<< >> NASA ASRS Report 357502, January 1997

An air carrier flight crew has the left engine roll back toward idle with the EPR reading zero. After a short time the engine returned to normal operation and remained so for the remainder of the flight. B757-200. Pratt & whitney 2037 engine.

Attributes
ACN	357502
Time
Date	199701
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bff
State Reference	NE
Altitude	msl bound lower : 41000 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 23000 flight time type : 150
ASRS Report	357502
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	aircraft : equipment problem dissipated
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At FL410 cruise, B757 left engine suddenly lost power, EPR to '0' egt and N1 rolled back. Engine recovered itself in 7-10 seconds and operated normally remainder of flight. Ignition was turned on (but do not know if it helped in recovery or not). Rest of flight was routine. (Maintenance found tenth stage bleed malfunction.) callback conversation with reporter revealed the following information: the reporter said that he had never heard of an engine rollback in a B757-200 before this. However, during his radio and postflt conversations with maintenance representatives, he said that they mentioned the tenth stage bleed as a source of the problem. Later he was told that they had changed the tenth stage bleed control system on this P&west 2037 engine and it performed normally.

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Original NASA ASRS Text

Title: AN ACR FLC HAS THE L ENG ROLL BACK TOWARD IDLE WITH THE EPR READING ZERO. AFTER A SHORT TIME THE ENG RETURNED TO NORMAL OP AND REMAINED SO FOR THE REMAINDER OF THE FLT. B757-200. PRATT & WHITNEY 2037 ENG.

Narrative: AT FL410 CRUISE, B757 L ENG SUDDENLY LOST PWR, EPR TO '0' EGT AND N1 ROLLED BACK. ENG RECOVERED ITSELF IN 7-10 SECONDS AND OPERATED NORMALLY REMAINDER OF FLT. IGNITION WAS TURNED ON (BUT DO NOT KNOW IF IT HELPED IN RECOVERY OR NOT). REST OF FLT WAS ROUTINE. (MAINT FOUND TENTH STAGE BLEED MALFUNCTION.) CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT HE HAD NEVER HEARD OF AN ENG ROLLBACK IN A B757-200 BEFORE THIS. HOWEVER, DURING HIS RADIO AND POSTFLT CONVERSATIONS WITH MAINT REPRESENTATIVES, HE SAID THAT THEY MENTIONED THE TENTH STAGE BLEED AS A SOURCE OF THE PROB. LATER HE WAS TOLD THAT THEY HAD CHANGED THE TENTH STAGE BLEED CTL SYS ON THIS P&W 2037 ENG AND IT PERFORMED NORMALLY.

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.