<< >> NASA ASRS Report 435049, April 1999

Flight crew of a gulfstream G2 diverted to another airport en route due to losing pressurization control when the main inverter failed.

Attributes
ACN	435049
Time
Date	199904
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : fmn.airport
State Reference	NM
Altitude	msl single value : 41000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream II
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Route In Use	enroute : on vectors enroute : direct
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine pilot : atp
Experience	flight time last 90 days : 45 flight time total : 6200 flight time type : 400
ASRS Report	735049
Person 2
Affiliation	other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : flt. instruments & press. other flight crewa other flight crewb
Resolutory Action	flight crew : landed as precaution flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

While cruising at FL410 direct fsm for las, we encountered a main inverter failure which caused our autoplt and all instruments to fail along with pitch trim, mach trim, and yaw damper. The pressurization is also controled by the main inverter. This caused us to request immediate descent before losing pressurization. Although we were able to resolve instrument problem by troubleshooting and selecting standby inverter, the pressurization continued to waiver erratically, causing us to continue descent and land at fmn. Visual separation was monitor with possible targets along with an operable TCASII. Possible delay in time to react to pressurization reverting to manual may have allowed us to not have a need to descend so rapidly.

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Original NASA ASRS Text

Title: FLC OF A GULFSTREAM G2 DIVERTED TO ANOTHER ARPT ENRTE DUE TO LOSING PRESSURIZATION CTL WHEN THE MAIN INVERTER FAILED.

Narrative: WHILE CRUISING AT FL410 DIRECT FSM FOR LAS, WE ENCOUNTERED A MAIN INVERTER FAILURE WHICH CAUSED OUR AUTOPLT AND ALL INSTS TO FAIL ALONG WITH PITCH TRIM, MACH TRIM, AND YAW DAMPER. THE PRESSURIZATION IS ALSO CTLED BY THE MAIN INVERTER. THIS CAUSED US TO REQUEST IMMEDIATE DSCNT BEFORE LOSING PRESSURIZATION. ALTHOUGH WE WERE ABLE TO RESOLVE INST PROB BY TROUBLESHOOTING AND SELECTING STANDBY INVERTER, THE PRESSURIZATION CONTINUED TO WAIVER ERRATICALLY, CAUSING US TO CONTINUE DSCNT AND LAND AT FMN. VISUAL SEPARATION WAS MONITOR WITH POSSIBLE TARGETS ALONG WITH AN OPERABLE TCASII. POSSIBLE DELAY IN TIME TO REACT TO PRESSURIZATION REVERTING TO MANUAL MAY HAVE ALLOWED US TO NOT HAVE A NEED TO DSND SO RAPIDLY.

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.