Boeing 747: Aircraft Axle Jacks

An aircraft axle jack is a specialized hydraulic lifting device used to raise and support an aircraft wheel or landing gear assembly during maintenance operations. Aircraft axle jacks provide controlled lifting power for tire changes, brake servicing, wheel inspections, shock strut maintenance, and other landing gear procedures that require safe access beneath the aircraft. Because landing gear systems support the full weight of the aircraft during taxi, takeoff, and landing, proper maintenance is critical for operational safety and reliability. Using the correct aircraft axle jack helps technicians perform these tasks efficiently while protecting both the aircraft structure and maintenance personnel.

An aircraft axle jack is positioned beneath the landing gear axle or approved lifting point and uses hydraulic pressure to raise the wheel assembly off the ground. Hydraulic fluid is pressurized through a hand pump or pneumatic-assisted system, extending the jack ram in a controlled manner to lift the aircraft safely and evenly. Once elevated, technicians can safely access tires, brakes, wheels, and struts for maintenance, inspections, and repairs. Most aircraft axle jacks also include mechanical locking devices, or safety collars, to help secure the load during maintenance.

Common types of aircraft axle jacks include hydraulic hand-pump axle jacks, pneumatic-assisted axle jacks, alligator jacks, fly-away jack systems, and rhino jacks. Standard hand-pump and pneumatic axle jacks are widely used for general maintenance and routine landing gear service across many aircraft types. Alligator jacks feature a wide, low-profile design for added stability on heavier aircraft, while fly-away jacks prioritize lightweight portability for field operations and AOG response. Rhino jacks are designed for high-capacity lifting applications involving larger commercial and military aircraft with substantial landing gear loads.

An alligator jack is a low-profile aircraft axle jack with a wide base and extended lifting arms that resemble an alligator’s jaws. Alligator jacks provide exceptional stability and are commonly used on larger aircraft or applications with limited ground clearance around the landing gear. Their broad footprint helps distribute loads more evenly during lifting operations, which is especially important during heavy aircraft maintenance. These aircraft axle jacks are frequently used in airline, cargo, and MRO environments where high-capacity lifting and durability are required.

A fly-away jack is a lightweight, portable aircraft axle jack designed for field maintenance, remote operations, and emergency servicing. These compact jack systems are commonly used on business jets, military aircraft, and general aviation aircraft, where portability and storage space are important considerations. Many fly-away jack kits are designed to fit inside the aircraft baggage compartment or maintenance support equipment package for rapid deployment during AOG situations. Despite their compact size, fly-away jacks still provide the controlled lifting capability needed for tire and brake maintenance in remote locations.

Rhino jacks are heavy-duty aircraft axle jacks designed for larger aircraft and demanding maintenance environments. Rhino jack systems are commonly used for line maintenance, hangar operations, and servicing aircraft with higher landing gear loads, including wide-body commercial aircraft and military platforms. Their reinforced construction and high lifting capacities make them suitable for repetitive use in high-volume maintenance facilities. Rhino jacks are engineered to provide stable lifting performance while handling the substantial weight associated with large transport aircraft.

Aircraft axle jacks are available in lifting capacities ranging from approximately 1.5 tons to more than 100 tons, depending on the aircraft application and jack design. Smaller axle jacks are commonly used on light general aviation aircraft, while larger alligator jacks and rhino jacks support commercial, cargo, and military aircraft maintenance. Selecting the proper capacity is critical because the jack must safely support the portion of the aircraft weight being lifted while maintaining a suitable safety margin. Always consult the Aircraft Maintenance Manual (AMM) and the jack manufacturer's specifications before performing any lifting operation.

Yes. Many aircraft axle jacks include adjustable height ranges, extension adapters, interchangeable saddles, and multiple pad configurations to accommodate different landing gear geometries and aircraft types. However, aircraft axle jacks are not universally compatible with every aircraft, and lifting requirements can vary significantly between models. The jack capacity, lifting height, jack pad configuration, and approved lifting points must all match the aircraft manufacturer’s specifications. Always verify compatibility through the aircraft’s AMM before using the same axle jack on multiple aircraft platforms.

Most aircraft axle jacks can be safely used outdoors when operated on stable, level surfaces such as concrete ramps or paved flight lines. Models with corrosion-resistant coatings, Skydrol-resistant finishes, and durable steel construction are especially well-suited for outdoor aviation environments. Weather exposure, uneven pavement, standing water, and high winds should always be considered before beginning any aircraft jacking operation outdoors. Proper storage and preventative maintenance also help protect hydraulic axle jacks from environmental wear and corrosion over time.

