Captain of a B757 took off with 1 air conditioning pack turned off causing the incorrect takeoff power data since there is no data for only 1 pack on.

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Attributes
ACN	458349
Time
Date	199912
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mhr.airport
State Reference	CA
Altitude	agl single value : 100
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17500 flight time type : 2000
ASRS Report	458349
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : less severe non adherence other
Independent Detector	aircraft equipment other aircraft equipment : engine power differential other flight crewa other flight crewb
Resolutory Action	other
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

At mather airport, clearance is obtained from sac approach control which services sac international. Usually we call approach control when we are ready for takeoff to obtain release. On this day approach called us and stated that we were released shortly after we began to taxi. We normally taxi with 1 air conditioning pack off due noise consideration in the cockpit. Prior to takeoff, both packs are turned on. Normally I check to assure that the aircraft is correctly configured for takeoff, ie, flaps, packs, trim, etc, when cleared for takeoff. I did this check when we were released, but elected to let the one pack remain off due to an extended taxi. The pack was not turned on prior to takeoff. This aircraft has takeoff data for packs off or packs on, but not one in each confign. This could have been prevented by following the procedures I normally use, rather than finding an exception.

Original NASA ASRS Text

Title: CAPT OF A B757 TOOK OFF WITH 1 AIR CONDITIONING PACK TURNED OFF CAUSING THE INCORRECT TKOF PWR DATA SINCE THERE IS NO DATA FOR ONLY 1 PACK ON.

Narrative: AT MATHER ARPT, CLRNC IS OBTAINED FROM SAC APCH CTL WHICH SVCS SAC INTL. USUALLY WE CALL APCH CTL WHEN WE ARE READY FOR TKOF TO OBTAIN RELEASE. ON THIS DAY APCH CALLED US AND STATED THAT WE WERE RELEASED SHORTLY AFTER WE BEGAN TO TAXI. WE NORMALLY TAXI WITH 1 AIR CONDITIONING PACK OFF DUE NOISE CONSIDERATION IN THE COCKPIT. PRIOR TO TKOF, BOTH PACKS ARE TURNED ON. NORMALLY I CHK TO ASSURE THAT THE ACFT IS CORRECTLY CONFIGURED FOR TKOF, IE, FLAPS, PACKS, TRIM, ETC, WHEN CLRED FOR TKOF. I DID THIS CHK WHEN WE WERE RELEASED, BUT ELECTED TO LET THE ONE PACK REMAIN OFF DUE TO AN EXTENDED TAXI. THE PACK WAS NOT TURNED ON PRIOR TO TKOF. THIS ACFT HAS TKOF DATA FOR PACKS OFF OR PACKS ON, BUT NOT ONE IN EACH CONFIGN. THIS COULD HAVE BEEN PREVENTED BY FOLLOWING THE PROCS I NORMALLY USE, RATHER THAN FINDING AN EXCEPTION.

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.