When you buy a turbojet engine for a UAV, target platform or test program, the purchase is the beginning of the relationship, not the end. This page explains, in plain terms, the warranty that applies to SWIWIN (玄云) turbine engines supplied through Zhuhai Shengfang Technology — an authorized distributor of SWIWIN turbine platforms — and exactly what happens if an engine ever needs repair. Two commitments are worth remembering up front: warranty coverage runs for 25 hours of cumulative engine running time, and once an engine is outside warranty, we repair it at cost, with no labor markup.
SWIWIN engines are designed and manufactured by Baoding Xuanyun Turbojet Power Equipment R&D Co., Ltd. (SWIWIN, 玄云). The warranty described on this page is the standard SWIWIN warranty policy, administered with the manufacturer's technical support and delivered to you through our team as the authorized distributor. We are not the manufacturer; our role is to make warranty execution fast and predictable — to assess each case, coordinate with SWIWIN where factory evaluation is required, and return a correctly repaired engine with a documented running-time reading.
Warranty exists for one situation: an engine that was installed, fueled, operated and maintained according to its manual develops a failure attributable to defective materials or factory workmanship. In that situation, qualifying repair work is handled under warranty at no charge for the covered parts and labor. Every claim is evaluated against the engine's actual condition, its running-time record and the circumstances of the failure. This is precisely what protects genuine warranty claims: it allows a manufacturing defect to be distinguished from impact, contamination or operation outside the manual.
The warranty period for SWIWIN turbine engines supplied through Sheng-Fang is 25 hours of cumulative running time — the total time the engine has actually run, from its very first start, as recorded by the ECU. Running time accumulates whether the engine is on a test stand, installed in an airframe or run on any other platform, and it follows the engine rather than the owner.
This is the warranty standard we commit to, applied in line with the SWIWIN standard warranty framework. SWIWIN's published after-sales materials express the free-warranty window as one year from the date of sale or 25 hours of accumulated running time, whichever comes first. Our practical execution follows the same framework: the 25-hour running-time allowance is the operative coverage benchmark, and engines should also not sit unused for long periods without being started, inspected and serviced according to the manual. Coverage is defined by a running-hour allowance rather than calendar time because a turbine's wear is driven almost entirely by hot-section cycles.
SWIWIN ECUs record operating data and running time; the GSU and the manufacturer's PC software read it out. A claim submitted with an accurate hour reading, the ECU data file and a clear description of the fault can often be assessed without shipping the engine first. Reaching 25 hours does not mean an engine is "used up" — SWIWIN engines are designed to keep operating with scheduled maintenance, and the maintenance interval aligns with the same 25-hour mark, which is exactly when an at-cost maintenance inspection is most valuable.
Within the warranty period, qualifying problems caused by defects in materials or workmanship during normal use are handled under warranty. This includes:
When a covered fault is confirmed, the remedy is repair or replacement of the defective part(s) at the discretion of the service evaluation, using new or factory-rebuilt components. Warranty coverage is limited to the engine and its supplied ancillaries; it does not extend to the airframe, the installation, downtime or any other losses associated with a failure. This boundary is standard across the turbine industry and is what keeps genuine warranty repair genuinely free.
If a failure could plausibly be either a manufacturing defect or an operational cause — a flameout at low hours with clean fuel, for example — do not pre-judge it. Send us the ECU data and a short video, and let the evaluation determine the cause. Our full engine lineup, including the larger industrial XX400WP, is documented in the engines section.
Most turbine failures we see are not manufacturing defects, and stating this clearly is fairer to everyone. The following situations are outside warranty coverage.
A short pre-flight routine — inspecting the intake for debris, confirming fuel and oil quality, verifying connections and allowing the cool-down sequence to complete — prevents the great majority of these exclusions.
Warranty status should never decide whether an engine is worth repairing. For any issue outside warranty coverage — the 25-hour period has been reached, or the failure falls under an exclusion — we repair the engine at cost. Concretely, this means:
This is a deliberately straightforward repair model, and it reflects how SWIWIN engines are intended to be supported for the long term: they are built to keep running through scheduled 25-hour maintenance, and keeping that maintenance inexpensive keeps fleets flying. You will always know the price in advance — and if an inspection finds the failure is actually a covered defect, the work is handled under warranty instead.
For both warranty and non-warranty service, the owner covers the inbound courier cost to the service center, and the engine must be properly packed to prevent damage or loss in transit. Engines returned for evaluation should include the ECU, pump and associated wiring where practical, together with the running-time data and a description of the fault. If a repair estimate is declined, the engine is returned with return shipping arranged at the owner's cost.
The claim process is designed to be fast for distributors, resellers and end users alike:
Distributors and resellers can consolidate warranty claims from your own customers through us in a single batch. Please collect the same evidence package per engine — evaluation, rather than paperwork, is where we can actually save time.
The practical execution of every warranty is subject to the official SWIWIN warranty terms and the actual technical evaluation of the engine. That does not change the two firm commitments on this page: 25 hours of cumulative running-time coverage, and at-cost repair beyond it.
Warranty is based on cumulative running time — 25 hours from the engine's first run — applied within the SWIWIN standard framework, under which the free-warranty window runs until one year from the date of sale or 25 accumulated hours, whichever comes first. Keep your purchase record and the ECU running-time log; the ECU data is the primary evidence of hours.
Every minute the engine runs counts: test-stand runs, ground runs and flight time all accumulate in the ECU's running-time record, regardless of the airframe or owner. Idle time and auto-restart events also add to the logged total, which is why reading the ECU rather than estimating from flights matters.
No — crash and impact damage is excluded regardless of cause, and an engine that still runs after impact may have hidden bearing, shaft or compressor damage. Do not fly it. Contact us for an inspection; post-crash inspection and repair is handled at cost.
Yes. Non-approved fuels such as gasoline, non-approved oils such as two-stroke or automotive oil, or an incorrect oil mix ratio are exclusions, and together they account for the majority of premature bearing and hot-section failures. The approved fuel and oil requirements are fully covered in our turbojet fuel guide.
Only the actual cost of genuine parts and materials, with no labor markup. You receive an itemized estimate before any work starts; if the evaluation instead finds a covered manufacturing defect, the work is warranty service at no charge. You cover inbound shipping to the service center in both cases.
Often not. Many faults — particularly start and parameter issues — can be diagnosed from the ECU data file, the running-time reading and a video of the fault. Contact us with the evidence package first; shipment is coordinated only if hands-on evaluation is required.
Send us the model, serial number, cumulative running time and a short video of the fault. We'll confirm whether it qualifies for warranty coverage or quote the at-cost repair — usually within one business day.