Air carrier passenger reported sighting a 'piece of metal' blowing off the aircraft.

Attributes
ACN	254419
Time
Date	199310
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw tower : ffz
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 20300 flight time type : 13000
ASRS Report	254419
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On short final, a passenger reported seeing a piece of metal blow off the left wing. After landing, the left navigation light upper cover was missing.

Original NASA ASRS Text

Title: ACR PAX RPTED SIGHTING A 'PIECE OF METAL' BLOWING OFF THE ACFT.

Narrative: ON SHORT FINAL, A PAX RPTED SEEING A PIECE OF METAL BLOW OFF THE L WING. AFTER LNDG, THE L NAV LIGHT UPPER COVER WAS MISSING.

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.