A B747-400 cabin attendant reports heavy condensation mist in first class cabin while on the ground....

Attributes
ACN	673712
Time
Date	200508
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight attendant : on duty
ASRS Report	673712
Person 2
Affiliation	company : air carrier
Function	flight attendant : on duty
Events
Anomaly	aircraft equipment problem : less severe cabin event other
Independent Detector	other other : 1
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Environmental Factor Cabin Crew Human Performance Airport
Primary Problem	Aircraft

Narrative:

While parked at gate; air conditioning in first and business produced condensation mist in cabin. From boarding door 1L; behind row 5; was unable to see forward from row 4 to row 1. Unable to see passenger; unable to see floor. From door 1L unable to see flight attendant at door 2L. Unable to see passenger in cabin. Was unable to see if overhead bins closed before door closure. Had to walk up and down and call flight attendants. Unable to see if passenger down for pushback. Had to walk up and down and call different cabins. Mist subsided after pushback then returned in the middle of safety demonstration. Passenger in 'B' zone were unable to see flight attendants performing demonstration. Captain had informed flight attendants to remain seated after takeoff due to possible WX. After takeoff; condensation dripped heavily on passenger in business and economy. Passenger started getting up with seatbelt sign off to escape water. Flight attendants in the back could not remain in seats. Too many passenger up. Was told this was due to humidity level in ZZZZ; but I have flown there many times. This is the only such incident I have witnessed. Other flight attendants told me that aircraft X was known to have this condensation and mist problem.

Original NASA ASRS Text

Title: A B747-400 CABIN ATTENDANT RPTS HVY CONDENSATION MIST IN FIRST CLASS CABIN WHILE ON THE GND. EXPLANATION OF CAUSE WAS HIGH HUMIDITY AT DEP ARPT.

Narrative: WHILE PARKED AT GATE; AIR CONDITIONING IN FIRST AND BUSINESS PRODUCED CONDENSATION MIST IN CABIN. FROM BOARDING DOOR 1L; BEHIND ROW 5; WAS UNABLE TO SEE FORWARD FROM ROW 4 TO ROW 1. UNABLE TO SEE PAX; UNABLE TO SEE FLOOR. FROM DOOR 1L UNABLE TO SEE FLT ATTENDANT AT DOOR 2L. UNABLE TO SEE PAX IN CABIN. WAS UNABLE TO SEE IF OVERHEAD BINS CLOSED BEFORE DOOR CLOSURE. HAD TO WALK UP AND DOWN AND CALL FLT ATTENDANTS. UNABLE TO SEE IF PAX DOWN FOR PUSHBACK. HAD TO WALK UP AND DOWN AND CALL DIFFERENT CABINS. MIST SUBSIDED AFTER PUSHBACK THEN RETURNED IN THE MIDDLE OF SAFETY DEMO. PAX IN 'B' ZONE WERE UNABLE TO SEE FLT ATTENDANTS PERFORMING DEMO. CAPT HAD INFORMED FLT ATTENDANTS TO REMAIN SEATED AFTER TKOF DUE TO POSSIBLE WX. AFTER TKOF; CONDENSATION DRIPPED HEAVILY ON PAX IN BUSINESS AND ECONOMY. PAX STARTED GETTING UP WITH SEATBELT SIGN OFF TO ESCAPE WATER. FLT ATTENDANTS IN THE BACK COULD NOT REMAIN IN SEATS. TOO MANY PAX UP. WAS TOLD THIS WAS DUE TO HUMIDITY LEVEL IN ZZZZ; BUT I HAVE FLOWN THERE MANY TIMES. THIS IS THE ONLY SUCH INCIDENT I HAVE WITNESSED. OTHER FLT ATTENDANTS TOLD ME THAT ACFT X WAS KNOWN TO HAVE THIS CONDENSATION AND MIST PROB.

Data retrieved from NASA's ASRS site as of January 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.

A B747-400 cabin attendant reports heavy condensation mist in first class cabin while on the ground. Explanation of cause was high humidity at departure airport.