Flight crew of B757 shut down left engine during climb when all engine indications surged and aircraft yawed in response. Declared emergency and returned to departure airport.

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Attributes
ACN	595900
Time
Date	200310
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sju.airport
State Reference	PR
Altitude	msl single value : 12000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : sju.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	approach : traffic pattern
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	595900
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	595901
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	aircraft equipment other aircraft equipment : epr other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Takeoff -- standard power left engine slow to stabilize. During climb at 12000 ft within 25 DME of sju, heard left engine surge confirmed by EPR 1.4 to 1.7 and N1, egt, N2, 'ff' surging. Aircraft could be felt yawing. Felt like it was getting worse. Captain brought left engine to idle. At captain's command, I declared emergency and flew the aircraft return to sju. We were under VMC conditions. The aircraft was hand flown. Captain was communicating with the flight attendants and passenger. Landing visual landing under maximum landing weight. ATC had called out crash fire rescue equipment. Normal landing and return to the gate. Shut down.

Original NASA ASRS Text

Title: FLT CREW OF B757 SHUT DOWN L ENG DURING CLB WHEN ALL ENG INDICATIONS SURGED AND ACFT YAWED IN RESPONSE. DECLARED EMER AND RETURNED TO DEP ARPT.

Narrative: TKOF -- STANDARD PWR L ENG SLOW TO STABILIZE. DURING CLB AT 12000 FT WITHIN 25 DME OF SJU, HEARD L ENG SURGE CONFIRMED BY EPR 1.4 TO 1.7 AND N1, EGT, N2, 'FF' SURGING. ACFT COULD BE FELT YAWING. FELT LIKE IT WAS GETTING WORSE. CAPT BROUGHT L ENG TO IDLE. AT CAPT'S COMMAND, I DECLARED EMER AND FLEW THE ACFT RETURN TO SJU. WE WERE UNDER VMC CONDITIONS. THE ACFT WAS HAND FLOWN. CAPT WAS COMMUNICATING WITH THE FLT ATTENDANTS AND PAX. LNDG VISUAL LNDG UNDER MAX LNDG WT. ATC HAD CALLED OUT CFR. NORMAL LNDG AND RETURN TO THE GATE. SHUT DOWN.

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.