Service difficulty report · Lock Nut · Agusta A109E

Difficulty date
July 6, 2023
Submitted
July 7, 2023
Operation
Air carrier
Aircraft
N820FT
Make and model
Agusta A109E
Aircraft serial
11701
Aircraft time
4,636 hours, 9,570 cycles
Engine
Pwc PW206C
Engine time
4,310 hours, 7,237 cycles
Part
Lock Nut
Part number
NAS18054
Part serial
NSN
Condition
Cracked
Location
Transmission
Component
Transmission · Agusta
Component part number
109040003109
Stage of operation
IN
How discovered
V
Nature of condition
F
Precautionary procedure
O

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

What was found

WHILE PERFORMING THE POST FLIGHT CHECK IT WAS FOUND THAT THE SWASHPLATE SUPPORT WAS LOOSE AT ITS MOUNTING POINT. UPON FURTHER INSPECTION IT WAS FOUND THAT ALL 6 NUTS WERE WORN AT THE BASE AND 5 OF THE 6 WERE CRACKED. ALL NUTS WERE BACKED OFF APPROX.1.5 TURNS AS FOUND WITH LESS THAN 1IN LB BREAKAWAY TQ. ALL INFORMATION WAS SENT TO THE ENGINEERING DEPT FOR REVIEW. THE LOCKING FEATURE OF THE NUT HAD CRACKED. THESE NUTS ARE THE REPLACEMENT PART CALLED OUT IN AD2014-11-07 / BT109EP-131, PART NUMBER NAS1805-4. THE ONE TIME AD WAS COMPLIED IN FEB 2014.

More about the Agusta A109E