B737 ng flight crew reported flight attendant notification of cabin electrical fumes and associated ...

Attributes
ACN	1690727
Time
Date	201910
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 117 Flight Crew Total 18000 Flight Crew Type 1280
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 120
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

While in cruise flight at FL340; a flight attendant called and asked for the main cabin to be cooled down. I noticed that the cabin duct temperature had gotten to 25 degrees C. I turned the passenger cabin temperature to cooler. Not long after that the flight attendant calls back and says she sees and smells smoke around the exit row that filled the ceiling. The passengers noted this as well. She described it as a fine mist that smelled like electrical wires burning. The captain then went back to investigate. He could also smell the burning smell but the smoke had dissipated. After he returned to the cockpit we discussed returning to ZZZ or going to ZZZ1. We decided to do a bit of troubleshooting to be able to give maintenance more information when we landed. Since we had been using the engine anti ice during climb we wondered if the smell had come from that system. The captain then went back into the cabin and gave a signal to the flight attendant for me to turn the anti-ice back on so he could observe whether there was any more smoke or smell. He did notice some additional smoke and burning smell. After he returned to the cockpit he [notified ATC] and coordinated with dispatch to divert to ZZZ1. We requested that the fire trucks be waiting for us. We landed in ZZZ1 about 25 minutes later with no incident.

Original NASA ASRS Text

Title: B737 NG flight crew reported Flight Attendant notification of cabin electrical fumes and associated smoke in passenger cabin. After troubleshooting with no results; aircraft executed an uneventful diversion.

Narrative: While in cruise flight at FL340; a flight attendant called and asked for the main cabin to be cooled down. I noticed that the cabin duct temperature had gotten to 25 degrees C. I turned the passenger cabin temperature to cooler. Not long after that the flight attendant calls back and says she sees and smells smoke around the exit row that filled the ceiling. The passengers noted this as well. She described it as a fine mist that smelled like electrical wires burning. The Captain then went back to investigate. He could also smell the burning smell but the smoke had dissipated. After he returned to the cockpit we discussed returning to ZZZ or going to ZZZ1. We decided to do a bit of troubleshooting to be able to give maintenance more information when we landed. Since we had been using the engine anti ice during climb we wondered if the smell had come from that system. The Captain then went back into the cabin and gave a signal to the flight attendant for me to turn the anti-ice back on so he could observe whether there was any more smoke or smell. He did notice some additional smoke and burning smell. After he returned to the cockpit he [notified ATC] and coordinated with Dispatch to divert to ZZZ1. We requested that the fire trucks be waiting for us. We landed in ZZZ1 about 25 minutes later with no incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737 ng flight crew reported flight attendant notification of cabin electrical fumes and associated smoke in passenger cabin. After troubleshooting with no results; aircraft executed an uneventful diversion.