<< >> NASA ASRS Report 547898, May 2002

Unidentified vibration in-flight by the flight crew of a B737-800 after departure from mpto, first officer.

Attributes
ACN	547898
Time
Date	200205
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mpzl.artcc
State Reference	FO
Altitude	msl single value : 22000
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	547898
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : published procedure non adherence : company policies
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : unable other
Consequence	other Other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

On departure out of pty, we felt a slight vibration in the cockpit. It seemed to occur as we were entering icing conditions around FL220. The first officer's side is where the vibration was the strongest. No vibration in the control yoke or the rudder pedals -- just the side windows and the floor. At cruise, the vibration almost went away completely. On descent and with an increase in airspeed, the vibration became worse. We slowed and the vibration went away, but still noticeable. After landing, we called maintenance to have a look at the aircraft. On arrival at the gate, it was found that the door on the first officer's side for ground to cockpit communications during pushback had been left open. Maintenance inspected the door and no damage had occurred.

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Original NASA ASRS Text

Title: UNIDENTIFIED VIBRATION INFLT BY THE FLC OF A B737-800 AFTER DEP FROM MPTO, FO.

Narrative: ON DEP OUT OF PTY, WE FELT A SLIGHT VIBRATION IN THE COCKPIT. IT SEEMED TO OCCUR AS WE WERE ENTERING ICING CONDITIONS AROUND FL220. THE FO'S SIDE IS WHERE THE VIBRATION WAS THE STRONGEST. NO VIBRATION IN THE CTL YOKE OR THE RUDDER PEDALS -- JUST THE SIDE WINDOWS AND THE FLOOR. AT CRUISE, THE VIBRATION ALMOST WENT AWAY COMPLETELY. ON DSCNT AND WITH AN INCREASE IN AIRSPD, THE VIBRATION BECAME WORSE. WE SLOWED AND THE VIBRATION WENT AWAY, BUT STILL NOTICEABLE. AFTER LNDG, WE CALLED MAINT TO HAVE A LOOK AT THE ACFT. ON ARR AT THE GATE, IT WAS FOUND THAT THE DOOR ON THE FO'S SIDE FOR GND TO COCKPIT COMS DURING PUSHBACK HAD BEEN LEFT OPEN. MAINT INSPECTED THE DOOR AND NO DAMAGE HAD OCCURRED.

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.