Narrative:

On taxi out flight attendants in aft galley notified cockpit that aft galley water faucets were trickling water. Contacted maintenance and they felt that water would stop once airborne and pressurized. After takeoff during climb out; flight attendants reported water was flowing out of faucets and water was also accumulating on galley tech carts which require electricity. Flight attendants could not determine the source of water accumulation. Shortly after this; still climbing to cruise altitude; flight attendants reported that water had stopped flowing but there was now no water at all in any lavatory or galley faucet. Coffee makers also indicated no water. Potable water gauge was fluctuating between 140 and 80 gals. Contacted maintenance control and was advised to try to cycle water shutoff valve in aft galley area. Valve was cycled with no change in situation. Decision was made to return. Supplemental information from acn 794255: after approximately 1 hour while en route to ZZZZ the aircraft had a malfunction of the potable and/or lavatory water system. After consultation with dispatch and maintenance control; a return to ZZZ was accomplished; requiring an overweight landing. The landing was made uneventfully by the first officer. While taxiing in; one of the brake temperature indicators reached level 7 and the 'brake temperature' light displayed on the forward instrument panel. After block in we ran the procedure in the limits section of the flight manual. After 15 mins of cooling; the hot brake cooled to 4 and the 'brake temperature' extinguished; requiring no further action per the procedure. Maintenance was notified.

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Original NASA ASRS Text

Title: B767 FLT CREW REPORTS WATER LEAKS IN CABIN THEN WATER SYSTEM FAILURE. FLT CREW RETURNS FOR OVERWEIGHT LANDING.

Narrative: ON TAXI OUT FLT ATTENDANTS IN AFT GALLEY NOTIFIED COCKPIT THAT AFT GALLEY WATER FAUCETS WERE TRICKLING WATER. CONTACTED MAINT AND THEY FELT THAT WATER WOULD STOP ONCE AIRBORNE AND PRESSURIZED. AFTER TKOF DURING CLBOUT; FLT ATTENDANTS RPTED WATER WAS FLOWING OUT OF FAUCETS AND WATER WAS ALSO ACCUMULATING ON GALLEY TECH CARTS WHICH REQUIRE ELECTRICITY. FLT ATTENDANTS COULD NOT DETERMINE THE SOURCE OF WATER ACCUMULATION. SHORTLY AFTER THIS; STILL CLBING TO CRUISE ALT; FLT ATTENDANTS RPTED THAT WATER HAD STOPPED FLOWING BUT THERE WAS NOW NO WATER AT ALL IN ANY LAVATORY OR GALLEY FAUCET. COFFEE MAKERS ALSO INDICATED NO WATER. POTABLE WATER GAUGE WAS FLUCTUATING BTWN 140 AND 80 GALS. CONTACTED MAINT CTL AND WAS ADVISED TO TRY TO CYCLE WATER SHUTOFF VALVE IN AFT GALLEY AREA. VALVE WAS CYCLED WITH NO CHANGE IN SITUATION. DECISION WAS MADE TO RETURN. SUPPLEMENTAL INFO FROM ACN 794255: AFTER APPROX 1 HR WHILE ENRTE TO ZZZZ THE ACFT HAD A MALFUNCTION OF THE POTABLE AND/OR LAVATORY WATER SYS. AFTER CONSULTATION WITH DISPATCH AND MAINT CTL; A RETURN TO ZZZ WAS ACCOMPLISHED; REQUIRING AN OVERWT LNDG. THE LNDG WAS MADE UNEVENTFULLY BY THE FO. WHILE TAXIING IN; ONE OF THE BRAKE TEMP INDICATORS REACHED LEVEL 7 AND THE 'BRAKE TEMP' LIGHT DISPLAYED ON THE FORWARD INST PANEL. AFTER BLOCK IN WE RAN THE PROC IN THE LIMITS SECTION OF THE FLT MANUAL. AFTER 15 MINS OF COOLING; THE HOT BRAKE COOLED TO 4 AND THE 'BRAKE TEMP' EXTINGUISHED; REQUIRING NO FURTHER ACTION PER THE PROC. MAINT WAS NOTIFIED.

Data retrieved from NASA's ASRS site as of May 2009 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.