What was found
PERFORMING TRANSMISSION OIL AND FILTER CHANGE, MECHANIC NOTED THAT NEW OIL FILTER WOULD NOT INSTALL ON THE FILTER BOSS. WENT THROUGH INVENTORY AND FOUND THAT A TOTAL OF 10 FILTERS FROM OUR STOCK WOULD NOT FIT ON THE FILTER BOSS.
- Difficulty date
- August 7, 2025
- Submitted
- February 10, 2026
- Operation
- General aviation
- Aircraft
- N723SF
- Make and model
- Bell 407
- Aircraft serial
- 53264
- Aircraft time
- 19,804 hours, 13,409 cycles
- Engine
- Allsn 250C47B
- Engine time
- 9,409 hours, 13,409 cycles
- System (JASC)
- 1220 · Oil Servicing
- Part
- Filter
- Part number
- WF338110
- Condition
- Mismanufactured
- Location
- Zone 200
- Component
- Transmission · Bell
- Component part number
- 407040006107FM1
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- W
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.