Narrative:

Aircraft was in position and hold on runway with all checklists completed. When advancing thrust levers for takeoff the takeoff warning horn sounded. Takeoff aborted and returned to ramp. Maintenance troubleshooting revealed that with slats extended the light indications for intransit and extend did not illuminate. Problem solved by cycling circuit breakers, although circuit breakers were not popped at time of incident. At any time after checking the light illuminated on taxi checklist to advancing thrust levers for takeoff the circuitry could have failed and the light extinguished. The slats at all times worked normally. The fact that it was raining and the aircraft was catered in the rain may be a causal factor to this mechanical failure. Substantial amount of water pools in the forward galley when the forward service door is open for catering and it is raining. The water finds its way to the electrical equipment compartment and many times electrical malfunctions have occurred in these circumstances. It would be a good idea to have a canvas awning attached to the catering trucks to extend to the aircraft door sill to block some of the rain from coming in the aircraft.

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Original NASA ASRS Text

Title: MLG ACFT ABORTED TKOF DUE TO FLAP/SLAT SENSING FAULT. RPTR ATTRIBUTES RAIN FROM GALLEY SERVICING TO POSSIBLE CAUSE OF CIRCUIT PROB.

Narrative: ACFT WAS IN POS AND HOLD ON RWY WITH ALL CHKLISTS COMPLETED. WHEN ADVANCING THRUST LEVERS FOR TKOF THE TKOF WARNING HORN SOUNDED. TKOF ABORTED AND RETURNED TO RAMP. MAINT TROUBLESHOOTING REVEALED THAT WITH SLATS EXTENDED THE LIGHT INDICATIONS FOR INTRANSIT AND EXTEND DID NOT ILLUMINATE. PROB SOLVED BY CYCLING CIRCUIT BREAKERS, ALTHOUGH CIRCUIT BREAKERS WERE NOT POPPED AT TIME OF INCIDENT. AT ANY TIME AFTER CHKING THE LIGHT ILLUMINATED ON TAXI CHKLIST TO ADVANCING THRUST LEVERS FOR TKOF THE CIRCUITRY COULD HAVE FAILED AND THE LIGHT EXTINGUISHED. THE SLATS AT ALL TIMES WORKED NORMALLY. THE FACT THAT IT WAS RAINING AND THE ACFT WAS CATERED IN THE RAIN MAY BE A CAUSAL FACTOR TO THIS MECHANICAL FAILURE. SUBSTANTIAL AMOUNT OF WATER POOLS IN THE FORWARD GALLEY WHEN THE FORWARD SVC DOOR IS OPEN FOR CATERING AND IT IS RAINING. THE WATER FINDS ITS WAY TO THE ELECTRICAL EQUIP COMPARTMENT AND MANY TIMES ELECTRICAL MALFUNCTIONS HAVE OCCURRED IN THESE CIRCUMSTANCES. IT WOULD BE A GOOD IDEA TO HAVE A CANVAS AWNING ATTACHED TO THE CATERING TRUCKS TO EXTEND TO THE ACFT DOOR SILL TO BLOCK SOME OF THE RAIN FROM COMING IN THE ACFT.

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.