A jetstream 4100 in climb at 1000 ft diverted due to right engine cowling coming open. On ground found latches can be false latched with no indication.

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Attributes
ACN	547877
Time
Date	200207
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : yip.tower
Operator	common carrier : air taxi
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2500 flight time type : 1500
ASRS Report	547877
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : diverted to another airport none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : inspection performance deficiency : testing
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Latches on right side cowling (engine) indicated closed and locked on preflight. However, opened after takeoff -- returned to airport and resecured cowling. Re-released and continued on flight XXX. Cowl remained closed which would indicate that even though latches indicate visually that they are engaged, additional checks are necessary to confirm engagement. Other tests were employed, ie, banging on the cowling. However, this procedure did not work either because latches were in the proper position but not engaging the latch mechanism.

Original NASA ASRS Text

Title: A JETSTREAM 4100 IN CLB AT 1000 FT DIVERTED DUE TO R ENG COWLING COMING OPEN. ON GND FOUND LATCHES CAN BE FALSE LATCHED WITH NO INDICATION.

Narrative: LATCHES ON R SIDE COWLING (ENG) INDICATED CLOSED AND LOCKED ON PREFLT. HOWEVER, OPENED AFTER TKOF -- RETURNED TO ARPT AND RESECURED COWLING. RE-RELEASED AND CONTINUED ON FLT XXX. COWL REMAINED CLOSED WHICH WOULD INDICATE THAT EVEN THOUGH LATCHES INDICATE VISUALLY THAT THEY ARE ENGAGED, ADDITIONAL CHKS ARE NECESSARY TO CONFIRM ENGAGEMENT. OTHER TESTS WERE EMPLOYED, IE, BANGING ON THE COWLING. HOWEVER, THIS PROC DID NOT WORK EITHER BECAUSE LATCHES WERE IN THE PROPER POS BUT NOT ENGAGING THE LATCH MECHANISM.

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.