Cessna 172P Skyhawk
Cracked Seat Frame
The pilot’s lower seat frame support legs cracked at the frame rail cut outs where they attach to the seat-height adjustment arms. Seat frame p/n: 05142047.
Part Total Time: 5150.0 hours
288
Frayed, Stuck, Cracked
The pilot reported an unusual amount of oil was being consumed and oil pressure was fluctuating. There were no external signs of an oil leak. When bleed air was turned on, a fine mist of oil issued from the heater vents. Troubleshooting found the engine vent line (p/n: S51-14) had collapsed, internally pressurizing the case and causing the oil to leak internally into the compressor.
Key Takeaways:
- Aircraft experienced various structural failures, including cracked seat frames, fuselage bulkheads, and misaligned engine mounts, sometimes linked to design flaws.
- Mechanical component failures, such as a collapsed engine vent line and loose engine isolator mount bolts lacking safety provisions, led to operational issues and safety concerns.
- Improper maintenance practices, like incorrectly sealed fuel tank drains, caused significant safety risks and operational malfunctions.
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