Service difficulty report · Retaining Ring · Piper PA28181

Difficulty date
April 8, 2025
Submitted
April 8, 2025
Operation
General aviation
Aircraft
N43753
Make and model
Piper PA28181
Aircraft serial
287890009
Aircraft time
2,717 hours
Engine
Lyc O360A4M
Part
Retaining Ring
Part number
484720
Condition
Defective
Location
Zone 700
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

DURING THE INSTALLATION OF THE RETAINING RING IT IMMEDIATELY BROKE. SENT THE STRUT TO ANOTHER SHOP THEY ATTEMPTED AND BROKE 2 MORE. SPOKE WITH PIPER TECHNICIAN AND RECEIVED THIS AS A RESPONSE. "AS PER OUR PHONE CONVERSATION YESTERDAY REGARDING THE INSTALLATION OF RETAINING RING 484-720. I WENT DOWN TO THE GEAR SHOP AND SPOKE WITH THE TECHNICIAN THAT BUILDS UP THAT ASSEMBLY. HE STATED THEY HAVE A SPECIAL TOOL THAT ACTS AS A SLIDE HAMMER TO INSTALL THE RETAINING RING. PLEASE SEE THE ABOVE ATTACHED EMAIL. THE TECHNICIAN DID SAY EVEN WITH THE TOOL IT IS NOT UNCOMMON FOR SOME OF THE RINGS TO BREAK BEFORE THEY GET ONE INSTALLED. " THAT TELLS ME THERE IS AN INHERENT FLAW IN THE MANUFACTURING PROCESS. POSSIBLY INCORRECT TEMPERING OF THE STEEL. FAR TO BRITTLE FOR A RETAINING RING. I BELIEVE THIS IS A MANUFACTURING AND ENGINEERING ISSUE. IF THEY BREAK THAT EASILY ARE THEY FATIGUED ONCE INSTALLED AND COULD POSSIBLY FAIL AT A LATER DATE AND CAUSE DAMAGE TO THE NOSE GEAR RESULTING IN FAILURE. AND POSSIBLE DAMAGE TO THE ENGINE, PROP AND PEOPLE.

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