The AS350 is a great helicopter to fly and can be a hard one to work on. The tail rotor gearbox, the tail rotor spider and the rotor brake leave very little room for a socket, and some main rotor head jobs need a second person only to hold a wrench.
We make our AS350/H125 tools for those exact spots. This guide shows each tool, the task it is for, and what to check before you use it.
Quick list
10 mm low profile torque adaptor (CA$40): 10 mm fasteners in tight spots, for example on the tail rotor gearbox.
13 mm low profile torque adaptor (CA$40): rotor brake attachment bolts and the tail rotor spider input lever bolt.
Spherical stop bolt holding tool, aluminum (CA$105): holds the main rotor spherical stop bolt heads. For occasional use.
Spherical stop bolt holding tool, steel V2 (CA$150): holds the spherical stop bolt heads, plus a wrench for the landing gear damper cap. For frequent use.
Engine support (CA$600, made to order): supports the engine during MGB removal or MGB input seal replacement.
FOD mast cap, 3D print file (free): keeps FOD out of the mast when the antivibrator is removed.
Prices on 9 November 2026. See the AS350/H125/EC130 tools page for current prices and stock.
Low profile torque adaptors (10 mm and 13 mm)
A standard socket or crowfoot is often too thick to reach AS350 fasteners that sit close to a housing or a lever. Our low profile adaptors are flat "dogbone" adaptors with a 1/4" drive.
10 mm adaptor: 0.24" (6 mm) thick. Made for tight spots such as the tail rotor gearbox.
13 mm adaptor: 0.24" (6 mm) thick. Made mainly for the rotor brake attachment bolts and the tail rotor spider input lever bolt.
12-point (double hex) opening. The adaptor engages a 6-point fastener every 30°, not every 60°, so you need less swing to get the next bite.
CNC laser cut from AR500 steel for toughness.
You can grind the adaptor thinner or narrower if your task needs it.
Torque correction: read this before you torque
A torque adaptor changes the effective length of the torque wrench. If the adaptor is not at 90° to the wrench, the fastener gets a different torque than the wrench shows. You must then apply a torque correction to the wrench setting.
Use the correction method in your maintenance manual or from your torque wrench manufacturer. Always use the torque values and procedures in your maintenance manual.
Spherical stop bolt holding tool (aluminum or steel V2)
Light duty, for occasional use
Holds the spherical stop bolt heads
Integrated wrench for the AS350 landing gear damper cap. It needs two 5/32" (0.156") pins and may not fit all damper part numbers.
For frequent use
Holds the spherical stop bolt heads
Integrated wrench for the AS350 landing gear damper cap. It needs two 5/32" (0.156") pins and may not fit all damper part numbers.
Hole for a "Remove before flight" flag (flag not included)
Which one to choose: if your shop works on AS350 rotor heads every month, choose the steel V2. For a one-time job or an occasional inspection, the aluminum tool is enough.
Engine support for MGB removal and input seal replacement
The engine support holds the engine when the main gearbox (MGB) is removed, or during MGB input seal replacement. It fits the AS350, EC130 and H125.
Height adjustable, to align the MGB-to-engine driveline and install the gimbal pins
Wide feet that do not mark or dent the engine deck
Made to order. Contact us to order.
Free FOD mast cap (3D print file)
When the antivibrator is removed, the open mast is a path for foreign object debris (FOD). This cap closes it. It has a hole for a flag. Print it in a high-visibility color.
The file is free. Add it to your cart and check out at CA$0 to get it.
Questions we get
Can I make the torque adaptor thinner? Yes. You can grind it thinner or narrower. Keep the 12-point opening undamaged, and do not overheat the steel.
Do the spherical stop bolt holding tools fit the EC130? Yes, both versions are for the AS350, H125 and EC130 main rotor head spherical stop bolts.
Do you ship to the United States? Yes. We ship from Canada to the United States and to other countries. Shipping costs show at checkout.
Can you make a tool that is not in the shop? Yes. We design and make custom tools with CNC machining, laser cutting and 3D printing. Tell us about the task.
Before you use any special tool
Crest Aerospace is not affiliated with Airbus Helicopters. Part numbers are for reference only. Before you use a tool, make sure that it is acceptable for the task under your maintenance manual and your regulations. These tools are for qualified maintenance personnel.
