What was found
NEEDLES ON DUAL TACH NOT ALIGNED WHILE RUNNING. FADEC DEGRADED/RESTART FAULT LIGHT ILLUMINATED AFTER STARTUP. REMOVED AND REPLACED DEFECTIVE DUAL TACH GAUGE.
- Difficulty date
- July 23, 2026
- Submitted
- July 25, 2026
- Operation
- Air carrier
- Aircraft
- N404LL
- Make and model
- Bell 407
- Aircraft serial
- 53446
- Aircraft time
- 11,796 hours, 30,590 cycles
- Engine
- Allsn 250C47B
- Engine time
- 9,238 cycles
- System (JASC)
- 7714 · Engine RPM Indicating System
- Part
- Dual Tachometer
- Part number
- 407375008101
- Part serial
- 0056
- Condition
- Degraded
- Location
- Zone 100
- Part time
- 770 hours
- Stage of operation
- TX
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- D
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.