Service difficulty report · Circuit Breaker · Lear 45LEAR

Difficulty date
May 18, 2025
Submitted
May 28, 2025
Operation
Air carrier
Aircraft
N472FX
Make and model
Lear 45LEAR
Aircraft serial
45501
Aircraft time
4,634 hours, 3,468 cycles
Part
Circuit Breaker
Condition
Smoke
Location
Zone 200
Stage of operation
CR
How discovered
O
Nature of condition
B
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DIVERTED DUE TO A TRIPPED CB LABELED "OVRHD" ON THE COCKPIT LIGHTS SECTION OF THE RH CB PANEL AND AN ELECTRICAL BURNING SMELL REPORTEDLY COMING FROM BENEATH THE PILOT'S SEAT. CREW FOLLOWED THE QRH, WHICH APPEARED TO ISOLATE THE ISSUE. AIRCRAFT LANDED WITHOUT INCIDENT AT KCLT. TECHNICIAN INSPECTED THE BACKSIDE OF THE RH CB PANEL AND FOUND NO SIGNS OF SHORTED WIRES. AFTER POWERING UP THE AIRCRAFT AND RESETTING THE "OVRHD" CB, TECHNICIAN OPERATED BOTH OVERHEAD LIGHTING DIMMER SWITCHES THROUGH ALL POSITIONS AND LEFT THE LIGHTS ON FULL BRIGHT FOR 15 MINUTES. THE CB DID NOT TRIP AGAIN. FAULT COULD NOT BE DUPLICATED; NO DEFECTS NOTED IAW AMM 24-60-01.