneumatic systems do not utilize reservoirs, hand pumps, accumulators, regulators, or engine-driven or electrically driven power pumps for building normal pressure. But similarities do exist in some components. On some aircraft, permanently installed air compressors have been added to recharge air bottles whenever pressure is used for operating a unit. Several types of compressors are used for this purpose. Some have two stages of compression, while others have three, depending on the maximum desired operating pressure.



combines electrical and mechanical processes and procedures drawn from electrical engineering and mechanical engineering. Electrical engineering in this context also encompasses electronics engineering. Devices which carry out electrical operations by using moving parts are known as electromechanical.

Virtually all aircraft contain some form of an electrical system. The most basic aircraft must produce electricity for operation of the engine’s ignition system.

For high precision applications we have a family of standard actuators featuring rare-earth brushless servomotors, integral planetary gears and smart servo controllers with integral position control.  For simpler utility applications we have a family of actuators featuring DC motors, spur gears analog amplifiers and external position control. Our highly trained and experienced staff provides technical advice, troubleshooting support and safe solutions to ensure seamless operations of the aircraft electro-mechanical system and equipment.


During processing, it is imperative that FAA personnel with knowledge of the petition do not discuss the FAA’s decision until the decision document has been signed. A summary of each petition for exemption is normally published in the Federal Register (FR), and the public may submit comments to the FAA-assigned public docket. After the close of the public comment period, the FAA action office considers all comments received and decides whether to accept or deny the petition. The decision document is then prepared, coordinated, signed, and mailed to the petitioner.



Since certain electrical systems operate only on AC, many aircraft employ a completely AC electrical system, as well as a DC system. The typical AC system would include an AC alternator (generator), a regulating system for that alternator. The CSD can be an independent unit or mounted within the alternator housing. When the CSD and the alternator are contained within one unit, the assembly is known as an integrated drive generator (IDG).

Note that an AC alternator also produces a constant 400 Hz if that alternator is driven directly by an engine that rotates at a constant speed.

Our experience, cutting edge technology, and attention to detail have earned us the reputation to have the best repair capabilities for all narrow and wide body aircrafts included but not limited to Airbus, Boeing, Dash 8, ATR and EMBRAER.

Our team of specialized mechanics and engineers follows the strictest safety measures and testing to ensure our repairs and overhauls meet the requirements of the industry.  Extensive testing is conducted to provide our customers with the highest levels of reliability, safety and equipment durability. Global Air Services is very proud of the very high record on no returns units. Guaranteeing the most highest standards on the market.


The CSD is a hydraulic unit similar to an automatic transmission found in a modern automobile. The engine of the automobile can change rpm while the speed of the car remains constant. This is the same process that occurs for an aircraft AC alternator. If the aircraft engine changes speed, the alternator speed remains constant. A typical hydraulictype drive is shown in Figure 9-79. This unit can be controlled either electrically or mechanically. Modern aircraft employ an electronic system. The constant-speed drive enables the alternator to produce the same frequency at slightly above engine idle rpm as it does at maximum engine rpm.


We are incorporating new items to our capabilities list, every day. You can always ask us for a specific part that it is not in our list. We might work something out for you.



At Global Air Services you will always find a helpful and knowledgeable staff ready to assist you at your most critical moment. Our company has designed a program to prevent delays or mishaps with all work orders that we engage in. This program specifies on a reliable 24/7 A.O.G customer service, complimentary services on selected repairs and exchanges and more than a year in standard warranty just to name a few.

Great & Fast Services

Our commitment to the customer never ends. Our employees take the time, no matter what the hour to provide professional service and solutions.

High Quality Repair Products

Utilizing the repair station’s full range of maintenance and testing equipment ensures high-quality inspections, repairs, and overhauls.

Experienced Staff

Global Air Services proudly certifies their technicians to provide detailed analysis and extensive acceptance testing on all of their products.