SDR AALA202204065586

Service difficulty report · None · Boeing 737

Difficulty date: April 3, 2022
Submitted: April 6, 2022
Operation: Air carrier
Aircraft: N817NN
Make and model: Boeing 737
Aircraft serial: 29558
Aircraft time: 36,208 hours, 14,783 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: None
Condition: None
Stage of operation: CR
How discovered: O
Nature of condition: B
Precautionary procedure: K

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

What was found

AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORT SMELL AND FUMES IN CABIN IN CRUISE. PACKS ISOLATION VALVE ALL IN AUTO AS WERE RE CIRCULATION FANS. ENGINE 1 AND 2 BLEEDS ON, AUXILIARY POWER UNIT BLEED OFF. SUPPLY DUCT TEMPERATURES WERE HIGH. ABOVE 80 SUPPLY DUCTS TEMPERATURES WERE LOWERED IMMEDIATELY AND SMELL AND FUMES DECREASED COMMENSURATELY. SMELL FUMES WERE OBVIOUS AND EXTINGUISHED. **SUPPLEMENTAL REPORT REQUIRED** (OPEN)