SDR 2022FA0000444

Service difficulty report · Intake Valve · Robsin R44

Difficulty date: October 28, 2019
Submitted: August 10, 2022
Operation: General aviation
Aircraft: N41LY
Make and model: Robsin R44
Aircraft serial: 30020
Aircraft time: 274 hours
Engine: Lyc O540F1B5
Engine time: 274 hours
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Intake Valve
Condition: Burned
Location: Zone 400
Part time: 181 hours
Stage of operation: IN
How discovered: B
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

PARTIAL LOSS OF POWER. TAKE FOR ANNUAL, COMPRESSIONS WERE LOW, INTAKE VALVES BURNED WITH METAL IN OIL. BORE SCOPED CYLINDERS. ENGINE WAS REMOVED AND SHIPPED TO LYCOMING. EXCESSIVE WEAR WAS NOTED ON ROCKER ARMS, PUSHRODS AND ROCKER SHAFTS OF ALL CYLINDERS. CYLINDERS1,2,4,5,6 WERE REPLACED WITH KITS. CYLINDER 3 WAS HONED.