Boeing A75N1 N90840

Summary

On 22 May 1987 at about 23:00 local time, a Boeing A75N1 registered N90840 was involved in an accident near San Ardo, California, United States. One person was on board and one was seriously injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

22 May 1987 at 23:00

Classification

Accident

Location

San Ardo, California, United States

Coordinates

36.0905, -120.8204

Aircraft

Boeing A75N1

Registration

N90840

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Oceano → San Rafael

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX87LA214

1 person was seriously injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

DURING A PLEASURE CROSS COUNTRY FLIGHT, THE ENGINE EXPERIENCED A PARTIAL LOSS OF ENGINE POWER. THE PLT MADE A FORCED LANDING WHERE PRIOR TO TOUCHDOWN THE ACFT COLLIDED WITH POWER LINES THEN CONTACTED THE TERRAIN IN APRX THREE FT OF WATER. THE ACFT HAS HISTORY OF FOULED SPARK PLUGS RESULTING IN A ROUGH RUNNING ENGINE. THE SPARK PLUGS WERE REMOVED AND INSPECTED, NOTING THAT THE NUMBER 4 PLUG WAS FINGER TIGHT. FRONT AND BACK PLUGS 1, 2, 6, AND 7 DISPLAYED NORMAL OPERATING SIGNATURES. NUMBERS 3, 4, AND 5 WHEN REMOVED A CONSIDERABLE AMOUNT OF A WATER AND OIL MIXTURE DRAINED. A SANDY TYPE SUBSTANCE AND VEGETATION WERE NOTED ON THE PLUGS.THERE WAS NO MECHANICAL FAILURE OR MALFUNCTION NOTED IN THE REST OF THE SYSTEM.

Quoted verbatim from the NTSB record.