Commuter aircraft hears thump from cabin on visual approach. Cracked window.

Attributes
ACN	288494
Time
Date	199410
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lrp airport : mdt
State Reference	PA
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : mdt
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 6300 flight time type : 1300
ASRS Report	288494
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Passing through approximately 6000 ft on a vector for the visual approach to runway 13 at mdt, the crew heard a 'thump' which sounded like someone dropping a heavy object in the aisle. All instrument readings and flight control responses appeared normal. Since we were so close to final we continued with the visual approach and landed without incident. On a postflt inspection we found that the exterior pane on window 3C was cracked. Contract maintenance was called out for repair.

Original NASA ASRS Text

Title: COMMUTER ACFT HEARS THUMP FROM CABIN ON VISUAL APCH. CRACKED WINDOW.

Narrative: PASSING THROUGH APPROX 6000 FT ON A VECTOR FOR THE VISUAL APCH TO RWY 13 AT MDT, THE CREW HEARD A 'THUMP' WHICH SOUNDED LIKE SOMEONE DROPPING A HVY OBJECT IN THE AISLE. ALL INST READINGS AND FLT CTL RESPONSES APPEARED NORMAL. SINCE WE WERE SO CLOSE TO FINAL WE CONTINUED WITH THE VISUAL APCH AND LANDED WITHOUT INCIDENT. ON A POSTFLT INSPECTION WE FOUND THAT THE EXTERIOR PANE ON WINDOW 3C WAS CRACKED. CONTRACT MAINT WAS CALLED OUT FOR REPAIR.

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.