Narrative:

Backgnd information on door warning light system: the medium large transport actually has 2 passenger entry door warning system. The 'standard' medium large transport comes with an amber light which illuminates when the door is unlatched, such as when the plane is parked at the jetway. My company has added an additional system which illuminates a red passenger door light when microswitches in the door aren't contacting properly and either throttle is moved above a certain power setting. That power setting is such that you have to exceed it just to get the airplane moving if it is stopped. On this day, that red warning light did not illuminate as we taxied out of the gate. As we began the takeoff roll, the captain advanced the throttles and, just as I was getting them 'fine tuned,' the red door warning light illuminated. We hadn't even made it to a speed of 60 KTS yet. The captain closed the throttles and exited the runway at the first available exit. I told the tower 'we're rejecting this takeoff.' we pulled off into the run-up block area at the end of the runway and cycled the door one time. Then, when the throttles were advanced, the red warning light did not illuminate, so we determined that the door was indeed safe. Keep in mind that the other door warning (amber) never did illuminate except when we cycled the door -- as it should. This most probably was a microswitch problem. The safety of flight was never in question after we exited the runway to investigate. The red light did not illuminate as we left the gate. The flight was completed without incident.

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Original NASA ASRS Text

Title: ACR MLG TKOF ABORTED WHEN SECONDARY DOOR WARNING LIGHT ILLUMINATED DURING INITIAL PHASE OF TKOF PROC.

Narrative: BACKGND INFO ON DOOR WARNING LIGHT SYS: THE MLG ACTUALLY HAS 2 PAX ENTRY DOOR WARNING SYS. THE 'STANDARD' MLG COMES WITH AN AMBER LIGHT WHICH ILLUMINATES WHEN THE DOOR IS UNLATCHED, SUCH AS WHEN THE PLANE IS PARKED AT THE JETWAY. MY COMPANY HAS ADDED AN ADDITIONAL SYS WHICH ILLUMINATES A RED PAX DOOR LIGHT WHEN MICROSWITCHES IN THE DOOR AREN'T CONTACTING PROPERLY AND EITHER THROTTLE IS MOVED ABOVE A CERTAIN PWR SETTING. THAT PWR SETTING IS SUCH THAT YOU HAVE TO EXCEED IT JUST TO GET THE AIRPLANE MOVING IF IT IS STOPPED. ON THIS DAY, THAT RED WARNING LIGHT DID NOT ILLUMINATE AS WE TAXIED OUT OF THE GATE. AS WE BEGAN THE TKOF ROLL, THE CAPT ADVANCED THE THROTTLES AND, JUST AS I WAS GETTING THEM 'FINE TUNED,' THE RED DOOR WARNING LIGHT ILLUMINATED. WE HADN'T EVEN MADE IT TO A SPD OF 60 KTS YET. THE CAPT CLOSED THE THROTTLES AND EXITED THE RWY AT THE FIRST AVAILABLE EXIT. I TOLD THE TWR 'WE'RE REJECTING THIS TKOF.' WE PULLED OFF INTO THE RUN-UP BLOCK AREA AT THE END OF THE RWY AND CYCLED THE DOOR ONE TIME. THEN, WHEN THE THROTTLES WERE ADVANCED, THE RED WARNING LIGHT DID NOT ILLUMINATE, SO WE DETERMINED THAT THE DOOR WAS INDEED SAFE. KEEP IN MIND THAT THE OTHER DOOR WARNING (AMBER) NEVER DID ILLUMINATE EXCEPT WHEN WE CYCLED THE DOOR -- AS IT SHOULD. THIS MOST PROBABLY WAS A MICROSWITCH PROB. THE SAFETY OF FLT WAS NEVER IN QUESTION AFTER WE EXITED THE RWY TO INVESTIGATE. THE RED LIGHT DID NOT ILLUMINATE AS WE LEFT THE GATE. THE FLT WAS COMPLETED WITHOUT INCIDENT.

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.