For Cirrus SR22 owners in Southern California, particularly those operating out of Van Nuys, a comprehensive inspection of the landing gear seals is an essential part of the annual inspection. The aircraft’s fixed tricycle gear, with its oleo struts, requires careful attention to the seals that hold in the hydraulic fluid. In the high-temperature environment of the Southwest, these seals can become brittle, crack, and fail, leading to a variety of issues from a “squatting” aircraft to a nose wheel shimmy. A professional and consistent inspection is an act of authority that provides the social proof your aircraft is safe to fly.
This article outlines the key inspection points for the landing gear seals, emphasizing the importance of professional maintenance and highlighting how The Aero Center’s unique 24/7 service helps to minimize aircraft downtime.
THE VITAL ROLE OF LANDING GEAR SEALS
The Cirrus SR22’s landing gear relies on oleo-pneumatic struts, which use both oil and compressed air to absorb landing shocks and support the aircraft on the ground. The seals within these struts are responsible for keeping the hydraulic fluid contained and the compressed air from leaking out. A compromised seal can lead to a variety of issues: a loss of fluid can cause the strut to compress fully, leading to a “squatting” aircraft and reduced ground clearance. A loss of air pressure can also reduce the strut’s ability to absorb shock, leading to hard landings and potential damage to the airframe. The pilot’s consistency in performing a thorough pre-flight check is a good habit, but the mechanic’s consistency in checking the seals is what ensures their reliability.
CRITICAL INSPECTION POINTS AND PROCEDURES
During an annual inspection, a certified mechanic performs a detailed, multi-step check of the landing gear seals. This goes beyond a simple visual scan and involves a deep dive into the system’s function and integrity. Here are the key steps:
- Visual Inspection for Leaks: The mechanic will first perform a comprehensive visual check of the struts. They will look for any signs of hydraulic fluid leaks, which may appear as an oily residue on the outside of the cylinder or on the landing gear strut fairing. A leak is a clear sign of a failing seal. They will also look for any signs of physical damage to the seals, such as cracks, nicks, or deformation.
- Checking Proper Extension and Fluid Level: A well-functioning oleo strut will extend to its proper length when the aircraft is on the ground. The mechanic will check the extension of all three struts—the nose gear and the two main gear—and compare the length to the manufacturer’s specifications. A strut that is not extending properly can indicate a loss of fluid or air pressure due to a failing seal.
- Tire and Brake Inspection: As part of the landing gear inspection, the mechanic will also check the tires for uneven wear and the brakes for proper function. A strut that is not functioning properly can cause uneven tire wear and can also put additional stress on the braking system. The mechanic will inspect the brake lines for leaks and the brake pads for wear.
- Component Security: The landing gear struts are attached to the airframe with a series of bolts and fittings. The mechanic will check these attachment points for security and proper torque. A loose fitting or a damaged bolt can lead to a variety of issues, from a shimmy to a catastrophic failure.
THE AERO CENTER’S COMMITMENT TO DOWNTIME REDUCTION
For Cirrus SR22 owners in California, Arizona, and Nevada, the inconvenience of airplane downtime for an annual inspection is a major concern. This is where The Aero Center distinguishes itself. We are the only 24/7 maintenance center in the region. Our unique service model is built on the principle of consistency and a dedication to getting your aircraft back in the air as quickly as possible without compromising on safety or quality.
Our FAA-certified mechanics are highly experienced with the specific systems of the Cirrus SR22. We follow all manufacturer checklists and a meticulous, step-by-step process to ensure your aircraft is not only compliant with regulations but is also a safe and reliable machine. Our authority in the field is built on a foundation of trust and a proven track record of providing reliable, expert maintenance to the general aviation community.
Footnotes:
- Cirrus Aircraft. “Cirrus SR22 Maintenance Manual”.
- Federal Aviation Administration. “AC 43.13-1B: Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair”.
- Savvy Aviation. “Prebuy Checklist”.
- Aircraft Owners and Pilots Association (AOPA). “Landing Gear Care”.
The Aero Center is located at William J. Fox Airfield KWJF | Lancaster, CA. Contact us at 209.885.6950 for questions or appointments.