DC9 crew departing lga accept runway with tailwind component.

Attributes
ACN	489359
Time
Date	200010
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 250 flight time total : 13000 flight time type : 1000
ASRS Report	489359
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	inflight encounter : weather non adherence : company policies non adherence : far
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued advisory
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Lga using runway 13 for takeoffs. ATIS 'P' calling winds 040 degree at 8 KTS, pushed back from gate at xa:41Z, approximately #10 in sequence for takeoff. When cleared into position and hold, tower advised wind now 340 degree at 15 KTS did not consult performance data to calculate tailwind component, instead did quick and rough mental calculation and concluded tailwind component was within limitations. Takeoff was normal. Later in flight, double checked performance charts and realized tailwind component was in excess of certificate aom limitations. Mistake was in allowing perceived ATC and schedule pressure to rush me into not consulting performance data and making mental miscalculation.

Original NASA ASRS Text

Title: DC9 CREW DEPARTING LGA ACCEPT RWY WITH TAILWIND COMPONENT.

Narrative: LGA USING RWY 13 FOR TKOFS. ATIS 'P' CALLING WINDS 040 DEGREE AT 8 KTS, PUSHED BACK FROM GATE AT XA:41Z, APPROX #10 IN SEQUENCE FOR TKOF. WHEN CLRED INTO POS AND HOLD, TWR ADVISED WIND NOW 340 DEGREE AT 15 KTS DID NOT CONSULT PERFORMANCE DATA TO CALCULATE TAILWIND COMPONENT, INSTEAD DID QUICK AND ROUGH MENTAL CALCULATION AND CONCLUDED TAILWIND COMPONENT WAS WITHIN LIMITATIONS. TKOF WAS NORMAL. LATER IN FLT, DOUBLE CHKED PERFORMANCE CHARTS AND REALIZED TAILWIND COMPONENT WAS IN EXCESS OF CERTIFICATE AOM LIMITATIONS. MISTAKE WAS IN ALLOWING PERCEIVED ATC AND SCHEDULE PRESSURE TO RUSH ME INTO NOT CONSULTING PERFORMANCE DATA AND MAKING MENTAL MISCALCULATION.

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.