A B737-300 rejected takeoff due to takeoff warning horn sounded. Found flap indicator circuit breake...

Attributes
ACN	592673
Time
Date	200309
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 180 flight time total : 4500 flight time type : 450
ASRS Report	592673
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : tkof warning horn other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Supplementary
Problem Areas	Aircraft Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Tower cleared the flight into position on runway 11L. Captain called 'below the line.' he pushed up the thrust lever to check takeoff warning horn. When we reached step #2, the cockpit door was not locked. He asked me to move the switch on the door to the locked position. I removed my shoulder harness to reach back and secure the lock. We continued the 'below the line' checklist. Moments after we were cleared for takeoff and upon advancing the thrust levers we got the takeoff warning horn. The rejected takeoff was accomplished with all appropriate procedures. Upon exiting the runway, we discovered that the 'leading edge flap indicator' circuit breaker was tripped. Noting its location, and me not guarding my shoulder harness when I released it to lock the door, I am certain that my shoulder harness tripped the circuit breaker. What I should have done: 1) checked the cockpit door lock before pushback from the gate. 2) knowing that the shoulder harnesses can trip circuit breakers, I should have guarded the belts better when I released them. 3) most of all, we should have started the 'below the line' checklist from the beginning once we corrected the unlocked door. This would have prompted us to advance the thrust lever and catch the problem.

Original NASA ASRS Text

Title: A B737-300 REJECTED TKOF DUE TO TKOF WARNING HORN SOUNDED. FOUND FLAP INDICATOR CIRCUIT BREAKER TRIPPED. BREAKER TRIPPED BY FO'S SHOULDER HARNESS.

Narrative: TWR CLRED THE FLT INTO POS ON RWY 11L. CAPT CALLED 'BELOW THE LINE.' HE PUSHED UP THE THRUST LEVER TO CHK TKOF WARNING HORN. WHEN WE REACHED STEP #2, THE COCKPIT DOOR WAS NOT LOCKED. HE ASKED ME TO MOVE THE SWITCH ON THE DOOR TO THE LOCKED POS. I REMOVED MY SHOULDER HARNESS TO REACH BACK AND SECURE THE LOCK. WE CONTINUED THE 'BELOW THE LINE' CHKLIST. MOMENTS AFTER WE WERE CLRED FOR TKOF AND UPON ADVANCING THE THRUST LEVERS WE GOT THE TKOF WARNING HORN. THE REJECTED TKOF WAS ACCOMPLISHED WITH ALL APPROPRIATE PROCS. UPON EXITING THE RWY, WE DISCOVERED THAT THE 'LEADING EDGE FLAP INDICATOR' CIRCUIT BREAKER WAS TRIPPED. NOTING ITS LOCATION, AND ME NOT GUARDING MY SHOULDER HARNESS WHEN I RELEASED IT TO LOCK THE DOOR, I AM CERTAIN THAT MY SHOULDER HARNESS TRIPPED THE CIRCUIT BREAKER. WHAT I SHOULD HAVE DONE: 1) CHKED THE COCKPIT DOOR LOCK BEFORE PUSHBACK FROM THE GATE. 2) KNOWING THAT THE SHOULDER HARNESSES CAN TRIP CIRCUIT BREAKERS, I SHOULD HAVE GUARDED THE BELTS BETTER WHEN I RELEASED THEM. 3) MOST OF ALL, WE SHOULD HAVE STARTED THE 'BELOW THE LINE' CHKLIST FROM THE BEGINNING ONCE WE CORRECTED THE UNLOCKED DOOR. THIS WOULD HAVE PROMPTED US TO ADVANCE THE THRUST LEVER AND CATCH THE PROB.

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.

A B737-300 rejected takeoff due to takeoff warning horn sounded. Found flap indicator circuit breaker tripped. Breaker tripped by first officer's shoulder harness.