<< >> NASA ASRS Report 621141, May 2004

An MD83 rejected takeoff near 90 KTS due to autothrottle disconnect. Engine operations normal. Second attempt normal until just before rotation, autothrottle disconnected. Takeoff continued.

Attributes
ACN	621141
Time
Date	200405
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dca.airport
State Reference	DC
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	621141
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : epr indications other flight crewa other flight crewb
Resolutory Action	flight crew : rejected takeoff
Consequence	other other
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff at dca, the autothrottle disconnected. At or near 90 KTS or so, the EPR chevrons rolled back, followed by the right EPR rolling back .05. Anticipating engine failure, and at or about 90 KTS into a 10 KT headwind on a dry 6800 ft runway with a light aircraft, I rejected the takeoff, clearing the runway with around 1900-2000 ft left. Engine operations were normal and returned for takeoff. On second takeoff, engine indications normal until just before rotation, autothrottles again disconnected. Continued takeoff as normal. Maintenance at destination could find nothing wrong with aircraft and left. 10 mins later, with abnormal indications on tri, maintenance returned to replace the #2 CADC.

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Original NASA ASRS Text

Title: AN MD83 REJECTED TKOF NEAR 90 KTS DUE TO AUTOTHROTTLE DISCONNECT. ENG OPS NORMAL. SECOND ATTEMPT NORMAL UNTIL JUST BEFORE ROTATION, AUTOTHROTTLE DISCONNECTED. TKOF CONTINUED.

Narrative: ON TKOF AT DCA, THE AUTOTHROTTLE DISCONNECTED. AT OR NEAR 90 KTS OR SO, THE EPR CHEVRONS ROLLED BACK, FOLLOWED BY THE R EPR ROLLING BACK .05. ANTICIPATING ENG FAILURE, AND AT OR ABOUT 90 KTS INTO A 10 KT HEADWIND ON A DRY 6800 FT RWY WITH A LIGHT ACFT, I REJECTED THE TKOF, CLRING THE RWY WITH AROUND 1900-2000 FT LEFT. ENG OPS WERE NORMAL AND RETURNED FOR TKOF. ON SECOND TKOF, ENG INDICATIONS NORMAL UNTIL JUST BEFORE ROTATION, AUTOTHROTTLES AGAIN DISCONNECTED. CONTINUED TKOF AS NORMAL. MAINT AT DEST COULD FIND NOTHING WRONG WITH ACFT AND LEFT. 10 MINS LATER, WITH ABNORMAL INDICATIONS ON TRI, MAINT RETURNED TO REPLACE THE #2 CADC.

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.