# NTSB NYC86LA081: Dassault DA-10, N821LG, Coatsville, PA, February 28, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: February 27, 1986, 22:30 local (Feb 28, 1986, 03:30 UTC)
- Place: Coatsville, PA
- Coordinates: 39.980693, -75.809181 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.9807&lon=-75.8092&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 5 minor, 1 uninjured
- Status: Completed, report June 27, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 30305
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC86LA081
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30305/pdf
- Page: https://openairdocs.org/ntsb/NYC86LA081

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, cruise
  - maintenance - inadequate, other maintenance personnel (contributing factor)
  - electrical system,generator - worn (cause)
  - electrical system,generator - failure,total (cause)
  - electrical system,battery - exhaustion
  - electrical system - inoperative
  - comm/nav equipment - inoperative
  - flt control syst,stabilator trim - inoperative
  - flight control,flap - inoperative
  - landing gear,steering system - inoperative
  - landing gear,anti-skid brake system - inoperative
  - thrust reverser - inoperative
- Loss of control - on ground/water, landing - roll
  - light condition - dark night (contributing factor)
  - performed
  - precautionary landing - performed
  - directional control - not maintained, pilot in command (contributing factor)
  - ground loop/swerve - uncontrolled
- Overrun, landing - roll
  - powerplant controls - improper use of, pilot in command (contributing factor)
- On ground/water collision with object, landing - roll
- On ground/water encounter with terrain/water, landing - roll

## Analysis

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.

## Aircraft

- Registration: N821LG (not matched to a registry record)
- Reported make and model: DASSAULT DA-10
- Category: Airplane
- Serial number: 170
- Airframe hours: 1447
- Engines: AIRESEARCH TFE-731-2-1C 3230 lbs thrust turbo fan
- Damage: Substantial damage
- Flight: Executive/Corporate, Part 91
- Registered owner: Seneca Livestock Co.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, January 10, 1986, 46 hours before
- Departed: JFK, NEW YORK, NY
- Destination: LEX, LEXINGTON, KY
- Flight plan: IFR
- Airport: 40N, Chester County, runway 29, 4,600 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 8,260 total, 963 in this make and model, 8,021 as pilot in command, 89 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: calm
- Lowest ceiling: none

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19860227075739A](https://openairdocs.org/incident/19860227075739A), Feb 27, 1986: Amd FALCON10, Coatesville, PA, Substantial damage. Lost directional control during landing after electrical failure en route. Competency of crew a factor.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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