B737-300 crew had uncommanded roll during flap extension at ewr.

Attributes
ACN	558725
Time
Date	200208
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ewr.airport
State Reference	NJ
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ewr.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 4r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time total : 15000
ASRS Report	558725
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While slowing for approach to ewr, when flaps were extended from 5 degrees to 10 degrees at speed 180 KTS, autoplt and yoke rolled 2 1/2 degrees left. Autoplt and autothrottle were disengaged and captain took control of aircraft. Leading edge device position was verified (all extended and locked). Flap symmetry verified, fuel balance verified, power lever placement checked. Everything appeared normal. Aircraft was VFR under a broken layer about 20 NM from ewr on ILS runway 4R approach, configured for landing. When flaps were extended to 15 degrees, additional 2 degrees of roll occurred. Decision was made to rebug for flaps 15 degree landing -- and it was normal.

Original NASA ASRS Text

Title: B737-300 CREW HAD UNCOMMANDED ROLL DURING FLAP EXTENSION AT EWR.

Narrative: WHILE SLOWING FOR APCH TO EWR, WHEN FLAPS WERE EXTENDED FROM 5 DEGS TO 10 DEGS AT SPD 180 KTS, AUTOPLT AND YOKE ROLLED 2 1/2 DEGS L. AUTOPLT AND AUTOTHROTTLE WERE DISENGAGED AND CAPT TOOK CTL OF ACFT. LEADING EDGE DEVICE POS WAS VERIFIED (ALL EXTENDED AND LOCKED). FLAP SYMMETRY VERIFIED, FUEL BAL VERIFIED, PWR LEVER PLACEMENT CHKED. EVERYTHING APPEARED NORMAL. ACFT WAS VFR UNDER A BROKEN LAYER ABOUT 20 NM FROM EWR ON ILS RWY 4R APCH, CONFIGURED FOR LNDG. WHEN FLAPS WERE EXTENDED TO 15 DEGS, ADDITIONAL 2 DEGS OF ROLL OCCURRED. DECISION WAS MADE TO REBUG FOR FLAPS 15 DEG LNDG -- AND IT WAS NORMAL.

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.