A B767-200 on taxi out with left engine only, left generator inoperative deferred, APU flamed out when starting right engine. Aircraft lost all center electrical power. Had no brakes or nose gear steering.

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Attributes
ACN	444854
Time
Date	199907
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 16000 flight time type : 7000
ASRS Report	444854
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
Independent Detector	aircraft equipment other aircraft equipment : c system hydraulic ind other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : regained aircraft control none taken : unable
Consequence	other
Supplementary
Problem Areas	Maintenance Human Performance Company Chart Or Publication Aircraft Flight Crew Human Performance
Primary Problem	Company

Narrative:

Lost all electrical power while taxiing. Aircraft began uncontrollable turn off taxiway. Able to stop prior to departing taxiway thanks to APU restart and regained electrics. Single engine taxi should be done with operative generator engine (left generator dispatched inoperative). Callback conversation with reporter revealed the following information: the reporter said the left engine was running for a single engine taxi per the company fuel saving procedure. The left engine generator was previously deferred as inoperative and placarded. The reporter stated that the APU was supplying electrical power and pwring the center AC electric hydraulic pumps which supplied hydraulics to the brakes and nose gear steering. The reporter said that on attempting to start the right engine the APU flamed out with the total loss of electrical power. The reporter said the airplane became uncontrollable and control was regained when the APU restart was successful. The reporter stated the single engine taxi is not a safe procedure.

Original NASA ASRS Text

Title: A B767-200 ON TAXI OUT WITH L ENG ONLY, L GENERATOR INOP DEFERRED, APU FLAMED OUT WHEN STARTING R ENG. ACFT LOST ALL CTR ELECTRICAL PWR. HAD NO BRAKES OR NOSE GEAR STEERING.

Narrative: LOST ALL ELECTRICAL PWR WHILE TAXIING. ACFT BEGAN UNCTLABLE TURN OFF TXWY. ABLE TO STOP PRIOR TO DEPARTING TXWY THANKS TO APU RESTART AND REGAINED ELECTRICS. SINGLE ENG TAXI SHOULD BE DONE WITH OPERATIVE GENERATOR ENG (L GENERATOR DISPATCHED INOP). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE L ENG WAS RUNNING FOR A SINGLE ENG TAXI PER THE COMPANY FUEL SAVING PROC. THE L ENG GENERATOR WAS PREVIOUSLY DEFERRED AS INOP AND PLACARDED. THE RPTR STATED THAT THE APU WAS SUPPLYING ELECTRICAL PWR AND PWRING THE CTR AC ELECTRIC HYD PUMPS WHICH SUPPLIED HYDS TO THE BRAKES AND NOSE GEAR STEERING. THE RPTR SAID THAT ON ATTEMPTING TO START THE R ENG THE APU FLAMED OUT WITH THE TOTAL LOSS OF ELECTRICAL PWR. THE RPTR SAID THE AIRPLANE BECAME UNCTLABLE AND CTL WAS REGAINED WHEN THE APU RESTART WAS SUCCESSFUL. THE RPTR STATED THE SINGLE ENG TAXI IS NOT A SAFE PROC.

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.