What was found
DURING CRUISE FLIGHT PILOT REPORTED ENGINE BEGAN TO RUN ROUGH AND MANIFOLD PRESSURE INCREASED. HELICOPTER RETURNED TO HELIPAD AND MADE A NORMAL LANDING. EXHAUST VALVE STEM BROKE AT BELL CURVE AND WAS RELEASED INTO CYLINDER.
- Difficulty date
- April 8, 2022
- Submitted
- September 19, 2022
- Operation
- General aviation
- Aircraft
- N911TM
- Make and model
- Robsin R44RAVENII
- Aircraft serial
- 10194
- Aircraft time
- 6,204 hours
- Engine
- Lyc IO540AE1A5
- Engine time
- 5,170 hours
- System (JASC)
- 5300 · Fuselage Structure (General)
- Part
- Exhaust Valve
- Part number
- 17B23935
- Condition
- Broken
- Location
- Engine
- Part time
- 1,846 hours
- Component
- Cylinder Assy. · Lyc
- Component part number
- LW12993
- Stage of operation
- CR
- How discovered
- B
- Nature of condition
- E, R
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.