A B737-700 at climb out at 10000 ft when first officer advanced throttles a loud bang heard and left yaw experienced. Crew decided to divert.

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Attributes
ACN	593143
Time
Date	200309
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 16000 flight time type : 14
ASRS Report	593143
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 10800 flight time type : 5800
ASRS Report	593144
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : left n1 indicator other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

On climb out from ZZZ we were nearing 10000 ft when we noticed FMC climb limit was at climb 2 and we selected the N1 page and selected climb 1. First officer slowly advanced throttles and a few seconds later we heard a loud bang and a yaw left. The engine never exceeded its limits. We got a call from a deadheading pilot in the back who said he saw a flame exit the #1 engine. He thought it was a bird. The engines were still running normally. We then made a PA to the passenger telling them that the engines were normal. After talking it over with the first officer and the deadheading pilot, I decided to land at ZZZ1 as a precautionary to have maintenance have a look. We weren't sure if it was the engine or a bird. We landed without incident and changed aircraft and continued to ZZZ2. Callback conversation with reporter revealed the following information: the reporter stated maintenance reported the left engine did not ingest a bird but a hydro mechanical fuel unit was replaced. The reporter said no emergency was declared as the engine continued to run normally after the stall.

Original NASA ASRS Text

Title: A B737-700 AT CLBOUT AT 10000 FT WHEN FO ADVANCED THROTTLES A LOUD BANG HEARD AND L YAW EXPERIENCED. CREW DECIDED TO DIVERT.

Narrative: ON CLBOUT FROM ZZZ WE WERE NEARING 10000 FT WHEN WE NOTICED FMC CLB LIMIT WAS AT CLB 2 AND WE SELECTED THE N1 PAGE AND SELECTED CLB 1. FO SLOWLY ADVANCED THROTTLES AND A FEW SECONDS LATER WE HEARD A LOUD BANG AND A YAW L. THE ENG NEVER EXCEEDED ITS LIMITS. WE GOT A CALL FROM A DEADHEADING PLT IN THE BACK WHO SAID HE SAW A FLAME EXIT THE #1 ENG. HE THOUGHT IT WAS A BIRD. THE ENGS WERE STILL RUNNING NORMALLY. WE THEN MADE A PA TO THE PAX TELLING THEM THAT THE ENGS WERE NORMAL. AFTER TALKING IT OVER WITH THE FO AND THE DEADHEADING PLT, I DECIDED TO LAND AT ZZZ1 AS A PRECAUTIONARY TO HAVE MAINT HAVE A LOOK. WE WEREN'T SURE IF IT WAS THE ENG OR A BIRD. WE LANDED WITHOUT INCIDENT AND CHANGED ACFT AND CONTINUED TO ZZZ2. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED MAINT RPTED THE L ENG DID NOT INGEST A BIRD BUT A HYDRO MECHANICAL FUEL UNIT WAS REPLACED. THE RPTR SAID NO EMER WAS DECLARED AS THE ENG CONTINUED TO RUN NORMALLY AFTER THE STALL.

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.