A B767-300 in cruise diverted due to unidentifiable vibrations felt in the entire aircraft floor, caused by a failed aircraft cargo compartment vent fan.

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Attributes
ACN	539485
Time
Date	200202
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	msl single value : 33000
Aircraft 1
Controlling Facilities	artcc : zzz1.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	539485
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Experienced an unidentifiable vibration in the floor of the aircraft. Attempted to troubleshoot without success. Turned back to ZZZ. Callback conversation with reporter revealed the following information: the reporter stated the vibrations were felt throughout the cabin primarily in the floor and got progressively worse. The reporter said several systems were switched off to isolate the vibration, but without success and the decision was made to divert. The reporter stated on the ground maintenance found the aircraft cargo compartment vent fan had failed operation with the fan either unbalanced or rubbing the side of the case.

Original NASA ASRS Text

Title: A B767-300 IN CRUISE DIVERTED DUE TO UNIDENTIFIABLE VIBRATIONS FELT IN THE ENTIRE ACFT FLOOR, CAUSED BY A FAILED ACFT CARGO COMPARTMENT VENT FAN.

Narrative: EXPERIENCED AN UNIDENTIFIABLE VIBRATION IN THE FLOOR OF THE ACFT. ATTEMPTED TO TROUBLESHOOT WITHOUT SUCCESS. TURNED BACK TO ZZZ. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE VIBRATIONS WERE FELT THROUGHOUT THE CABIN PRIMARILY IN THE FLOOR AND GOT PROGRESSIVELY WORSE. THE RPTR SAID SEVERAL SYSTEMS WERE SWITCHED OFF TO ISOLATE THE VIBRATION, BUT WITHOUT SUCCESS AND THE DECISION WAS MADE TO DIVERT. THE RPTR STATED ON THE GND MAINT FOUND THE ACFT CARGO COMPARTMENT VENT FAN HAD FAILED OPERATION WITH THE FAN EITHER UNBALANCED OR RUBBING THE SIDE OF THE CASE.

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.