Jabiru repairs

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2200 Instruction & Maintenance Manual - jabiru.fr

An effective stainless steel exhaust and muffler system is fitted as standard equipment, ensuring very quiet operations, which in the Jabiru aircraft have been measured at 62dB at 1000' full power flyover 

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304 stainless exhaust tubing is more prone to cracking than MS because the following reasons;

 

1. It's a higher tensile steel than MS (MS - 400-550Mpa, 304 - 500-750Mpa), so it doesn't withstand flexing from movement as well as MS.

2. The welding of 304 can create "carbide precipitation", whereby the carbon in the metal bonds with the chromium at high temperatures, thereby depleting the weld area and the surrounding area of chromium. This compromises the integrity and rust-resistance of the tubing.

3. If the welding of the 304 used an improper filler metal, this can create a metallurgical mismatch, making the weld prone to premature thermal cracking.

4. Despite the 304 being higher tensile strength, the thinness of the 304 tubing promotes cracking with age and constant use.