B757 crew was required to shut down #1 engine after experiencing compressor stalls.

Attributes
ACN	429243
Time
Date	199902
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Navigation In Use	Other
Flight Phase	descent other other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 60 flight time total : 9000 flight time type : 3600
ASRS Report	429243
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other

Narrative:

Heard 2 bangs from left engine, followed by spool down to sub- idle RPM and steadily rising egt. Decided to shut down engine due steadily rising temperature. Accomplished appropriate checklist and shut down left engine. Continued to phl. Landed safely. According to maintenance, compressor stalls were caused by defective electronic bleed valve air controllers. I would like to see mechanical system which are controled by electronic controllers be designed such that a failure of the controller would result in the system returning to a 'fail safe' mode, allowing at least some level of continued operation. Callback conversation with reporter revealed the following information: reporter was flying a B757 aircraft equipped with rolls royce RB211-535 engines. Maintenance told the pilot that the 'electronic bleed valve schedule controller' had failed. This caused the compressor stalls. The engine went to a sub idle condition as noted by the generator dropping off-line and rising egt. The pilot does not know of any other engine failures in the 5 yrs on the aircraft or 9 yrs at his air carrier.

Original NASA ASRS Text

Title: B757 CREW WAS REQUIRED TO SHUT DOWN #1 ENG AFTER EXPERIENCING COMPRESSOR STALLS.

Narrative: HEARD 2 BANGS FROM L ENG, FOLLOWED BY SPOOL DOWN TO SUB- IDLE RPM AND STEADILY RISING EGT. DECIDED TO SHUT DOWN ENG DUE STEADILY RISING TEMP. ACCOMPLISHED APPROPRIATE CHKLIST AND SHUT DOWN L ENG. CONTINUED TO PHL. LANDED SAFELY. ACCORDING TO MAINT, COMPRESSOR STALLS WERE CAUSED BY DEFECTIVE ELECTRONIC BLEED VALVE AIR CONTROLLERS. I WOULD LIKE TO SEE MECHANICAL SYS WHICH ARE CTLED BY ELECTRONIC CONTROLLERS BE DESIGNED SUCH THAT A FAILURE OF THE CONTROLLER WOULD RESULT IN THE SYS RETURNING TO A 'FAIL SAFE' MODE, ALLOWING AT LEAST SOME LEVEL OF CONTINUED OP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS FLYING A B757 ACFT EQUIPPED WITH ROLLS ROYCE RB211-535 ENGS. MAINT TOLD THE PLT THAT THE 'ELECTRONIC BLEED VALVE SCHEDULE CONTROLLER' HAD FAILED. THIS CAUSED THE COMPRESSOR STALLS. THE ENG WENT TO A SUB IDLE CONDITION AS NOTED BY THE GENERATOR DROPPING OFF-LINE AND RISING EGT. THE PLT DOES NOT KNOW OF ANY OTHER ENG FAILURES IN THE 5 YRS ON THE ACFT OR 9 YRS AT HIS ACR.

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.