Exhaust System Upgrade Available for Cessna 120/140/140A from Aerospace Welding Minneapolis, Inc.
An STC program has made it possible for Cessna 120/140/140A owners to upgrade to a Cessna 150 exhaust system, replacing mild steel components with stainless steel, enhancing cabin heat and eliminating the AD that requires exhaust system checks every 25 hours. Of the three C-150 muffler styles approved for installation with the STC, the “pancake” style is the most popular upgrade. Any A&P Mechanic can install the new system.
The STC upgrade form for Cessna 120/140/140A aircraft is available from for $100 to members of the Cessna 120/140 Association and $125 for non-members (who can join the Association for $25). The components for the Cessna 150 exhaust system are available to STC holders through Aerospace Welding Minneapolis, Inc.
Each conversion kit includes: 2 mufflers, 2 risers, 2 tailpipes, 2 shrouds, gaskets, riser clamps, tail pipe clamps and attaching hardware. Each part in the replacement exhaust system comes with a 12-month, unlimited hours warranty against workmanship defects. Depending on the type of engine operations and maintenance program, the life of the components will vary, but all should last considerably longer than the original systems. Given the age and total times on Cessna 120s, 140s, and 140As, there are likely a considerable number of candidates for the replacement/upgrade systems.
