SDR QMLA2026091320064

Service difficulty report · Bypass Valve · Bell 407

Difficulty date: September 13, 2026
Submitted: September 13, 2026
Operation: Air carrier
Aircraft: N293AM
Make and model: Bell 407
Aircraft serial: 54617
Aircraft time: 6,490 hours, 10,346 cycles
Engine: Allsn 250C47B
Engine time: 3,583 hours, 12,059 cycles
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Bypass Valve
Condition: Failed
Location: Nr 1 Engine
Stage of operation: LD
How discovered: V
Nature of condition: B
Precautionary procedure: E

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

What was found

UPON LANDING NOTICED COPIOUS AMOUNTS OF SMOKE BILLOWING FROM THE EXHAUST. SHUTDOWN AND NOTED THAT THE ENGINE OIL SITE GLASS WAS EMPTY. REPLACED ENGINE TURBINE ASSEMBLY, COMPETED AAIP INSPECTIONS, RII CHECKLIST, OPERATIONAL CHECKS, AIRCRAFT RETURNED TO REVENUE SERVICE, REF MEC-64099

More about the Bell 407