Takeoff aborted account takeoff warning horn. Flap position indicator leading edge circuit breaker had popped. Flight crew theorizes first officer seat belt shoulder harness had recoiled when released hitting the circuit breaker and causing it to pop out.

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Attributes
ACN	191981
Time
Date	199110
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ewr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 27000 flight time type : 210
ASRS Report	191981
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 1000
ASRS Report	191982
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

We had been cleared onto the runway for takeoff, after throttles had moved towards takeoff power the takeoff warning horn sounded and we checked the normal items that give the alert. Not finding anything wrong, I pulled off the power and called for the abort. After clearing the runway and not needing any assistance we checked for problems. Found flap position indicator leading edge circuit breaker out. First officer had just before taxiing onto runway dropped an item on the floor and in reaching for it released his shoulder harness, which has a high recoil and hit the circuit breaker panel behind him and pulled out the circuit breaker (above). Speed of aircraft was about a fast taxi at abort. (Fix). The advanced medium large transport seat belt shoulder harness recoil tension should be reduced to prevent this common problem.

Original NASA ASRS Text

Title: TKOF ABORTED ACCOUNT TKOF WARNING HORN. FLAP POS INDICATOR LEADING EDGE CIRCUIT BREAKER HAD POPPED. FLC THEORIZES FO SEAT BELT SHOULDER HARNESS HAD RECOILED WHEN RELEASED HITTING THE CIRCUIT BREAKER AND CAUSING IT TO POP OUT.

Narrative: WE HAD BEEN CLRED ONTO THE RWY FOR TKOF, AFTER THROTTLES HAD MOVED TOWARDS TKOF PWR THE TKOF WARNING HORN SOUNDED AND WE CHKED THE NORMAL ITEMS THAT GIVE THE ALERT. NOT FINDING ANYTHING WRONG, I PULLED OFF THE PWR AND CALLED FOR THE ABORT. AFTER CLRING THE RWY AND NOT NEEDING ANY ASSISTANCE WE CHKED FOR PROBLEMS. FOUND FLAP POS INDICATOR LEADING EDGE CIRCUIT BREAKER OUT. FO HAD JUST BEFORE TAXIING ONTO RWY DROPPED AN ITEM ON THE FLOOR AND IN REACHING FOR IT RELEASED HIS SHOULDER HARNESS, WHICH HAS A HIGH RECOIL AND HIT THE CIRCUIT BREAKER PANEL BEHIND HIM AND PULLED OUT THE CIRCUIT BREAKER (ABOVE). SPD OF ACFT WAS ABOUT A FAST TAXI AT ABORT. (FIX). THE ADVANCED MLG SEAT BELT SHOULDER HARNESS RECOIL TENSION SHOULD BE REDUCED TO PREVENT THIS COMMON PROBLEM.

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.