A CRJ200 on the second flight leg had the lower cowl of the left engine depart the aircraft.

Attributes
ACN	680074
Time
Date	200512
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 6.5
ASRS Report	680074
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance
Situations
Publication	Maint Manual

Narrative:

Cold rushed to get the plane at gate. Panel tight to install appeared secure and passed two pilot's inspections. On second flight to ZZZ the cowl door departed from the aircraft.callback conversation with reporter revealed the following information: the reporter states the fasteners were installed and tested per the procedures and were inspected per the check documents prior to the gate delivery; and the cowl panels were again visually checked at the gate by the delivering tech and the first officer. The reporter indicated that prior to the second leg flight; the first officer visually checked the cowling and found no loose or missing fasteners; and on the second leg flight; the left lower cowling departed the aircraft. The reporter believes the camlocks were worn and vibrated loose. The reporter indicated that this is not the first failure of these fasteners as one cowling has previously been reported as departing the aircraft. Reporter noted frequent reports by crews of missing or loose fasteners are proof these worn fasteners are not being found and replaced on a routine basis.

Original NASA ASRS Text

Title: A CRJ200 ON THE SECOND FLT LEG HAD THE LOWER COWL OF THE L ENG DEPART THE ACFT.

Narrative: COLD RUSHED TO GET THE PLANE AT GATE. PANEL TIGHT TO INSTALL APPEARED SECURE AND PASSED TWO PLT'S INSPECTIONS. ON SECOND FLT TO ZZZ THE COWL DOOR DEPARTED FROM THE ACFT.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATES THE FASTENERS WERE INSTALLED AND TESTED PER THE PROCS AND WERE INSPECTED PER THE CHK DOCUMENTS PRIOR TO THE GATE DELIVERY; AND THE COWL PANELS WERE AGAIN VISUALLY CHKED AT THE GATE BY THE DELIVERING TECH AND THE FO. THE RPTR INDICATED THAT PRIOR TO THE SECOND LEG FLT; THE FO VISUALLY CHKED THE COWLING AND FOUND NO LOOSE OR MISSING FASTENERS; AND ON THE SECOND LEG FLT; THE L LOWER COWLING DEPARTED THE ACFT. THE RPTR BELIEVES THE CAMLOCKS WERE WORN AND VIBRATED LOOSE. THE RPTR INDICATED THAT THIS IS NOT THE FIRST FAILURE OF THESE FASTENERS AS ONE COWLING HAS PREVIOUSLY BEEN RPTED AS DEPARTING THE ACFT. RPTR NOTED FREQUENT RPTS BY CREWS OF MISSING OR LOOSE FASTENERS ARE PROOF THESE WORN FASTENERS ARE NOT BEING FOUND AND REPLACED ON A ROUTINE BASIS.

Data retrieved from NASA's ASRS site as of January 2009 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.