<< >> NASA ASRS Report 412916, September 1998

C560 aircraft equipped with P&west 535A engines on company flight test activity to verify the engine relight envelope. The #2 engine would not relight.

Attributes
ACN	412916
Time
Date	199809
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ict
State Reference	KS
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	cruise other descent other other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 6000 flight time type : 250
ASRS Report	412916
Person 2
Affiliation	Other
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Performing required experimental flight test for far part 25 certification. Test performed was to determine relight envelope for the engines. Right engine failed to relight at FL350. Unable to maintain altitude on single engine. Advised ATC and was cleared to lower altitude. No deviations from ATC clrncs occurred. Callback conversation with reporter revealed the following information: the aircraft was undergoing a far part 25 certification flight test. The test was to verify the engine relight envelope. The engines installed were pratt and whitney 535A. The #1 engine was successfully shut down and relit. #2 engine would not relight. Descent was initiated while simultaneously informing ARTCC. After a lower altitude was reached a successful relight was accomplished. Upon returning to base, the aircraft manufacturer and power plant manufacturer determined that the engine 'bleed off valve' had malfunctioned.

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Original NASA ASRS Text

Title: C560 ACFT EQUIPPED WITH P&W 535A ENGS ON COMPANY FLT TEST ACTIVITY TO VERIFY THE ENG RELIGHT ENVELOPE. THE #2 ENG WOULD NOT RELIGHT.

Narrative: PERFORMING REQUIRED EXPERIMENTAL FLT TEST FOR FAR PART 25 CERTIFICATION. TEST PERFORMED WAS TO DETERMINE RELIGHT ENVELOPE FOR THE ENGS. R ENG FAILED TO RELIGHT AT FL350. UNABLE TO MAINTAIN ALT ON SINGLE ENG. ADVISED ATC AND WAS CLRED TO LOWER ALT. NO DEVS FROM ATC CLRNCS OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACFT WAS UNDERGOING A FAR PART 25 CERTIFICATION FLT TEST. THE TEST WAS TO VERIFY THE ENG RELIGHT ENVELOPE. THE ENGS INSTALLED WERE PRATT AND WHITNEY 535A. THE #1 ENG WAS SUCCESSFULLY SHUT DOWN AND RELIT. #2 ENG WOULD NOT RELIGHT. DSCNT WAS INITIATED WHILE SIMULTANEOUSLY INFORMING ARTCC. AFTER A LOWER ALT WAS REACHED A SUCCESSFUL RELIGHT WAS ACCOMPLISHED. UPON RETURNING TO BASE, THE ACFT MANUFACTURER AND PWR PLANT MANUFACTURER DETERMINED THAT THE ENG 'BLEED OFF VALVE' HAD MALFUNCTIONED.

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.