<< >> NASA ASRS Report 413636, September 1998

An EMB120 in climb at 11000 ft declared an emergency and diverted due to a left engine duct leak warning which required in-flight shutdown of the engine caused by a defective sensor.

Attributes
ACN	413636
Time
Date	199809
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : day
State Reference	OH
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 5600 flight time type : 750
ASRS Report	413636
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 2600 flight time type : 100
ASRS Report	413740
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During climb and passing through 11000 ft, received left engine duct leak warning. Using abnormal procedures checklist, the left engine bleed was closed but did not eliminate the warning. Checklist instructed a left engine shutdown which was accomplished. An emergency was declared with ATC, a diversion to dayton initiated, flight attendant and passenger informed. Approach and landing to runway 18 was accomplished without incident and passenger eventually deplaned at the gate. Callback conversation with reporter revealed the following information: the reporter stated that maintenance advised the cause of the false warning was a defective sensor loop and no pneumatic duct leaking was found. Callback conversation with reporter acn 413740 revealed the following information: the reporter stated that the cause of the duct leak warning is unknown as maintenance has made no contact with the reporter since the incident.

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Original NASA ASRS Text

Title: AN EMB120 IN CLB AT 11000 FT DECLARED AN EMER AND DIVERTED DUE TO A L ENG DUCT LEAK WARNING WHICH REQUIRED INFLT SHUTDOWN OF THE ENG CAUSED BY A DEFECTIVE SENSOR.

Narrative: DURING CLB AND PASSING THROUGH 11000 FT, RECEIVED L ENG DUCT LEAK WARNING. USING ABNORMAL PROCS CHKLIST, THE L ENG BLEED WAS CLOSED BUT DID NOT ELIMINATE THE WARNING. CHKLIST INSTRUCTED A L ENG SHUTDOWN WHICH WAS ACCOMPLISHED. AN EMER WAS DECLARED WITH ATC, A DIVERSION TO DAYTON INITIATED, FLT ATTENDANT AND PAX INFORMED. APCH AND LNDG TO RWY 18 WAS ACCOMPLISHED WITHOUT INCIDENT AND PAX EVENTUALLY DEPLANED AT THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT MAINT ADVISED THE CAUSE OF THE FALSE WARNING WAS A DEFECTIVE SENSOR LOOP AND NO PNEUMATIC DUCT LEAKING WAS FOUND. CALLBACK CONVERSATION WITH RPTR ACN 413740 REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE CAUSE OF THE DUCT LEAK WARNING IS UNKNOWN AS MAINT HAS MADE NO CONTACT WITH THE RPTR SINCE THE INCIDENT.

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.