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Pinned.

The following information is derived from the FAA's Service Difficulty Reports and Aviation Maintenance Alerts.

CUB CRAFTERS CC18-180 TOP CUB

Missing Aileron System Cotter Pin

Discovered right aileron cable-to-bell-crank attach bolt nut missing its cotter key (p/n MS24665). Nut was still present.

Part Total Time: 27.0 hours

CUB CRAFTERS CC18-180 TOP

Missing Elevator System Cotter Pin

During inspection of new aircraft for contract compliance verification, discovered up elevator cable-to-elevator bellcrank attach bolt nut (castellated nut) missing its cotter key. Nut was still present but appeared to have "backed off" 1.0 to 1.5 turns.

Part Total Time: 24.0 hours

PIPER PA-32-300 CHEROKEE SIX

Failed Throttle Control Linkage

Crew lost control of power settings due to separation of engine control rod end from power lever. Cause of separation was failure of cotter pin retaining clevis pin between cable end and power lever. Subsequent NTSB report disclosed cotter pin considered to be improper size, with one of the two retention tangs broken at root of the pin. The remaining tang was not bent enough to retain pin. Improper installation methods suspected.

Part Total Time: Unknown

PIPER PA-46-500TP MALIBU MERIDIAN

Missing NLG Cotter Pin

Owner noticed a vibration shortly after landing. Found nose landing gear center torque link hardware missing and nosewheel misaligned. Upon complete inspection of NLG assembly, found bolt, nut, washer and cotter key missing from center torque link. The NLG tire was lightly flat-spotted.

Part Total Time: 18.0 hours

BEECHCRAFT MODEL 76 DUCHESS

Failed Propeller Control

Left propeller feathered in-flight for training. Crew was unable to unfeather propeller. Found clevis pin missing on left propeller control arm at control quadrant. Also found evidence of wear at left and right prop control arms, caused by feathering detent spring. k Suspect the cotter pin on left clevis pin was damaged, then worn through by detent spring, causing the cotter k pin to fail and allowing the clevis pin to fall out.

Recommend that the cotter pin be installed pointing toward the left side of the prop control arm to avoid contact with feathering detent spring.

Part Total Time: 5566.0 hours

BEECHCRAFT MODEL B35 BONANZA

Collapsed Landing Gear

The cotter pin was not installed in the clevis pin at the outboard end of the landing gear actuator rod. This allowed the rod to separate from the linkage and the landing gear to collapse. The clevis pin was recovered and there was no indication a cotter pin had ever been installed-the hole was full of dirt and rust.

Part Total Time: 2785.0 hours

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Title Annotation:SQUAWK BOX; aviation maintenance alerts
Publication:Aviation Safety
Geographic Code:1USA
Date:Mar 1, 2015
Words:426
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