Accident Cessna 421C N6089X, Wednesday 18 July 1990

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Date:	Wednesday 18 July 1990
Time:	09:33 LT
Type:	Cessna 421C
Owner/operator:	Pacifica Corporation
Registration:	N6089X
MSN:	421C0887
Engine model:	Continental GTSI-O-520-L
Fatalities:	Fatalities: 0 / Occupants: 5
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Lancaster, CA - United States of America
Phase:	Initial climb
Nature:	Executive
Departure airport:	(KWJF)
Destination airport:	Apple Valley, CA (APV
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
ERODED IGNITION SPARK PLUG ELECTRODES AND MAINTENANCE PERSONNEL NEGLECTING TO ADJUST SPARK PLUG ELECTRODES AND MAINTENANCE PERSONNEL NEGLECTING TO ADJUST SPARK PLUG GAP. THE ROUGH TERRAIN IN WHICH THE AIRCRAFT LANDED WAS A FACTOR IN THE ACCIDENT.

Probable Cause: THE ACCIDENT WAS ERODED IGNITION SPARK PLUG ELECTRODES AND MAINTENANCE PERSONNEL NEGLECTING TO ADJUST SPARK PLUG ELECTRODES AND MAINTENANCE PERSONNEL NEGLECTING TO ADJUST SPARK PLUG GAP. THE ROUGH TERRAIN IN WHICH THE AIRCRAFT LANDED WAS A FACTOR IN THE ACCIDENT.

Accident investigation: