An air carrier B757 flight crew rejected their takeoff twice due to GPWS warnings during the takeoff...

Attributes
ACN	391339
Time
Date	199801
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	391339
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	391340
Events
Anomaly	aircraft equipment problem : less severe non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : rejected takeoff other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On initial takeoff roll, at about 80 KTS, I aborted due to a GPWS warning of 'terrain, terrain,' 'pull up' and associated lights. Abort went normally with autobrakes activating on the initial abort. At that point, I initiated moderate braking. Brake cooling was not required. I suspected the warning was caused by a negative reading on the standby altimeter, which was set to the current filed altimeter setting. After resetting the standby altimeter to field elevation, a second takeoff attempt was made with the same warning. Abort was initiated in the same manner as before. We returned to the gate for a maintenance inspection. The GPWS system revealed no faults and no record of having given a warning. As per engineering recommendation, the system was placarded inoperative. Subsequent flight was uneventful.

Original NASA ASRS Text

Title: AN ACR B757 FLC REJECTED THEIR TKOF TWICE DUE TO GPWS WARNINGS DURING THE TKOF ROLL.

Narrative: ON INITIAL TKOF ROLL, AT ABOUT 80 KTS, I ABORTED DUE TO A GPWS WARNING OF 'TERRAIN, TERRAIN,' 'PULL UP' AND ASSOCIATED LIGHTS. ABORT WENT NORMALLY WITH AUTOBRAKES ACTIVATING ON THE INITIAL ABORT. AT THAT POINT, I INITIATED MODERATE BRAKING. BRAKE COOLING WAS NOT REQUIRED. I SUSPECTED THE WARNING WAS CAUSED BY A NEGATIVE READING ON THE STANDBY ALTIMETER, WHICH WAS SET TO THE CURRENT FILED ALTIMETER SETTING. AFTER RESETTING THE STANDBY ALTIMETER TO FIELD ELEVATION, A SECOND TKOF ATTEMPT WAS MADE WITH THE SAME WARNING. ABORT WAS INITIATED IN THE SAME MANNER AS BEFORE. WE RETURNED TO THE GATE FOR A MAINT INSPECTION. THE GPWS SYS REVEALED NO FAULTS AND NO RECORD OF HAVING GIVEN A WARNING. AS PER ENGINEERING RECOMMENDATION, THE SYS WAS PLACARDED INOP. SUBSEQUENT FLT WAS UNEVENTFUL.

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.

An air carrier B757 flight crew rejected their takeoff twice due to GPWS warnings during the takeoff roll.