Learn what one flight cycle means, how cycle counts set landing-gear inspection and overhaul intervals, and why hard landings are handled separately.
In Aviation & Real-World Flying, a flight cycle is normally one take-off and one landing. Maintenance programmes use accumulated cycles, often alongside hours and calendar time, to schedule landing-gear inspections, overhaul and replacement because take-off, touchdown and ground-load sequences create repeated fatigue and wear regardless of flight duration.
What counts as one flight cycle?
For most aircraft maintenance records, one completed take-off and landing equals one flight cycle, usually abbreviated to FC. A short circuit and a long-distance sector ordinarily add the same single cycle because duration is recorded separately as flight hours.
A training sortie containing several touch-and-goes may add several landing or flight cycles rather than just one for the whole sortie. The exact treatment comes from the aircraft’s approved maintenance programme and operating procedures. A rejected take-off normally does not complete a flight cycle, although a high-energy rejection can trigger its own inspection requirements.
A flight cycle is not always the same as a landing-gear operating cycle. Component instructions may define an operating cycle as one extension-and-retraction sequence. A gear swing performed during maintenance could therefore affect a component’s operating-cycle record without adding an aircraft flight cycle.
| Maintenance measure | What it records | Landing-gear relevance |
|---|---|---|
| Flight cycles | Take-off and landing sequences | Repeated touchdown, ground and retraction loads |
| Gear operating cycles | Extension and retraction as defined for the component | Use of actuators, doors, locks and related mechanisms |
| Flight hours | Operating time under the programme’s definition | Time-controlled inspections and servicing |
| Calendar time | Elapsed days, months or years | Corrosion, seal ageing and deterioration while parked |
| Exceptional event | Hard or overweight landing and other abnormal loads | Immediate conditional assessment or inspection |
How are flight cycles used for landing-gear maintenance?
An approved maintenance programme assigns a cycle interval or retirement limit to each applicable task and component. Maintenance tracking then compares the aircraft’s and component’s accumulated usage with those limits.
- Record each cycle: Flight records and maintenance tracking systems update the aircraft’s total cycles after operation.
- Track the installed component: A landing-gear assembly or life-limited part can have its own cycles since new and cycles since overhaul, especially when transferred between aircraft.
- Apply the controlling interval: If a task has cycle, hour and calendar limits, it is normally due when the first applicable limit is reached.
- Perform the specified action: Depending on the approved data, this may be a visual or detailed inspection, lubrication, non-destructive testing, overhaul or mandatory part replacement.
Cycle-based maintenance reflects the way normal landings repeatedly load struts, axles, torque links and attachment points. Our explanation of how landing-gear components absorb and distribute touchdown loads provides the mechanical background. Those forces also pass into the aircraft’s load-bearing structure and gear attachments.
Do all landing-gear parts have the same cycle limit?
No universal cycle limit applies to an entire landing gear or to every aircraft type. The approved programme may control different items by cycles, hours, calendar time, measured wear or a combination of these.
- Life-limited parts have a mandatory retirement point defined by approved airworthiness data.
- Gear assemblies may have scheduled inspections or overhaul intervals based on cycles and calendar time.
- Tyres and brakes are often monitored closely by condition and wear, even when landing counts are also recorded.
- Seals, fluids and corrosion-sensitive areas may become due by calendar time even on a lightly used aircraft.
This is why a claimed rule such as “overhaul the gear after a fixed number of landings” cannot be applied across aircraft. The airframe variant, component part number, operating environment and approved maintenance programme all matter.
Does a hard landing add extra flight cycles?
A hard landing normally remains one recorded flight cycle, but it can trigger an immediate event-based inspection regardless of the next scheduled cycle limit. The same principle applies to an overweight landing, excessive side loading or another abnormal event covered by the maintenance manual.
There is no single vertical-speed figure that defines a hard landing for every aircraft. Recorded acceleration, touchdown rate, aircraft attitude, weight and crew reports may all feed into the aircraft-specific decision; our guide to assessing touchdown rate and hard-landing criteria explains that distinction. If landing weight is involved, see how maximum landing weight affects loads and inspection decisions.
A common error is to assume that staying below the normal cycle limit means no inspection is needed. Scheduled limits account for ordinary repeated use; conditional inspections deal with unusually severe individual events.
Does landing-gear overhaul reset the cycle count?
An overhaul resets only the counter that the approved maintenance data says it resets. Aircraft total cycles continue accumulating, while a gear assembly may return to zero cycles since overhaul and still retain its full cycles-since-new history.
Mandatory life-limited parts do not automatically receive a new fatigue life because they were cleaned, inspected or installed in an overhauled assembly. Replacement parts begin with their own documented history, while retained parts carry their previous usage forward. When a gear assembly moves to another aircraft, its component records must move with it rather than adopting the receiving airframe’s cycle total.
The rule we stress is simple: use the unit, definition and counter named by the approved task or component data. Flight hours cannot substitute for flight cycles, an overhaul cannot be assumed to erase cycles since new, and no scheduled interval overrides an inspection required after an abnormal landing.