<< >> NASA ASRS Report 438208, May 1999

Leading edge flap in transit light remains on in flaps 1 degree position. Extension to flap position greater than 1 operation was normal.

Attributes
ACN	438208
Time
Date	199905
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : djb.vortac
State Reference	OH
Altitude	msl single value : 7000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : atp pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 175 flight time total : 4800 flight time type : 250
ASRS Report	438208
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated flight crew : landed in emergency condition
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Leading edge flap in transit light remained on with flaps selected to 1 degree. Performed abnormal checklist and declared a precautionary emergency with ATC. With additional flap extension, flap indication returned to normal and subsequently performed a normal flaps 30 degree landing. Found cause to be flap handle stuck just outside of detent. CRM was textbook. We took our time with great results. Callback conversation with reporter revealed the following information: reporter indicated it was very possible that the flap handle was not seated in the detent as the flaps operated normally thereafter. This flight crew was made up of pilots new to the aircraft and just out of training. The reporter stated, in retrospect, that perhaps the declaration of an emergency was an overreaction.

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Original NASA ASRS Text

Title: LEADING EDGE FLAP IN TRANSIT LIGHT REMAINS ON IN FLAPS 1 DEG POS. EXTENSION TO FLAP POS GREATER THAN 1 OP WAS NORMAL.

Narrative: LEADING EDGE FLAP IN TRANSIT LIGHT REMAINED ON WITH FLAPS SELECTED TO 1 DEG. PERFORMED ABNORMAL CHKLIST AND DECLARED A PRECAUTIONARY EMER WITH ATC. WITH ADDITIONAL FLAP EXTENSION, FLAP INDICATION RETURNED TO NORMAL AND SUBSEQUENTLY PERFORMED A NORMAL FLAPS 30 DEG LNDG. FOUND CAUSE TO BE FLAP HANDLE STUCK JUST OUTSIDE OF DETENT. CRM WAS TEXTBOOK. WE TOOK OUR TIME WITH GREAT RESULTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATED IT WAS VERY POSSIBLE THAT THE FLAP HANDLE WAS NOT SEATED IN THE DETENT AS THE FLAPS OPERATED NORMALLY THEREAFTER. THIS FLC WAS MADE UP OF PLTS NEW TO THE ACFT AND JUST OUT OF TRAINING. THE RPTR STATED, IN RETROSPECT, THAT PERHAPS THE DECLARATION OF AN EMER WAS AN OVERREACTION.

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.