After performing routine overnight maintenance (ron); including removing and reinstalling engine cowls; a lower cowling departed a crj-200 aircraft on landing.

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Attributes
ACN	973971
Time
Date	201110
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Landing
Component
Aircraft Component	Cowling
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Person 2
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Routine overnight maintenance (ron). Cowls removed for maintenance; then re-installed. Number 1 engine lower [cowling] came off on landing. As far as I know; [cowling] reinstalled and returned to service. Suggest following company procedures. Do eddy current checks on cowls that are re-installed.

Original NASA ASRS Text

Title: After performing Routine Overnight Maintenance (RON); including removing and reinstalling engine cowls; a lower cowling departed a CRJ-200 aircraft on landing.

Narrative: Routine Overnight Maintenance (RON). Cowls removed for maintenance; then re-installed. Number 1 Engine lower [cowling] came off on landing. As far as I know; [cowling] reinstalled and returned to service. Suggest following company procedures. Do Eddy Current Checks on cowls that are re-installed.

Data retrieved from NASA's ASRS site as of April 2012 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.