An air carrier widebody transport aircraft lost a fixed lower landing gear door while in-flight.

Attributes
ACN	370625
Time
Date	199705
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : amg
State Reference	GA
Altitude	msl bound lower : 28500 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 205 flight time total : 9500 flight time type : 2300
ASRS Report	370625
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While climbing to FL290, a loud thump was felt on the left side of the aircraft as it was leaving 28500 ft. All engine and flight instruments were normal. The captain sent me back to check the wing upper surfaces and cabin. A slight vibration was felt around the floor area at seat row xx-yy. The flight proceeded to st louis at FL290 mach .80. A normal approach and landing was made. Maintenance had been notified when in range. When maintenance checked the aircraft, the fixed lower gear door (left side) was missing and some damage to the under side of the wing was noted.

Original NASA ASRS Text

Title: AN ACR WDB ACFT LOST A FIXED LOWER LNDG GEAR DOOR WHILE INFLT.

Narrative: WHILE CLBING TO FL290, A LOUD THUMP WAS FELT ON THE L SIDE OF THE ACFT AS IT WAS LEAVING 28500 FT. ALL ENG AND FLT INSTS WERE NORMAL. THE CAPT SENT ME BACK TO CHK THE WING UPPER SURFACES AND CABIN. A SLIGHT VIBRATION WAS FELT AROUND THE FLOOR AREA AT SEAT ROW XX-YY. THE FLT PROCEEDED TO ST LOUIS AT FL290 MACH .80. A NORMAL APCH AND LNDG WAS MADE. MAINT HAD BEEN NOTIFIED WHEN IN RANGE. WHEN MAINT CHKED THE ACFT, THE FIXED LOWER GEAR DOOR (L SIDE) WAS MISSING AND SOME DAMAGE TO THE UNDER SIDE OF THE WING WAS NOTED.

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.