A B737-300 in climb from 2000 ft to FL210 had #1 engine surging at 3-4% inducing yaw. Engine throttled back and returned to phx. Engine changed at phx.

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Attributes
ACN	495109
Time
Date	200012
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	msl bound lower : 2000 msl bound upper : 21000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : p50.tracon
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 18000 flight time type : 9000
ASRS Report	495109
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb other other : person 3
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Departed phx area. Approximately 3 mins after takeoff, felt aircraft yaw. Checked engines and yaw damper indication. Everything normal when first checked. Approximately 5 mins later, felt another yaw -- this time more pronounced. #1 engine N1 was surging 1-2%. I asked first officer and company jump seater if they had felt the yaw. Both said yes. Engine settled down and continued climb to FL210. Engine started surging again 3-4% N1. Autothrottles disconnected and thrust reduced. Advised center we needed to return to phx. With autothrottle off, engine continued to surge. QRH consulted for engine surge. I asked first officer to call maintenance and dispatch for return. Jump seater was asked to confer with flight attendants and make cabin announcement. Started return to phx and amber caution light for power management control (engine #1) came on, QRH was consulted for this also. All 3 crew members very busy with QRH, normal checklist and radios. Engine surge settled down with low engine readings. Jump seater was asked to monitor engine for N1 surges on landing. Normal landing. Note: #1 engine was changed on dec/xa/00.

Original NASA ASRS Text

Title: A B737-300 IN CLB FROM 2000 FT TO FL210 HAD #1 ENG SURGING AT 3-4% INDUCING YAW. ENG THROTTLED BACK AND RETURNED TO PHX. ENG CHANGED AT PHX.

Narrative: DEPARTED PHX AREA. APPROX 3 MINS AFTER TKOF, FELT ACFT YAW. CHKED ENGS AND YAW DAMPER INDICATION. EVERYTHING NORMAL WHEN FIRST CHKED. APPROX 5 MINS LATER, FELT ANOTHER YAW -- THIS TIME MORE PRONOUNCED. #1 ENG N1 WAS SURGING 1-2%. I ASKED FO AND COMPANY JUMP SEATER IF THEY HAD FELT THE YAW. BOTH SAID YES. ENG SETTLED DOWN AND CONTINUED CLB TO FL210. ENG STARTED SURGING AGAIN 3-4% N1. AUTOTHROTTLES DISCONNECTED AND THRUST REDUCED. ADVISED CTR WE NEEDED TO RETURN TO PHX. WITH AUTOTHROTTLE OFF, ENG CONTINUED TO SURGE. QRH CONSULTED FOR ENG SURGE. I ASKED FO TO CALL MAINT AND DISPATCH FOR RETURN. JUMP SEATER WAS ASKED TO CONFER WITH FLT ATTENDANTS AND MAKE CABIN ANNOUNCEMENT. STARTED RETURN TO PHX AND AMBER CAUTION LIGHT FOR PWR MGMNT CTL (ENG #1) CAME ON, QRH WAS CONSULTED FOR THIS ALSO. ALL 3 CREW MEMBERS VERY BUSY WITH QRH, NORMAL CHKLIST AND RADIOS. ENG SURGE SETTLED DOWN WITH LOW ENG READINGS. JUMP SEATER WAS ASKED TO MONITOR ENG FOR N1 SURGES ON LNDG. NORMAL LNDG. NOTE: #1 ENG WAS CHANGED ON DEC/XA/00.

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.