Independent third-party repair of aerospace-grade servo and proportional valves: flight simulator motion bases, control loading systems, hydraulic test stands, and ground support equipment. Component-level rebuild and bench verification on the same hydraulic stands the shop has run since 1975.
Aerospace-grade servo valves run in tighter tolerance bands than industrial valves and on different kinds of equipment. Below are four common contexts seen at the bench.
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Flight simulator motion bases
Servo valves come off commercial and military flight simulator motion bases for rebuild. Moog 760, 728, and HR Textron 27-series bodies are common.
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Control loading systems
Servo valves come off simulator control loading hardware. Moog and Parker bodies on yoke, rudder, and stick force-feedback hardware.
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Hydraulic test stands
Aerospace component test stand and structural test rig servo valves come through for component-level rebuild. Moog, HR Textron, and Atchley bodies common.
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Ground support equipment
Servo valves come off aerospace GSE: tow tugs, jacks, and aircraft servicing equipment.
Each unit is opened, inspected, and rebuilt at the component level. Failed parts come from inventory or pulled off donor units. Bench verification before ship.
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Pilot stage rebuild
Jet pipe, nozzle flapper, and torque motor pilot stages cleaned, aligned, and trimmed against documented procedures.
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Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on aerospace-grade valve bodies.
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Coil & feedback work
Burned coil rebuild, feedback wire repair, and LVDT verification on closed-loop bodies.
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Bench testing
Hagenbusch and older-style hydraulic stands for legacy aerospace hardware. Performance data available for purchase.
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Donor parts service
Stock is hit or miss, but legacy hardware shows up often enough that we can pull from past jobs when we have a match. Ask about a specific part number.
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Repair scope
NC Servo handles bench-level component work. FAA, AS9100, or aerospace-OEM re-certification stays with the customer or qualified integrator.
Aerospace valves run in cleaner hydraulic systems than typical industrial hardware, but they cycle harder and run tighter tolerances. The failures we see most often fall into the categories below. Recognize one? A part number is enough to start.
Jet pipe nozzle plugging, flapper damage, jet alignment after a contamination event, or pilot-pressure null shift after long service.
Spool and body
Spool wear, contamination scoring on aerospace-grade lap surfaces, sticky spool action, and internal leakage past the spool.
Coil and feedback
Burned drive coils, feedback wire wear at the pilot, LVDT signal drift, and signal-path component failures.
Connector and electrical
Damaged connectors, cable strain at the entry point, and contamination on the connector pins after years of service in the field.
N500 Workflow
From part number to ship-back
Same four-step path through the shop whether the unit is a flight simulator motion-base servo or an aerospace test-stand jet-pipe valve.
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Get in touch
Call or email with the part number, application context, and a photo of the nameplate if it helps.
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Bench review
Tech opens the unit, inspects pilot and spool, and runs it on the hydraulic stand to confirm what failed.
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Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
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Repair, test, ship
Failed components replaced from inventory or off donors, the valve verified under pressure, and shipped back.
N600 Common questions
Common questions about aerospace valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page in the brand list above.
Do you provide FAA or AS9100 re-certification?
No. NC Servo handles bench-level component repair on the valve hardware. FAA, AS9100, or aerospace-OEM re-certification stays with the customer, OEM, or qualified integrator. Customers using these valves in aerospace service are typically already set up for that side of the work.
What aerospace applications come through the shop?
Flight simulator motion bases, control loading systems, hydraulic test stands, ground support equipment, and aerospace component test rigs. Most of the work is on Moog, HR Textron, Atchley, and Abex servo valves used in those applications.
Do you work on jet-pipe and nozzle-flapper servo valves?
Yes. Both pilot-stage technologies come through the bench. Jet-pipe units (HR Textron 27B50, Abex 447400, Atchley 211 / 213) and nozzle-flapper units (HR Textron 27A50F, Moog 760, Parker servo) all get pilot-stage cleaning, spool work, coil rebuild, and bench testing.
What if my aerospace valve is beyond economic repair?
If the valve is not fixable, we will let you know and help source a replacement.
Do you provide test data with the repair?
Each repaired valve is bench-tested before it ships. Performance graphs and detailed test data are available for purchase.
What is the warranty?
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for contamination, improper installation, and out-of-spec operation. Flushing and filtering the hydraulic system before reinstalling a repaired valve is recommended.
N700 More from NC Servo
Related repair coverage
Other industry-specific pages, the broader category hubs, and the aerospace-relevant brand pages.
Give us a call or send a part number with the application context. We'll check the donor pool, suggest a rebuilt match if we have one, and walk through repair or cross-brand options if we don't.
