OpenAirDocs.org

SDR CA090703003

Open the Markdown

Service difficulty report · Nut · Snias AS350B3

FAA SDR system

Difficulty date
June 30, 2009
Submitted
October 23, 2009
Operation
General aviation
Make and model
Snias AS350B3
Aircraft time
1,465 hours
Engine
Tmeca ARRIEL2B1
System (JASC)
6320 · Main Rotor Gearbox
Part
Nut
Part number
DHS43911142
Condition
Loose
Location
M/R Gearbox
Part time
1,850 hours
Component
Gearbox
Component part number
350A32031002
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

(CAN) WHILE CARRYING OUT 600 HR INSP ON ACFT, WAS NOTED THAT THE MAIN ROTOR GEARBOX INPUT BEVEL NUT WAS LOOSE. THERE WAS SIGN OF FRETTING AND THE ADAPTER WAS LOOSE. THE NUT WAS REMOVED AND PINION INSPECTED NO DAMAGE. MFG WAS CONTACTED AND THE PINION WAS INSPECTED AND FOUND SERVICEABLE. A NEW NUT WAS INSTALLED AND ACFT RETURNED TO SERVICE. THIS IS THE MAIN INPUT DRIVE BETWEEN THE ENGINE AND TRANSMISSION AND IF THIS WASN`T FOUND WOULD HAVE DETACHED THE DRIVE BETWEEN ENGINE AND TRANSMISSION.