B737 first officer reported a diversion due to strong electrical odor near the aft lavatory.

Attributes
ACN	1535350
Time
Date	201804
Place
Locale Reference	MMFR.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Type 1310
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

After departing cancun; the flight attendants called to advise us of a burning odor coming from somewhere near the aft lavatory. They reported no smoke; but a strong electrical odor. We began running the smoke; fire; fumes checklist in the QRH. Periodically; the procedure had us stop and wait to see if the fumes increased or decreased. Each time the flight attendant (flight attendant) reported the odor seemed to be getting stronger. We ultimately reached the point in the procedure where a divert to the nearest field was directed. We [advised ATC]; began the divert to an alternate airport; ran the diversion checklist in the quick reference guide and landed uneventfully.

Original NASA ASRS Text

Title: B737 First Officer reported a diversion due to strong electrical odor near the aft lavatory.

Narrative: After departing Cancun; the Flight Attendants called to advise us of a burning odor coming from somewhere near the aft lavatory. They reported no smoke; but a strong electrical odor. We began running the Smoke; Fire; Fumes checklist in the QRH. Periodically; the procedure had us stop and wait to see if the fumes increased or decreased. Each time the FA (Flight Attendant) reported the odor seemed to be getting stronger. We ultimately reached the point in the procedure where a divert to the nearest field was directed. We [advised ATC]; began the divert to an alternate airport; ran the Diversion Checklist in the Quick Reference Guide and landed uneventfully.

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.