SDR 2012FA0000277

Service difficulty report · Spark Plug · Maule M7260C

Difficulty date: March 6, 2012
Submitted: May 4, 2012
Operation: General aviation
Aircraft: N14AE
Make and model: Maule M7260C
Aircraft serial: 30012C
Engine: Lyc IO540*
System (JASC): 7421 · Spark Plug/Igniter
Part: Spark Plug
Part number: REM38S
Condition: Mismanufactured
Location: Engine
Part time: 205 hours
Stage of operation: IN
How discovered: 9
Nature of condition: W
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

INSTALLED NEW MFG FINE WIRE PLUGS IN FEB 2010 AT 1260 HRS TT. NOTICED A PROBLEM WITH THE RESISTORS IN A FEW OF THE PLUGS. NOTICED HARD STARTING WHEN HOT. AT ANNUAL INSPECTION, 7 OF 12 PLUGS HAD FAILED, THE RESISTORS WERE COMPLETELY OPEN AND REGISTERED 1 ON THE OHM METER. THE OTHER 5 WERE HIGH, 1 AT 36,000. THEY WERE ALL REMOVED AND REPLACED.

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