<< >> NASA ASRS Report 728026, February 2007

A B757-200 at FL340 over psp returned to the departure airport due to burned odor from captain's vent. Shut down left pack and odor dissipated.

Attributes
ACN	728026
Time
Date	200702
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : psp.airport
State Reference	CA
Altitude	agl single value : 340
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	728026
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Just prior to passing over psp we smelt a burnt odor coming from the captain's vent that appeared intermittently. We proceeded per the air conditioning smoke QRH. Coordination with phx and based on the situation and aircraft history the left pack was left shut down. No smoke was smelt after the left pack was shut down. The problem being isolated we returned to phx and went into holding to burn fuel down. During holding we also noticed in the left corner of the captain's fwd window that there had been some arcing and suspect that may have actually been a contributing cause.

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Original NASA ASRS Text

Title: A B757-200 AT FL340 OVER PSP RETURNED TO THE DEP ARPT DUE TO BURNED ODOR FROM CAPT'S VENT. SHUT DOWN L PACK AND ODOR DISSIPATED.

Narrative: JUST PRIOR TO PASSING OVER PSP WE SMELT A BURNT ODOR COMING FROM THE CAPT'S VENT THAT APPEARED INTERMITTENTLY. WE PROCEEDED PER THE AIR CONDITIONING SMOKE QRH. COORD WITH PHX AND BASED ON THE SITUATION AND ACFT HISTORY THE L PACK WAS LEFT SHUT DOWN. NO SMOKE WAS SMELT AFTER THE L PACK WAS SHUT DOWN. THE PROBLEM BEING ISOLATED WE RETURNED TO PHX AND WENT INTO HOLDING TO BURN FUEL DOWN. DURING HOLDING WE ALSO NOTICED IN THE L CORNER OF THE CAPT'S FWD WINDOW THAT THERE HAD BEEN SOME ARCING AND SUSPECT THAT MAY HAVE ACTUALLY BEEN A CONTRIBUTING CAUSE.

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.