<< >> NASA ASRS Report 452200, October 1999

B737-200 mdw line maintenance deferred a non deferrable leading edge device. Aircraft flew 1 leg before discovery.

Attributes
ACN	452200
Time
Date	199910
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 255 flight time total : 23700 flight time type : 15000
ASRS Report	452200
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance maintenance problem : non compliance with mel non adherence : company policies non adherence : clearance non adherence : far non adherence : published procedure non adherence other
Independent Detector	aircraft equipment other aircraft equipment : warning light other flight crewa other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

The inbound crew put overhead leading edge flap #4 light on with disagreement light on forward panel on. The mechanic, as did I, interpreted it to be a #4 leading edge slat and deferred it. We flew the next leg before it was determined that it was not a deferrable item. The preamble of MEL states leading edge flaps and slats helped lead to the error.

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Original NASA ASRS Text

Title: B737-200 MDW LINE MAINT DEFERRED A NON DEFERRABLE LEADING EDGE DEVICE. ACFT FLEW 1 LEG BEFORE DISCOVERY.

Narrative: THE INBOUND CREW PUT OVERHEAD LEADING EDGE FLAP #4 LIGHT ON WITH DISAGREEMENT LIGHT ON FORWARD PANEL ON. THE MECH, AS DID I, INTERPRETED IT TO BE A #4 LEADING EDGE SLAT AND DEFERRED IT. WE FLEW THE NEXT LEG BEFORE IT WAS DETERMINED THAT IT WAS NOT A DEFERRABLE ITEM. THE PREAMBLE OF MEL STATES LEADING EDGE FLAPS AND SLATS HELPED LEAD TO THE ERROR.

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.