Narrative:

The APU on this aircraft was deferred and inoperative. This required either aircart or a xbleed start of the left engine with air produced by the right engine. We used an aircart to start the right engine, then taxied the aircraft to the gate to enplane passenger. We then taxied out toward the runway without difficulty. A xbleed start on this aircraft calls for 60 psi of air pressure and this requires the right engine to be spooled up to about 75-80 percent thrust. The taxiway was covered with about 1/8 of an inch of 'black' ice with rain falling on it. I slowed the aircraft to about 1 to 2 mi per hour with brakes and directed the first officer to start the left engine concurrently, bringing the thrust up on the right engine.

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Original NASA ASRS Text

Title: MDT ENCOUNTERS BLACK ICE AND DURING ENG START USING R ENG AIR, ACFT SLID OFF RWY INTO MUD.

Narrative: THE APU ON THIS ACFT WAS DEFERRED AND INOP. THIS REQUIRED EITHER AIRCART OR A XBLEED START OF THE L ENG WITH AIR PRODUCED BY THE R ENG. WE USED AN AIRCART TO START THE R ENG, THEN TAXIED THE ACFT TO THE GATE TO ENPLANE PAX. WE THEN TAXIED OUT TOWARD THE RWY WITHOUT DIFFICULTY. A XBLEED START ON THIS ACFT CALLS FOR 60 PSI OF AIR PRESSURE AND THIS REQUIRES THE R ENG TO BE SPOOLED UP TO ABOUT 75-80 PERCENT THRUST. THE TXWY WAS COVERED WITH ABOUT 1/8 OF AN INCH OF 'BLACK' ICE WITH RAIN FALLING ON IT. I SLOWED THE ACFT TO ABOUT 1 TO 2 MI PER HR WITH BRAKES AND DIRECTED THE FO TO START THE L ENG CONCURRENTLY, BRINGING THE THRUST UP ON THE R ENG.

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.