Pilot stage rebuild
Jet pipe, nozzle flapper, and torque motor pilot stages cleaned, aligned, and trimmed against documented procedures.
Aerospace Servo Valve Repair & Bench Testing
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.
Where Aerospace Servo Valves Sit
Four aerospace application contexts
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.
01
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.
02
Control loading systems
Servo valves come off simulator control loading hardware. Moog and Parker bodies on yoke, rudder, and stick force-feedback hardware.
03
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.
04
Ground support equipment
Servo valves come off aerospace GSE: tow tugs, jacks, and aircraft servicing equipment.
What NC Servo Does
Component-level repair on aerospace valves
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.
Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on aerospace-grade valve bodies.
Coil & feedback work
Burned coil rebuild, feedback wire repair, and LVDT verification on closed-loop bodies.
Bench testing
Hagen-Busch and older-style hydraulic stands for legacy aerospace hardware. Performance data on request.
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.
Repair scope
NC Servo handles bench-level component work. FAA, AS9100, or aerospace-OEM re-certification stays with the customer or qualified integrator.
Brands
Aerospace servo valve brands serviced
Top brands seen on aerospace and flight-simulation hydraulics. Click through for the dedicated brand page.
Common Faults
What usually shows up on aerospace valves
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.
| Pilot stage | 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 flight-line service. |
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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01
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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02
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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03
Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
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04
Repair, test, ship
Failed components replaced from inventory or off donors, the valve verified under pressure, and shipped back.
FAQ
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 on request.
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.
More from NC Servo
Related repair coverage
Other industry-specific pages, the broader category hubs, and the aerospace-relevant brand pages.
Valve repair hub
Full directory of 20+ valve brands with dedicated pages.
HR Textron brand page
27 series jet-pipe servovalves: 27E50 two-stage, 27B50, 27C50 R-DDV, 27A50F nozzle flapper.
Moog brand page
Moog 760, 30, D633 servo valves and WinDrive servo drives.
Atchley brand page
Atchley 211 / 213 jet-pipe servovalves on turbine and aerospace control.
Abex brand page
Abex 447400 jet-pipe servovalves with FM approval.
Repair vs replace
When component-level repair makes sense versus buying new or rebuilt.
Aerospace valve down? Send a part number
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.