With our expertise in repairing single, twin, turbo charged, radial and turbine aircraft exhaust, we’ll have you back in the air quickly. You can use the exhaust catalogue below. If you do not find what your are looking for, please give us a call. All files are in Adobe Acrobat format. If you do not have Adobe Acrobat Reader, please click on the Adobe Icon.

With our expertise in repairing single, twin, turbo charged, radial and turbine aircraft exhaust, we’ll have you back in the air quickly. Every part that passes through our system receives only the finest materials and workmanship.

All sheet and tube is 321 stainless steel with most of our aircraft exhaust parts made from stampings just the same as OEM parts, not an inferior spliced together part. All welds are internally purged of course.

Note the difference in construction between the units above. The difference in construction can result in a catastrophic failure of the exhaust. Acorn PMA(Left) and a FAA-PMA(Right).

FAA-PMA parts are often not equal replacements for the OEM parts. They may serve the same function however the service life can be reduced due to poor design. Note the difference in construction between the units above. The unit on the left is a FAA-PMA unit. This unit failed prematurely due to cracks at the at the welded joints. The OEM unit on the right failed due to old age. These parts are very clearly different.

We also use the pull thorough extensively; this is where a smaller hole is cut instead of the standard size hole. Then a lip is extruded to move the weld up from the crack prone shoulder area. This process creates a very strong joint between exhaust members.

Here you can see the difference between a part with(right) and without(left) a pull through. The part on the left is cracked right alongside the weld.

Rigid weld fixtures are used to ensure precision fit when it’s time for installation. Wire bails are added where possible in outlets to prevent blockage, another little extra. Finally a leak test is performed and then the last QC inspection. All our welding technicians are certified to the rigorous AWS D17.1 Aerospace Welding Standard.

The combined welding experience of our technicians is a staggering 319 years with two of the original employees from 1987 still with us. Large or small, simple or complex we are your “One Stop Shop” for all your aircraft exhaust solutions.

Acorn Welding Ltd is authorized to meet the overhaul requirements of "Paragraph G". We recommend that all exhaust be replaced at engine overhaul. Exhaust components overhauled by Acorn Welding are overhauled to like new condition using OEM materials and processes. Our exhaust is designed to exceed the 2500 hour inspection interval between changes. However due to the difficulty of removing some configurations we recommend that it be changed at engine change.

Many components in these exhaust can be manufactured our of Stainless Steel, Inconel or a combination of the two. The Cessna Maintenance Manual requires that Stainless steel, Partial Steel, Unknown or Repaired exhaust be ultrasonically inspected every 500 hours of operations. This inspection does not apply to the tailpipes, wastegate components, or exhaust stacks. However, it does apply to the slip joints, turbo inlet wyes and most importantly, the aft exhaust elbows. AD 2000-01-16 does not exempt this ultrasonic inspection and does not require the installation of Inconel parts. You may or may not have to the 500 hour ultrasonic inspection depending on your requirement to adhere to Cessna Maintenance procedures. However, in many jurisdictions , commercially operated aircraft are required to adhere to Cessna Maintenance procedures. Acorn Welding customers can contact us for a record of the materials used on their aircraft.

Acorn Welding is the worlds largest manufacturer of radial exhaust in the world. We not only rebuild and repair old exhaust we also manfacture new exhaust for out of production aircraft. Acorn Welding has built radial exhaust for many aircraft from the oldest Boeing in the world to the agricultural work horses of the world all the way to todays modern fire suppresion aircraft.