SDR NX4R000010

Service difficulty report · Shaft · Cessna 172S

Difficulty date
April 11, 2011
Submitted
April 11, 2011
Operation
General aviation
Aircraft
N453ER
Make and model
Cessna 172S
Aircraft serial
172S10500
Part
Shaft
Part number
05600595
Condition
Worn
Location
Yoke
Part time
3,356 hours
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 AN INSPECTION, THE TECH NOTICED AN INDENTATION IN THE PILOT'S YOKE SHAFT. ALTHOUGH SMOOTH, IT WAS NOTICED THAT A SUBSTANTIAL AMOUNT OF THE WALL THICKNESS WAS WORN AWAY. IF SITTING IN THE CO-PILOT'S SEAT, THE WEAR WOULD BE LOCATED AT THE 6 O'CLOCK POSITION OF THE SHAFT WEAR IT RESTS ON THE PANEL BEARINGS DURING NORMAL OPERATION. AFTER DISCUSSING THE ISSUE WITH THE MFG, A TOTAL WEAR OF .009" WAS ALLOWED. THIS WEAR WAS .017". THE SHAFT WAS REPLACED. ALTHOUGH THIS IS IN A VERY EASY PLACE TO INSPECT, THE SMOOTH FEEL OF THE WEAR MAY HIDE THE SERIOUSNESS OF THE PROBLEM.

More about the Cessna 172S