Modern aircraft axle jacks commonly feature overload relief valves, mechanical locking collars, safety stops, wide-base designs, and nonslip lifting saddles. These safety systems help stabilize the aircraft, maintain controlled lifting, and reduce the risk of accidental lowering during maintenance operations. Many aircraft axle jacks also include preset release valves and reinforced hydraulic seals to support safe hydraulic performance under load. Together, these features help improve both technician safety and aircraft protection during landing gear servicing procedures.

Aircraft axle jacks should be visually inspected before each use for hydraulic leaks, structural damage, worn seals, loose hardware, or other signs of wear that could affect lifting performance. Preventative maintenance inspections are typically performed on a scheduled basis according to the manufacturer’s recommendations and the operator’s maintenance program. Annual proof-load testing and hydraulic system evaluations are commonly performed to verify safe operating condition and load-handling capability. Regular inspection and maintenance help extend service life while ensuring the aircraft jack remains compliant and safe for continued use.

Aircraft axle jacks are commonly used for tire replacement, brake servicing, wheel bearing inspections, landing gear maintenance, shock strut servicing, wheel removal, and wheel well inspections. By lifting a specific landing gear assembly, axle jacks provide technicians with safe access to components that would otherwise be difficult to reach with the aircraft resting on its wheels. These aircraft jacks are essential tools in both routine line maintenance and more extensive scheduled inspections. Proper lifting equipment also improves maintenance efficiency and reduces downtime during servicing operations.

No. Aircraft axle jacks are specifically engineered for lifting landing gear assemblies at approved lifting points and should not be used for engines, fuselage sections, wings, or other aircraft structures. Using an axle jack improperly may damage the aircraft, overload the jack, or create unsafe working conditions for maintenance personnel. Different aircraft maintenance procedures require different categories of lifting and support equipment, including tripod jacks, tail stands, and specialized structural supports. Always follow the aircraft manufacturer’s approved lifting procedures and equipment requirements.

Common aircraft axle jack accessories include jack pads, extension adapters, tow handles, wheel dollies, trailer systems, and protective carrying cases. Jack pads and adapters help ensure proper contact between the aircraft lifting point and the jack saddle, while extensions allow the jack to accommodate different aircraft heights and landing gear geometries. Towbars, wheels, and trailer systems improve mobility across hangars and ramps, especially for larger alligator jacks and rhino jacks. These accessories help improve compatibility, efficiency, and ease of operation during aircraft maintenance procedures.

PJi offers aircraft axle jacks from trusted aviation manufacturers, including Tronair, Malabar, Columbus Jack, and Bogert Aviation. These brands are widely recognized throughout the aviation industry for producing reliable, high-quality aircraft jacking equipment for general aviation, business aviation, military, and commercial aircraft applications. PJi provides new, used, rental, and service options to support a wide range of maintenance requirements and operational budgets. Our aviation specialists can also assist with selecting the correct aircraft axle jack, adapter configuration, and lifting solution for your specific aircraft platform.

When choosing an aircraft axle jack, important considerations include lifting capacity, closed and extended height range, aircraft compatibility, portability, and available safety features. The jack must safely support the specific landing gear load while matching the aircraft’s approved lifting points and maintenance procedures. Operators should also evaluate whether accessories such as extension adapters, tow handles, or pneumatic pumps are needed for their maintenance environment. Choosing a properly sized, well-maintained aircraft axle jack helps improve safety, efficiency, and long-term equipment reliability.

Aircraft axle jacks should be load-tested in accordance with the manufacturer’s recommendations, regulatory requirements, and the operator’s maintenance program. Many aviation maintenance organizations perform annual proof-load testing to verify that the jack can safely support its rated lifting capacity without hydraulic leakage, structural deformation, or operational issues. Jacks used frequently in airline, MRO, or heavy maintenance environments may require more frequent inspections and testing due to increased wear and usage. Routine load testing helps ensure continued compliance, operational safety, and long-term reliability.

Choosing the right axle jack for your aircraft begins with identifying the aircraft make, model, landing gear configuration, and required lifting capacity outlined in the Aircraft Maintenance Manual (AMM). Technicians must confirm the approved lifting points, required lift height, and any necessary jack pads or adapters before selecting a jack. Factors such as portability, maintenance environment, and frequency of use should also be considered when evaluating different aircraft axle jack designs. Working with an experienced aviation GSE supplier can help ensure the selected jack is fully compatible with your aircraft and operational needs.