Flap malfunction induced by maintenance.

Attributes
ACN	319547
Time
Date	199510
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	agl bound lower : 0 agl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dca
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing other
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17000 flight time type : 8000
ASRS Report	319547
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Approach for landing dca, upon flap extension, inboard flaps failed to extend (0 degrees), outboard operated normal. Took vectors for 10 mins or so while we analyzed our situation. WX was 70 scattered 11 broken/overcast 3 mi landing south localizer DME runway 18 with GS inoperative, MDA 720 ft. Followed manual abnormal procedure which called for outboard flaps to 40 degrees and vref plus 20 KTS. We considered diverting for longer runway (ie bwi). Since we had a lot of fuel, I decided to try the approach at dca -- see how we broke out and how the aircraft felt at 143 KTS (vref plus 20 KTS). We broke out and landed without a problem turning off the runway at a normal turnoff. Familiarity with airport was also a positive factor. Note: this problem was actually self induced by maintenance as they'd just changed the right fuselage cowl covering the inboard flap jackscrew (elephant ear cowl). Seems as if the replacement cowl interfered with the jackscrew.

Original NASA ASRS Text

Title: FLAP MALFUNCTION INDUCED BY MAINT.

Narrative: APCH FOR LNDG DCA, UPON FLAP EXTENSION, INBOARD FLAPS FAILED TO EXTEND (0 DEGS), OUTBOARD OPERATED NORMAL. TOOK VECTORS FOR 10 MINS OR SO WHILE WE ANALYZED OUR SIT. WX WAS 70 SCATTERED 11 BROKEN/OVCST 3 MI LNDG S LOC DME RWY 18 WITH GS INOP, MDA 720 FT. FOLLOWED MANUAL ABNORMAL PROC WHICH CALLED FOR OUTBOARD FLAPS TO 40 DEGS AND VREF PLUS 20 KTS. WE CONSIDERED DIVERTING FOR LONGER RWY (IE BWI). SINCE WE HAD A LOT OF FUEL, I DECIDED TO TRY THE APCH AT DCA -- SEE HOW WE BROKE OUT AND HOW THE ACFT FELT AT 143 KTS (VREF PLUS 20 KTS). WE BROKE OUT AND LANDED WITHOUT A PROB TURNING OFF THE RWY AT A NORMAL TURNOFF. FAMILIARITY WITH ARPT WAS ALSO A POSITIVE FACTOR. NOTE: THIS PROB WAS ACTUALLY SELF INDUCED BY MAINT AS THEY'D JUST CHANGED THE R FUSELAGE COWL COVERING THE INBOARD FLAP JACKSCREW (ELEPHANT EAR COWL). SEEMS AS IF THE REPLACEMENT COWL INTERFERED WITH THE JACKSCREW.

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.