An air carrier captain reported that an unidentifiable odor was reported by the flight attendant to the captain during taxi. The captain returned to the gate and the TCASII processor unit was replaced.

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Attributes
ACN	487350
Time
Date	200010
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit.airport
State Reference	PA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pit.tower
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 1100
ASRS Report	487350
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other other : 3
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Just prior to takeoff, pit-bna, forward flight attendants reported unidentifiable odor at their jump seat station. After a brief discussion, aircraft was taxied back to gate. The odor was brief in duration and disappeared during taxi in. Maintenance replaced the TCASII processor unit and inspected aircraft. Flight departed 1 hour late to bna with no further problems.

Original NASA ASRS Text

Title: AN ACR CAPT RPTED THAT AN UNIDENTIFIABLE ODOR WAS RPTED BY THE FLT ATTENDANT TO THE CAPT DURING TAXI. THE CAPT RETURNED TO THE GATE AND THE TCASII PROCESSOR UNIT WAS REPLACED.

Narrative: JUST PRIOR TO TKOF, PIT-BNA, FORWARD FLT ATTENDANTS RPTED UNIDENTIFIABLE ODOR AT THEIR JUMP SEAT STATION. AFTER A BRIEF DISCUSSION, ACFT WAS TAXIED BACK TO GATE. THE ODOR WAS BRIEF IN DURATION AND DISAPPEARED DURING TAXI IN. MAINT REPLACED THE TCASII PROCESSOR UNIT AND INSPECTED ACFT. FLT DEPARTED 1 HR LATE TO BNA WITH NO FURTHER PROBS.

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.