Boeing 737 jacks are specialized lifting devices used during maintenance, inspections, and component replacements to safely raise and support the aircraft. On the 737, mechanics typically place jack pads at designated lifting points near the nose, main landing gear, and sometimes the tail to level the airplane or remove landing gear assemblies. Because improper jacking can cause structural damage or loss of aircraft, airlines and MROs follow strict procedures, load limits, and safety checks. This overview explains common jack types, placement methods, relevant regulations, and best practices to help engineers, technicians, and operators understand how 737 jacking supports long-term safety and reliability.
Common Types of Boeing 737 Jacks
Several jack designs are approved for the 737 fleet, depending on the task and lifting capacity required. Understanding the differences helps teams select the right equipment and avoid misapplication that could affect airframe integrity.
Floor Jacks
Floor jacks are manually operated or hydraulically powered units positioned beneath the aircraft at certified lifting points. They provide vertical lift and often include adjustable leveling features to stabilize the airplane on uneven ramp surfaces.
Pillar Jacks
Pillar jacks use a telescoping column with a hinged head to fit around fixed structures such as fuselage brackets. They are useful when floor space is limited or when precise vertical alignment is needed for tasks like engine removal or landing gear work.
Axle Jacks
Axle jacks raise one landing gear assembly at a time, allowing wheel and brake maintenance or tire changes. Because they lift at the axle, load capacity and extension height must match the gear station requirements for each 737 variant.
Table 1 outlines key attributes of common 737 jack types used in commercial maintenance operations.
| Jack Type | Verified Detail | Source Type |
|---|---|---|
| Floor Jack | Rated capacities typically 40,000–60,000 lb; placed at manufacturer-specified jacking pads | Manufacturer AMM / MEL |
| Pillar Jack | Telescoping lift columns; useful for tight fuselage areas; capacities to 30,000 lb common | MRO practice standards |
| Axle Jack | Lifts landing gear one assembly at a time; heights vary by gear station | Maintenance task cards |
Approved Jacking Points on the 737
Each 737 variant has defined jacking points to distribute loads and protect critical structures. These points are documented in the Aircraft Maintenance Manual (AMM) and shown on jacking diagrams found in the front of the manual set. Typical locations include the forward nose gear torque tube, main gear torque fittings, and occasionally the empennage for specific tasks. Using non-approved points can risk skin buckling, longeron bending, or other hidden damage that may not appear until later inspections.
Forward Jacking Points
Located near the nose landing gear, forward points are often used when positioning the aircraft for ferry flights or when the nose needs to be raised for access to radome or forward cargo systems. The structure in this area is robust, but over-torque on jack screws or uneven loading can transfer loads unpredictably.
Main Gear Jacking Points
Main gear jack pads are designed to take the bulk of aircraft weight during maintenance. These points must be clean, free of debris, and inspected for wear. When a gear is being removed, technicians often place axle jacks under the strut and then transition to floor or pillar support as the assembly is lowered onto jacks.
Empennage and Stabilizer Considerations
Some tasks require raising the tail to access stabilizers or hydraulic lines. For these operations, crews use secondary jacks and carefully calculated moments to prevent pitch changes that could stress the fuselage. Any jacking involving horizontal surfaces should include additional personnel to monitor alignment and load path.
Safety Procedures and Best Practices
Safe jacking begins with planning and verification. Maintenance teams should review the AMM task, confirm aircraft weight and balance, and ensure the ramp surface is suitable. Many organizations require a dual-certificate approach where one technician sets the jacks and a second confirms position and load. Locking pins, safety lines, and hold-downs are used where applicable to prevent unexpected descent.
- Confirm rated capacity: Ensure jack rating meets or exceeds the lifted weight at the selected point.
- Level and stable: Use shims and leveling screws to achieve a stable platform before final lift.
- Intermittent loading: Apply load gradually and recheck leveling after initial lift.
- Physical stop checks: If applicable, verify mechanical stops are engaged before leaving the aircraft unattended.
- Documentation: Log jack type, capacity, point used, and personnel involved in the maintenance record.
Redundancy is common: many MROs use mixed setups, such as a floor jack plus a tail support, to manage load paths and reduce reliance on a single lifting device.
Regulatory and Maintenance Considerations
Regulators expect that any lifting device used on commercial aircraft be rated, tagged, and maintained per manufacturer guidance. In many jurisdictions, periodic testing and certification of shop jacks are required, and records must be available during audits. Because different 737 models (Classic, Next-Generation, and MAX) have varied landing gear and fuselage configurations, the same jack type may have different allowable placements or capacities across fleets.
Organizations should align their jacking procedures with guidance from the airframe manufacturer, component makers, and local aviation authorities. Coordination between engineering, line maintenance, and inspections helps identify wear patterns and ensures that load-bearing components are not stressed beyond design limits.
Integration with Everyday Maintenance
On routine lineside checks, axle jacks are the most visible, used for tire changes and brake work. During heavy checks, floor and pillar jacks support larger structures during panel removal, engine changes, or hydraulic unit replacement. The 737 jacking ecosystem also connects to ground support equipment such as dollies, tow bars, and alignment fixtures that keep the aircraft in the correct position while elevated.
Crew training is essential: newer technicians should complete supervised jacking exercises and shadow experienced peers. Proficiency with reading jacking diagrams, estimating load paths, and communicating with ground crews reduces errors and improves turnaround safety.
Summary
Boeing 737 jacks are purpose-built tools that enable safe access, maintenance reliability, and structural protection when used correctly. By choosing the right jack type, following verified placement points, and adhering to documented procedures, operators can reduce risk, support inspections, and extend airframe life. Continuous training, proper logging, and clear oversight remain central to safe and effective jacking operations on the 737 fleet.
Tags: boeing-737, maintenance-procedures, safety-operation