B737-800 captain reported a fume event that resulted in a diversion.

Attributes
ACN	1759446
Time
Date	202009
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

During cruise; fas (flight attendants) and crewmembers/passengers reported strong odor in the aft cabin; with the strongest concentration in the aft galley. Smell was reported as both electrical burning and cloth burning. Advised ATC; and was cleared by ATC to start a descent and turn toward ZZZ and initiated the smoke; fire; or fumes qrc/QRH procedure. During the QRH procedure; turned off the right pack and called fas. All reported dissipation of the odors. Uneventful descent; approach; and landing at ZZZ uneventfully. Arff inspected the aircraft on the runway and followed taxi in to gate. No reports of illness or injury by the passengers or crewmembers.cause: unknown source; but likely a problem in the right side air cond system.

Original NASA ASRS Text

Title: B737-800 Captain reported a fume event that resulted in a diversion.

Narrative: During cruise; FAs (Flight Attendants) and crewmembers/passengers reported strong odor in the aft cabin; with the strongest concentration in the aft galley. Smell was reported as both electrical burning and cloth burning. Advised ATC; and was cleared by ATC to start a descent and turn toward ZZZ and initiated the SMOKE; FIRE; OR FUMES QRC/QRH procedure. During the QRH procedure; turned off the R PACK and called FAs. All reported dissipation of the odors. Uneventful descent; approach; and landing at ZZZ uneventfully. ARFF inspected the aircraft on the runway and followed taxi in to gate. No reports of illness or injury by the passengers or crewmembers.Cause: Unknown source; but likely a problem in the Right Side Air Cond system.

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.