Takeoff abort due to thrust reverse unlocked indication. Re- dispatched antiskid light activates.

Attributes
ACN	283079
Time
Date	199409
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bos tower : dpa
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 : initial climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 5400 flight time type : 3300
ASRS Report	283079
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : rejected takeoff other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

First incident on initial takeoff roll, highspd abort (125 KIAS) due to indication of right engine thrust reverse unlocked. Returned to gate, called for fire department due to possible hot brakes. Observed limits in brake cooling charts of 85 mins cooling. Maintenance action was to lock out right reverse. Also had intermittent antiskid light (possible heating of probes) cleared by maintenance. Re-dispatched to pbi. Upon second takeoff attempt taking runway 4R got another antiskid light. I selected full takeoff power, antiskid light out prior to takeoff all appears normal. Takeoff uneventful until about 400 ft AGL. When right engine indication of reverse unlocked followed by several caution indications on EICAS and gear down indications for just seconds. Gear was up and locked, reverse was locked out, so appears to be a quirk in warning system. By 1000 ft AGL, all appears back to normal. We called company maintenance and confirmed status of aircraft. It was considered to be a fault in GPWS computer part on aircraft, but back to normal. We continued to pbi with no further problems. Maintenance met aircraft with fix in hand. Throughout these incidents, there was never any aircraft handling problems (no yaws, or airflow disturbance). Control of aircraft was normal and normal cautions and advisories by EICAS continued to be satisfactory. Crews judgement was flight to pbi was safe!

Original NASA ASRS Text

Title: TKOF ABORT DUE TO THRUST REVERSE UNLOCKED INDICATION. RE- DISPATCHED ANTISKID LIGHT ACTIVATES.

Narrative: FIRST INCIDENT ON INITIAL TKOF ROLL, HIGHSPD ABORT (125 KIAS) DUE TO INDICATION OF R ENG THRUST REVERSE UNLOCKED. RETURNED TO GATE, CALLED FOR FIRE DEPT DUE TO POSSIBLE HOT BRAKES. OBSERVED LIMITS IN BRAKE COOLING CHARTS OF 85 MINS COOLING. MAINT ACTION WAS TO LOCK OUT R REVERSE. ALSO HAD INTERMITTENT ANTISKID LIGHT (POSSIBLE HEATING OF PROBES) CLRED BY MAINT. RE-DISPATCHED TO PBI. UPON SECOND TKOF ATTEMPT TAKING RWY 4R GOT ANOTHER ANTISKID LIGHT. I SELECTED FULL TKOF PWR, ANTISKID LIGHT OUT PRIOR TO TKOF ALL APPEARS NORMAL. TKOF UNEVENTFUL UNTIL ABOUT 400 FT AGL. WHEN R ENG INDICATION OF REVERSE UNLOCKED FOLLOWED BY SEVERAL CAUTION INDICATIONS ON EICAS AND GEAR DOWN INDICATIONS FOR JUST SECONDS. GEAR WAS UP AND LOCKED, REVERSE WAS LOCKED OUT, SO APPEARS TO BE A QUIRK IN WARNING SYS. BY 1000 FT AGL, ALL APPEARS BACK TO NORMAL. WE CALLED COMPANY MAINT AND CONFIRMED STATUS OF ACFT. IT WAS CONSIDERED TO BE A FAULT IN GPWS COMPUTER PART ON ACFT, BUT BACK TO NORMAL. WE CONTINUED TO PBI WITH NO FURTHER PROBS. MAINT MET ACFT WITH FIX IN HAND. THROUGHOUT THESE INCIDENTS, THERE WAS NEVER ANY ACFT HANDLING PROBS (NO YAWS, OR AIRFLOW DISTURBANCE). CTL OF ACFT WAS NORMAL AND NORMAL CAUTIONS AND ADVISORIES BY EICAS CONTINUED TO BE SATISFACTORY. CREWS JUDGEMENT WAS FLT TO PBI WAS SAFE!

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.