A B767-200 in cruise declared an emergency and diverted due to extremely loud noise coming from the right center lavatory.

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Attributes
ACN	613825
Time
Date	200404
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight attendant : on duty
Qualification	flight attendant : currently qualified
ASRS Report	613825
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe cabin event other
Independent Detector	other other : person 1
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Passenger Human Performance Cabin Crew Human Performance Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

After takeoff, passenger used aft r-hand center lavatory. After flushing, a 'loud noise' occurred and became exaggerated as flight continued. Captain declared emergency when noise could not be stopped. Electrical failure was suspected. Fire trucks were visible when we landed. Callback conversation with reporter revealed the following information: the reporter stated the cause of the noise was reported to be a stuck valve in the waste water system.

Original NASA ASRS Text

Title: A B767-200 IN CRUISE DECLARED AN EMER AND DIVERTED DUE TO EXTREMELY LOUD NOISE COMING FROM THE R CTR LAVATORY.

Narrative: AFTER TKOF, PAX USED AFT R-HAND CTR LAVATORY. AFTER FLUSHING, A 'LOUD NOISE' OCCURRED AND BECAME EXAGGERATED AS FLT CONTINUED. CAPT DECLARED EMER WHEN NOISE COULD NOT BE STOPPED. ELECTRICAL FAILURE WAS SUSPECTED. FIRE TRUCKS WERE VISIBLE WHEN WE LANDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE NOISE WAS RPTED TO BE A STUCK VALVE IN THE WASTE WATER SYS.

Data retrieved from NASA's ASRS site as of July 2007 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.