A B737-400 on approach with flaps extended a passenger reported a wrench in the left wing flap well....

Attributes
ACN	698610
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-400
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
ASRS Report	698610
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : inspection performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

After landing while deplaning; a passenger approached my first officer while I was retrieving the paperwork for the next leg; and reported that on approach after we extended the flaps; he saw a wrench in the wing. My first officer asked where he was seated. The passenger was sitting in seat 18A. The first officer called line maintenance. The decision to extend the flaps and speed brakes was made. My copilot sat in seat 18A and observed the reported wrench. He then went outside the aircraft and pulled the wrench out of the wing. It was a 7/8 inch wrench with no other markings on it. He gave it to maintenance who completed the logbook signoff and we completed our assigned flight.

Original NASA ASRS Text

Title: A B737-400 ON APCH WITH FLAPS EXTENDED A PAX RPTED A WRENCH IN THE L WING FLAP WELL. WRENCH REMOVED.

Narrative: AFTER LNDG WHILE DEPLANING; A PAX APCHED MY FO WHILE I WAS RETRIEVING THE PAPERWORK FOR THE NEXT LEG; AND RPTED THAT ON APCH AFTER WE EXTENDED THE FLAPS; HE SAW A WRENCH IN THE WING. MY FO ASKED WHERE HE WAS SEATED. THE PAX WAS SITTING IN SEAT 18A. THE FO CALLED LINE MAINT. THE DECISION TO EXTEND THE FLAPS AND SPD BRAKES WAS MADE. MY COPLT SAT IN SEAT 18A AND OBSERVED THE RPTED WRENCH. HE THEN WENT OUTSIDE THE ACFT AND PULLED THE WRENCH OUT OF THE WING. IT WAS A 7/8 INCH WRENCH WITH NO OTHER MARKINGS ON IT. HE GAVE IT TO MAINT WHO COMPLETED THE LOGBOOK SIGNOFF AND WE COMPLETED OUR ASSIGNED FLT.

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

A B737-400 on approach with flaps extended a passenger reported a wrench in the left wing flap well. Wrench removed.