<< >> NASA ASRS Report 130766, December 1989

Air carrier flight crew advised tower of possible inability to conform to SID restriction subsequent to receiving takeoff clearance.

Attributes
ACN	130766
Time
Date	198912
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : takeoff ground : holding
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
ASRS Report	130766
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	incursion : runway non adherence : clearance non adherence : published procedure
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After receipt of takeoff clearance on 32L at T1 intersection or ord, my first officer, as briefed, informed tower that the 3000' and 5 DME restriction would be uncertain because of our high gross weight. Only after receipt of the takeoff clearance and the climb out heading would we know which altitude restriction would apply. We were nearing 100 KTS (V1, 129 KTS) when ord tower told us to hold in position. Even though below V1, I elected to continue the takeoff because of no traffic conflict being imminent.

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Original NASA ASRS Text

Title: ACR FLT CREW ADVISED TWR OF POSSIBLE INABILITY TO CONFORM TO SID RESTRICTION SUBSEQUENT TO RECEIVING TKOF CLRNC.

Narrative: AFTER RECEIPT OF TKOF CLRNC ON 32L AT T1 INTXN OR ORD, MY F/O, AS BRIEFED, INFORMED TWR THAT THE 3000' AND 5 DME RESTRICTION WOULD BE UNCERTAIN BECAUSE OF OUR HIGH GROSS WT. ONLY AFTER RECEIPT OF THE TKOF CLRNC AND THE CLBOUT HDG WOULD WE KNOW WHICH ALT RESTRICTION WOULD APPLY. WE WERE NEARING 100 KTS (V1, 129 KTS) WHEN ORD TWR TOLD US TO HOLD IN POS. EVEN THOUGH BELOW V1, I ELECTED TO CONTINUE THE TKOF BECAUSE OF NO TFC CONFLICT BEING IMMINENT.

Data retrieved from NASA's ASRS site as of August 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.