A B767-300 flight crew received an engine prv warning on takeoff roll. Captain retarded the throttle...

Narrative:

On takeoff roll; after power set and at approximately 60-70 KTS; prv message illuminated. Throttles were retarded. Prv message no longer annunciated. As I reached forward to deploy reversers; throttles advanced automatically. I should have made sure autothrottles were disconnected. The prv message was annunciated for approximately 1 second; and the throttles were retarded and advanced in approximately 1 second. Now above 80 KTS; our procedures specifically state conditions for aborting; none of which existed. Takeoff and flight to cdg were continued uneventfully. Supplemental information from acn 704291: during takeoff from runway 35L the captain advanced the throttles and called for arm autothrottles; engage N1. Shortly after maximum takeoff power was reached; at approximately 60-70 KTS; we received a master caution; beeper; and 'engine prv EICAS' messages. The captain closed the throttles to discontinue the takeoff. As he moved to deploy the thrust reversers the message went away and the autothrottles; which were still engaged and they had not gone into throttle hold yet; advanced the throttles back to maximum takeoff power. The throttles were back only briefly. At this point we were over 80 KTS; with no abnormal situation indicated; and the takeoff was continued. Supplemental information from acn 704293: on takeoff roll with power set; speed 60-70 KTS; the engine prv EICAS message appeared. The captain; who was flying; retarded the throttles and the message immediately went away. As the captain moved his hand to use the thrust reversers; the autothrottles advanced the power to takeoff power. By the time I realized he was continuing the takeoff; we were over 100 KTS. I did not call for an abort. I felt any action as fb at that point would confuse the situation; so I didn't. All system were normal. The elapsed time of the power reduction was about 1 second. We made an uneventful landing at cdg.

Original NASA ASRS Text

Title: A B767-300 FLT CREW RECEIVED AN ENG PRV WARNING ON TKOF ROLL. CAPT RETARDED THE THROTTLES TO ABORT; BUT DID NOT DISCONNECT THE AUTOTHROTTLE; AND WHEN THE PRV LIGHT WENT OUT AND THE AUTOTHROTTLE RETURNED THE THRUST LEVERS TO TKOF PWR; THEY CONTINUED THE TKOF.

Narrative: ON TKOF ROLL; AFTER PWR SET AND AT APPROX 60-70 KTS; PRV MESSAGE ILLUMINATED. THROTTLES WERE RETARDED. PRV MESSAGE NO LONGER ANNUNCIATED. AS I REACHED FORWARD TO DEPLOY REVERSERS; THROTTLES ADVANCED AUTOMATICALLY. I SHOULD HAVE MADE SURE AUTOTHROTTLES WERE DISCONNECTED. THE PRV MESSAGE WAS ANNUNCIATED FOR APPROX 1 SECOND; AND THE THROTTLES WERE RETARDED AND ADVANCED IN APPROX 1 SECOND. NOW ABOVE 80 KTS; OUR PROCS SPECIFICALLY STATE CONDITIONS FOR ABORTING; NONE OF WHICH EXISTED. TKOF AND FLT TO CDG WERE CONTINUED UNEVENTFULLY. SUPPLEMENTAL INFO FROM ACN 704291: DURING TKOF FROM RWY 35L THE CAPT ADVANCED THE THROTTLES AND CALLED FOR ARM AUTOTHROTTLES; ENGAGE N1. SHORTLY AFTER MAX TKOF PWR WAS REACHED; AT APPROX 60-70 KTS; WE RECEIVED A MASTER CAUTION; BEEPER; AND 'ENG PRV EICAS' MESSAGES. THE CAPT CLOSED THE THROTTLES TO DISCONTINUE THE TKOF. AS HE MOVED TO DEPLOY THE THRUST REVERSERS THE MESSAGE WENT AWAY AND THE AUTOTHROTTLES; WHICH WERE STILL ENGAGED AND THEY HAD NOT GONE INTO THROTTLE HOLD YET; ADVANCED THE THROTTLES BACK TO MAX TKOF PWR. THE THROTTLES WERE BACK ONLY BRIEFLY. AT THIS POINT WE WERE OVER 80 KTS; WITH NO ABNORMAL SITUATION INDICATED; AND THE TKOF WAS CONTINUED. SUPPLEMENTAL INFO FROM ACN 704293: ON TKOF ROLL WITH PWR SET; SPD 60-70 KTS; THE ENG PRV EICAS MESSAGE APPEARED. THE CAPT; WHO WAS FLYING; RETARDED THE THROTTLES AND THE MESSAGE IMMEDIATELY WENT AWAY. AS THE CAPT MOVED HIS HAND TO USE THE THRUST REVERSERS; THE AUTOTHROTTLES ADVANCED THE PWR TO TKOF PWR. BY THE TIME I REALIZED HE WAS CONTINUING THE TKOF; WE WERE OVER 100 KTS. I DID NOT CALL FOR AN ABORT. I FELT ANY ACTION AS FB AT THAT POINT WOULD CONFUSE THE SITUATION; SO I DIDN'T. ALL SYS WERE NORMAL. THE ELAPSED TIME OF THE PWR REDUCTION WAS ABOUT 1 SECOND. WE MADE AN UNEVENTFUL LNDG AT CDG.

Data retrieved from NASA's ASRS site as of January 2009 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.

Attributes
ACN	704569
Time
Date	200607
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzzz.tower
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
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	704569
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	704291
Events
Anomaly	aircraft equipment problem : less severe non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

A B767-300 flight crew received an engine prv warning on takeoff roll. Captain retarded the throttles to abort; but did not disconnect the autothrottle; and when the prv light went out and the autothrottle returned the thrust levers to takeoff power; they continued the takeoff.