Diversion to alternate airport by air carrier medium large transport after flap asymmetry problem ar...

Attributes
ACN	217640
Time
Date	199208
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dca
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing : go around other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 7400 flight time type : 800
ASRS Report	217640
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Flight from bos - dca was normal until being cleared for river visual runway 18 dca. At approximately 10 DME on dca 238 degree radial, PF -- first officer called for flaps to 8 degrees. Immediately, a flap asymmetry warning alert was annunciated on MFDU. The captain assumed control of the aircraft and we advised ATC we would be unable to land at dca (min runway length with flaps less than 25 degrees requires min 7700 ft) and requested vectors for bwi. The pilot operating handbook was reviewed using appropriate abnormal checklists(flap asymmetry, landing with flaps less than 25 degrees). The emergency equipment was requested but not required as an uneventful flaps-up landing was made at bwi. The captain used excellent cockpit resource management procedures by taking control of the aircraft and the situation while delegating tasks and being receptive to suggestions and inputs of the first officer as well as other crew members.

Original NASA ASRS Text

Title: DIVERSION TO ALTERNATE ARPT BY ACR MLG AFTER FLAP ASYMMETRY PROBLEM ARISES.

Narrative: FLT FROM BOS - DCA WAS NORMAL UNTIL BEING CLRED FOR RIVER VISUAL RWY 18 DCA. AT APPROX 10 DME ON DCA 238 DEG RADIAL, PF -- FO CALLED FOR FLAPS TO 8 DEGS. IMMEDIATELY, A FLAP ASYMMETRY WARNING ALERT WAS ANNUNCIATED ON MFDU. THE CAPT ASSUMED CTL OF THE ACFT AND WE ADVISED ATC WE WOULD BE UNABLE TO LAND AT DCA (MIN RWY LENGTH WITH FLAPS LESS THAN 25 DEGS REQUIRES MIN 7700 FT) AND REQUESTED VECTORS FOR BWI. THE PLT OPERATING HANDBOOK WAS REVIEWED USING APPROPRIATE ABNORMAL CHKLISTS(FLAP ASYMMETRY, LNDG WITH FLAPS LESS THAN 25 DEGS). THE EMER EQUIP WAS REQUESTED BUT NOT REQUIRED AS AN UNEVENTFUL FLAPS-UP LNDG WAS MADE AT BWI. THE CAPT USED EXCELLENT COCKPIT RESOURCE MGMNT PROCS BY TAKING CTL OF THE ACFT AND THE SITUATION WHILE DELEGATING TASKS AND BEING RECEPTIVE TO SUGGESTIONS AND INPUTS OF THE FO AS WELL AS OTHER CREW MEMBERS.

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.

Diversion to alternate airport by air carrier medium large transport after flap asymmetry problem arises.