A B727-200 experienced severe in-flight vibration caused by the left inboard aileron fluttering.

Attributes
ACN	350195
Time
Date	199610
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	350195
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	350968
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Aircraft came in for a light check, the work package contained an 'ea' to change the left inboard aileron quadrant casting. This change also became a routine maintenance card. Neither form contained any information about removal or reinstallation of cable quadrants. The quadrants were removed, the casting was replaced and the quadrants were reinstalled without any maintenance manual referenced on card. Upon reinstallation of quadrant a new pivot pin was installed. The old pivot pin had a bushing installed under the pin. The pin has steps on it and the bushing appears to be just another step on the pin. The new pin was installed without that bushing. The installation was brought back by inspection and the ailerons were rigged. No problem was noted during the rig. On the first flight after the light check the flight crew noticed a vibration on the aircraft. The so walked back in the aircraft and noticed the left inboard aileron was fluttering. Aircraft turned back and returned to the gate. Flight was canceled and aircraft was brought back to hangar. Panel below inboard quadrants was removed and upon inspection by mechanic the missing bushing was found. Mechanic replaced the missing bushing per maintenance manual. Rig and operations check of aileron was accomplished per maintenance manual. Rig checked ok. Closed aileron panel and aircraft was released for service. The mechanic signed off the logbook that he replaced worn bushing and rig and operations checked ok. Logbook entry was entered that way so as not to get the mechanic that reinstalled the quadrants in trouble as well as the inspector who bought it off. Aircraft was repaired in less than 1 hour and was ready for flight.

Original NASA ASRS Text

Title: A B727-200 EXPERIENCED SEVERE INFLT VIBRATION CAUSED BY THE L INBOARD AILERON FLUTTERING.

Narrative: ACFT CAME IN FOR A LIGHT CHK, THE WORK PACKAGE CONTAINED AN 'EA' TO CHANGE THE L INBOARD AILERON QUADRANT CASTING. THIS CHANGE ALSO BECAME A ROUTINE MAINT CARD. NEITHER FORM CONTAINED ANY INFO ABOUT REMOVAL OR REINSTALLATION OF CABLE QUADRANTS. THE QUADRANTS WERE REMOVED, THE CASTING WAS REPLACED AND THE QUADRANTS WERE REINSTALLED WITHOUT ANY MAINT MANUAL REFED ON CARD. UPON REINSTALLATION OF QUADRANT A NEW PIVOT PIN WAS INSTALLED. THE OLD PIVOT PIN HAD A BUSHING INSTALLED UNDER THE PIN. THE PIN HAS STEPS ON IT AND THE BUSHING APPEARS TO BE JUST ANOTHER STEP ON THE PIN. THE NEW PIN WAS INSTALLED WITHOUT THAT BUSHING. THE INSTALLATION WAS BROUGHT BACK BY INSPECTION AND THE AILERONS WERE RIGGED. NO PROB WAS NOTED DURING THE RIG. ON THE FIRST FLT AFTER THE LIGHT CHK THE FLC NOTICED A VIBRATION ON THE ACFT. THE SO WALKED BACK IN THE ACFT AND NOTICED THE L INBOARD AILERON WAS FLUTTERING. ACFT TURNED BACK AND RETURNED TO THE GATE. FLT WAS CANCELED AND ACFT WAS BROUGHT BACK TO HANGAR. PANEL BELOW INBOARD QUADRANTS WAS REMOVED AND UPON INSPECTION BY MECH THE MISSING BUSHING WAS FOUND. MECH REPLACED THE MISSING BUSHING PER MAINT MANUAL. RIG AND OPS CHK OF AILERON WAS ACCOMPLISHED PER MAINT MANUAL. RIG CHKED OK. CLOSED AILERON PANEL AND ACFT WAS RELEASED FOR SVC. THE MECH SIGNED OFF THE LOGBOOK THAT HE REPLACED WORN BUSHING AND RIG AND OPS CHKED OK. LOGBOOK ENTRY WAS ENTERED THAT WAY SO AS NOT TO GET THE MECH THAT REINSTALLED THE QUADRANTS IN TROUBLE AS WELL AS THE INSPECTOR WHO BOUGHT IT OFF. ACFT WAS REPAIRED IN LESS THAN 1 HR AND WAS READY FOR FLT.

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.