SDR ASAA2019112523439

Service difficulty report · Gearbox · Boeing 737890

Difficulty date: November 22, 2019
Submitted: November 26, 2019
Operation: Air carrier
Aircraft: N593AS
Make and model: Boeing 737890
Aircraft serial: 35107
Aircraft time: 44,374 hours, 13,364 cycles
Engine: Cfmint CFM567B27B3
Engine time: 44,524 hours, 13,390 cycles
System (JASC): 7260 · Turbine Engine Accessory Drive
Part: Gearbox
Condition: Making Metal
Location: Lt Engine
Part time: 44,524 hours, 13,390 cycles
Stage of operation: IN
How discovered: V
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

WHILE PERFORMING TASK CARD FOUND NUMEROUS MAGNETIC PARTICLES ON AGB/TGB MCD. LARGEST CHIP MEASURED .093 INCHES INITIATED MIG 2C 40-0036823. GROUNDED - YES. AFTER CONTACTING AS MX ENGINEERING PERFORMED B737-800 AMM 79-00-00-200-804-F00. ACCOMPLISHED STEP H.(7)(B)1), FOUND NO MATERIAL ON STARTER MAGNETIC PLUG. ACCOMPLISHED AMM 72-62-00-200-802-F00. REMOVED TGB PER STEP 2.F.G FROM #1 ENG IAW AMM 72-62-00-080-801-F00. PERFORMED TGB INTERNAL INSPECTION. NO DEFECTS NOTED. IAW AMM 72-62-00-200-802-F00 F.6F - ENGINE REQUIRES REPLACEMENT.