Narrative:

After pushback had air system malfunction. Completed maintenance procedures and added MEL 36-23 (manf fail det loop). On takeoff roll got master caution and bleeds not off alert. Rejected to < 80 kts. Consulted maintenance control by phone and was advised to return to gate. Attempted second takeoff under MEL 21-08 (esc auto mode). Rejected takeoff <80 kts for same alert. Returned to gate for further trouble shooting. After extensive review of MEL; aircraft systems manual; FMS manual; and pilot handbook I discovered I had missed a step in the MEL operations procedures and that this oversight was the probable cause for the alert on the second takeoff attempt. Advised mx; consulted with dispatch and maintenance control; then performed a normal; air system manual preflight and takeoff.the predeparture maintenance process should have driven us to return to gate rather than attempt troubleshoot over the phone. Change verbiage in MEL 21-08. Under ops notes (O); 3.a and B should read 3.a on the performance computer - takeoff input screen select 'air conditioning...packs on.' 3.B on the FMS 'takeoff' page select 'packs-on.'note: the default value is 'packs-off' which will cause a 'bleeds not off' alert when takeoff power is set and any bleed is not manually turned to off. Ultimately; the second rejected takeoff could have been prevented by closer scrutiny and confirmation that all MEL procedures were complied with. In addition; MEL 36-23 (manf fail det loop) should state plainly that this MEL only applies when MEL 28-08 is also applied.

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Original NASA ASRS Text

Title: MD11 flight crew experienced an air system malfunction after pushback. Added the appropriate MEL according to Maintenance Control and received a master caution for bleeds not off when during takeoff followed by RTO. After returning to the gate and consulting with Maintenance; a different MEL was applied; but the crew did not properly configure the performance computer and FMS for operation under this MEL resulting in another RTO for the same master caution. After careful scrutiny; the correct MEL and procedures were performed with no master cautions generated during takeoff.

Narrative: After pushback had air system malfunction. Completed maintenance procedures and added MEL 36-23 (Manf Fail Det Loop). On takeoff roll got Master Caution and BLEEDS NOT OFF alert. Rejected TO < 80 kts. Consulted Maintenance Control by phone and was advised to return to gate. Attempted second takeoff under MEL 21-08 (ESC Auto Mode). RTO <80 kts for same alert. Returned to gate for further trouble shooting. After extensive review of MEL; Aircraft Systems Manual; FMS manual; and Pilot Handbook I discovered I had missed a step in the MEL operations procedures and that this oversight was the probable cause for the alert on the second takeoff attempt. Advised MX; consulted with Dispatch and Maintenance Control; then performed a normal; Air System Manual preflight and takeoff.The Predeparture Maintenance process should have driven us to return to gate rather than attempt troubleshoot over the phone. Change verbiage in MEL 21-08. Under Ops notes (O); 3.A and B should read 3.A On the Performance Computer - Takeoff Input Screen select 'AIR CONDITIONING...PACKS ON.' 3.B On the FMS 'Takeoff' Page select 'PACKS-ON.'Note: The default value is 'PACKS-OFF' which will cause a 'BLEEDS NOT OFF' alert when Takeoff power is set and any bleed is not manually turned to OFF. Ultimately; the second RTO could have been prevented by closer scrutiny and confirmation that all MEL procedures were complied with. In addition; MEL 36-23 (Manf Fail Det Loop) Should state plainly that this MEL only applies when MEL 28-08 is also applied.

Data retrieved from NASA's ASRS site 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.