Narrative:

Paris, france, cdg, taxi out to runway 28. Observed taxiway 28.2 closed. Takeoff from taxiway 28 intersection with runway 28 required. Noted accuload data (company prepared weight and balance sheet) indicated runway 28 length = 13829 ft, flap setting 7.4 degrees. Radioed cdg station, requested verification of accuload data as takeoff was being made from taxiway 28 intersection. After 2 mins, cdg station verified that was the 'correct data for runway 28 today.' crew meanwhile researched takeoff data for runway 27 (11600 ft) indicated flaps 15.8 degrees. Crew discussed using data for runway 27 as depicted length appeared to be similar to runway 28, intersection 28, remaining length, even though cdg station had verified accuload data we had was correct. In an effort to 'keep it by the book' we departed with flaps 7.4 degrees, rotated at the runway 28 departure end, narrowly missing threshold lights. Recommendations: 1) company operations verify and use correct intersection takeoff data at cdg. 2) pilots should allow common sense to override obviously incorrect information, ie, safer to use runway 27 data (flaps 15 degrees) even though that would not have been 'by the book.' 3) pilots and air carrier operations should be aware of extremely safety-critical nature of last 2 mins prior to takeoff roll. Do not 'set pilots up' with wrong takeoff data. ATC awareness that crew requested delays at hold short line are serious, comply without pressure, ie, 'if no takeoff in 30 seconds then you will incur long delay.' be vigilant: common sense and pilot experience may be required to override 'wrong, but verified data!'

Related reports:

Google
 

Original NASA ASRS Text

Title: DC10 CREW USED ERRONEOUS TKOF DATA FOR DEP AT CDG.

Narrative: PARIS, FRANCE, CDG, TAXI OUT TO RWY 28. OBSERVED TXWY 28.2 CLOSED. TKOF FROM TXWY 28 INTXN WITH RWY 28 REQUIRED. NOTED ACCULOAD DATA (COMPANY PREPARED WT AND BAL SHEET) INDICATED RWY 28 LENGTH = 13829 FT, FLAP SETTING 7.4 DEGS. RADIOED CDG STATION, REQUESTED VERIFICATION OF ACCULOAD DATA AS TKOF WAS BEING MADE FROM TXWY 28 INTXN. AFTER 2 MINS, CDG STATION VERIFIED THAT WAS THE 'CORRECT DATA FOR RWY 28 TODAY.' CREW MEANWHILE RESEARCHED TKOF DATA FOR RWY 27 (11600 FT) INDICATED FLAPS 15.8 DEGS. CREW DISCUSSED USING DATA FOR RWY 27 AS DEPICTED LENGTH APPEARED TO BE SIMILAR TO RWY 28, INTXN 28, REMAINING LENGTH, EVEN THOUGH CDG STATION HAD VERIFIED ACCULOAD DATA WE HAD WAS CORRECT. IN AN EFFORT TO 'KEEP IT BY THE BOOK' WE DEPARTED WITH FLAPS 7.4 DEGS, ROTATED AT THE RWY 28 DEP END, NARROWLY MISSING THRESHOLD LIGHTS. RECOMMENDATIONS: 1) COMPANY OPS VERIFY AND USE CORRECT INTXN TKOF DATA AT CDG. 2) PLTS SHOULD ALLOW COMMON SENSE TO OVERRIDE OBVIOUSLY INCORRECT INFO, IE, SAFER TO USE RWY 27 DATA (FLAPS 15 DEGS) EVEN THOUGH THAT WOULD NOT HAVE BEEN 'BY THE BOOK.' 3) PLTS AND ACR OPS SHOULD BE AWARE OF EXTREMELY SAFETY-CRITICAL NATURE OF LAST 2 MINS PRIOR TO TKOF ROLL. DO NOT 'SET PLTS UP' WITH WRONG TKOF DATA. ATC AWARENESS THAT CREW REQUESTED DELAYS AT HOLD SHORT LINE ARE SERIOUS, COMPLY WITHOUT PRESSURE, IE, 'IF NO TKOF IN 30 SECONDS THEN YOU WILL INCUR LONG DELAY.' BE VIGILANT: COMMON SENSE AND PLT EXPERIENCE MAY BE REQUIRED TO OVERRIDE 'WRONG, BUT VERIFIED DATA!'

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.