Narrative:

Normal approach to airport; gear down flaps 20 degrees commanded and received immediate trailing flaps disagree EICAS alert; master caution; etc. Executed visual missed approach to assess. After determining from QRH that flaps would remain at 20 degrees elected to divert to longer runway at ZZZ. Declared emergency and received clearance to ZZZ where conducted normal smooth 20 degree landing.

Google
 

Original NASA ASRS Text

Title: A B757-200ER FLIGHT CREW EXPERIENCED A TRAILING EDGE FLAP PROBLEM ON APPROACH AND AFTER RUNNING THE QRH ELECTED TO DIVERT TO A NEARBY AIRPORT WITH A LONGER RUNWAY.

Narrative: NORMAL APCH TO ARPT; GEAR DOWN FLAPS 20 DEGS COMMANDED AND RECEIVED IMMEDIATE TRAILING FLAPS DISAGREE EICAS ALERT; MASTER CAUTION; ETC. EXECUTED VISUAL MISSED APCH TO ASSESS. AFTER DETERMINING FROM QRH THAT FLAPS WOULD REMAIN AT 20 DEGS ELECTED TO DIVERT TO LONGER RWY AT ZZZ. DECLARED EMER AND RECEIVED CLRNC TO ZZZ WHERE CONDUCTED NORMAL SMOOTH 20 DEG LNDG.

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