Parts And Components

During the installation and operational check of two new Unison/Slick magnetos-plus harness and eight spark plugs-to correct a hard starting discrepancy, the engine had a 200-300 RPM magneto drop on the left magneto.

Troubleshooting determined one of the eight new spark plugs (p/n UREM40E) was defective. Once the defective plug was replaced with a known good plug, the engines operational check was good.

Part Total Time: 0 hours.

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The throttle cable (p/n 455-350) broke inside its housing. Frayed ends caught in the cable housing, resulting in the throttle becoming stuck in the full-open position. The pilot made a successful “dead-stick” landing.

Part Total Time: 9670.0 hours.

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A Cessna 152 pulled by a Lycoming O-235 developed carburetor problems. The pilot reported partial loss of power and executed a precautionary off-field landing-there was no damage to the aircraft. Teardown of the carburetor (model and p/n MA-3PA and 10-5267, respectively) revealed metal shavings in the accelerator pump circuit. It is suspected the metal particles originated from the accelerator pump stems rubbing on the housing.

Part Total Time: (unknown).

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“This through-bolt is the replacement (bolt) installed August 2005 due to the original through-bolt also breaking at the same location (it managed 650 hours). It is ironic both bolts broke at the same location with identical break lines, the first with 650 hours since remanufacture and the replacement with 200 hours.”

Part Total Time: 200.0 hours.

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A new converter was installed per Lone Star Aviations instructions: the diagrams and installation was approved with a 337 (field approval). The converter failed in less than 10 seconds. Out of five converters, four in aircraft and one on the test bench, all have failed (p/n LS03-05002).

Part Total Time: 0.003 hours

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