Beech 95B-55 Baron Corroded Fuel Pressure Line Out of concerns about chafing or corrosion, a technician was motivated to closely inspect the right fuel-flow pressure gauge line where it crosses the defrost duct. He was right, finding extensive corrosion at the point of contact. After the line was removed, slight bending pressure cracked the area wide open and it was seen that 288
Chafed, Corroded, Failed
Out of concerns about chafing or corrosion, a technician was motivated to closely inspect the right fuel-flow pressure gauge line where it crosses the defrost duct. He was right, finding extensive corrosion at the point of contact. After the line was removed, slight bending pressure cracked the area wide open and it was seen that the corrosion had actually penetrated to the inside of the line, yet the line was not leaking. If a leak started, the only way to stop it would be to shut down the right engine.
Key Takeaways:
- Multiple aircraft experienced critical component failures across various systems, including fuel, hydraulic, engine, and ignition.
- Specific issues identified were severe corrosion in a fuel pressure line, a separated fuel injection intake tube, cracks in hydraulic lines at stress points, and a failed crankshaft connecting rod.
- Some component failures, such as the fuel injection intake tube, occurred at relatively low operational hours (e.g., 262 hours).
- The incidents emphasize the importance of diligent and targeted inspections for corrosion, chafing, material fatigue, and adherence to proper installation standards, especially for bends in tubing.
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