A B747-400 on returning from test flight it was discovered a #4 pylon panel was missing.

Attributes
ACN	470377
Time
Date	200004
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 8
ASRS Report	470377
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector
Qualification	technician : airframe technician : powerplant
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other other : 969
Consequence	other
Factors
Maintenance	performance deficiency : inspection performance deficiency : scheduled maintenance performance deficiency : installation
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Installed blowout panel 472-gl on apr/xa/00 in place and sequenced. Inspector inspected on apr/xb/00 in place. Came in on test flight apr/xc/00 missing.

Original NASA ASRS Text

Title: A B747-400 ON RETURNING FROM TEST FLT IT WAS DISCOVERED A #4 PYLON PANEL WAS MISSING.

Narrative: INSTALLED BLOWOUT PANEL 472-GL ON APR/XA/00 IN PLACE AND SEQUENCED. INSPECTOR INSPECTED ON APR/XB/00 IN PLACE. CAME IN ON TEST FLT APR/XC/00 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.