NTSB Identification: NYC86LA081.
The docket is stored on NTSB microfiche number 31948.
Accident occurred Thursday, February 27, 1986 in COATSVILLE, PA
Probable Cause Approval Date: 06/27/1989
Aircraft: DASSAULT DA-10, registration: N821LG
Injuries: 5 Minor,1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

AS THE ACFT WAS CLIMBING THRU 19,000' AT NGT, THE #2 GENERATOR (GEN) LGT CAME ON. THE FLT CREW NOTED THERE WAS NO OUTPUTFM THE #2 GEN & IT WOULD NOT RESET. THEY THEN CHECKED THE #1 GEN VOLTAGE & NOTED IT WAS 14 TO 15 VOLTS. THE CREW REDUCEDTHE ELEC LOAD; HOWEVER, ABOUT 5 MIN LATER, THE BATTERIES BCM DISCHARGED & THERE WAS A TOTAL LOSS OF ELEC PWR. USING A FLASHLIGHT, THE CREW DIVERTED TO THE CHESTER COUNTY ARPT WHICH HAD A 4600' RWY. THE GEAR WAS EXTDD WITH THE EMERG SYS. THE ELEV TRIM WAS INOP, SO BOTH PLTS APPLIED BACK PRESSURE ON THE YOKE TO OVERCOME THE NOSE DWN TENDENCY. AFTER LNDG ABOUT 1/4 OF THE WAY DWN THE RWY, THE CREW TRIED TO USE THE THRUST REVERSERS, BUT THE REVERSERS WERE INOP. SUBSEQUENTLY,THE ACFT CONTD OFF THE SIDE & BEYOND THE END OF THE RWY, HIT A WOODEN BEAM & A SNOWBANK, THEN CAME TO REST IN A DITCH. AN INV REVEALED A SHAFT FAILURE OF THE #2 GEN (STARTER/GEN) & WORN BRUSHES IN THE #1 GEN. WITH TOTAL ELEC FAILURE, THE FLWG WERE ALSO INOP: WING FLAPS, ANTI-SKID, CAPT'S AIRSPEED IND & ALTIMETER, NOSEWHEEL STEERING, COCKPIT LIGHTING.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ELECTRICAL SYSTEM,GENERATOR..WORN

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ELECTRICAL SYSTEM,GENERATOR..FAILURE,TOTAL


Contributing Factors

MAINTENANCE..INADEQUATE..OTHER MAINTENANCE PERSONNEL










Contributing Factors

LIGHT CONDITION..DARK NIGHT




Contributing Factors

DIRECTIONAL CONTROL..NOT MAINTAINED..PILOT IN COMMAND



Contributing Factors

POWERPLANT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

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