<< >> NASA ASRS Report 639437, December 2004

High speed abort over 80 KTS by an SF34 flight crew when their right engine torque fails to meet required takeoff setting at dfw.

Attributes
ACN	639437
Time
Date	200412
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll ground other : abort
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain
Qualification	pilot : atp
ASRS Report	639437
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	639438
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : rt engine torque gauge other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	other Other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After calling set power, we accelerated rather rapidly with such a light takeoff weight. At 80 KTS the callout 'power set,' and 'your aircraft' was almost simultaneous. It was at that point I noted the right engine torque gauge indicating only 80% and called for an abort. By that time the aircraft had already accelerated to approximately 90 KTS. Since the runway was 10000 ft long and dry, we did not use heavy braking, but rather used reverse and allowed the aircraft to decelerate. Our V1 speed for our weight was 113 KTS. So we were well under that. We taxied back to the gate with no further incident. Supplemental information from acn 639438: called power set 80 KTS being hesitant on the set power, but all other indications were normal. Captain took controls as PF. We aborted above 80 KTS and according to AOM1 it was a high speed abort.

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Original NASA ASRS Text

Title: HIGH SPD ABORT OVER 80 KTS BY AN SF34 FLT CREW WHEN THEIR R ENG TORQUE FAILS TO MEET REQUIRED TKOF SETTING AT DFW.

Narrative: AFTER CALLING SET PWR, WE ACCELERATED RATHER RAPIDLY WITH SUCH A LIGHT TKOF WT. AT 80 KTS THE CALLOUT 'PWR SET,' AND 'YOUR ACFT' WAS ALMOST SIMULTANEOUS. IT WAS AT THAT POINT I NOTED THE R ENG TORQUE GAUGE INDICATING ONLY 80% AND CALLED FOR AN ABORT. BY THAT TIME THE ACFT HAD ALREADY ACCELERATED TO APPROX 90 KTS. SINCE THE RWY WAS 10000 FT LONG AND DRY, WE DID NOT USE HVY BRAKING, BUT RATHER USED REVERSE AND ALLOWED THE ACFT TO DECELERATE. OUR V1 SPD FOR OUR WT WAS 113 KTS. SO WE WERE WELL UNDER THAT. WE TAXIED BACK TO THE GATE WITH NO FURTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 639438: CALLED PWR SET 80 KTS BEING HESITANT ON THE SET PWR, BUT ALL OTHER INDICATIONS WERE NORMAL. CAPT TOOK CTLS AS PF. WE ABORTED ABOVE 80 KTS AND ACCORDING TO AOM1 IT WAS A HIGH SPD ABORT.

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.