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ASN Wikibase Occurrence # 132903
Last updated: 26 November 2021
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Date:25-SEP-1994
Time:13:50
Type:Silhouette image of generic P32T model; specific model in this crash may look slightly different
Piper PA-32RT-300T
Owner/operator:Aero Haven, Inc.
Registration: N39658
MSN: 32R-7887135
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:San Mateo, CA -   United States of America
Phase: Initial climb
Nature:Private
Departure airport:SQL
Destination airport:L35
Investigating agency: NTSB
Narrative:
On September 25, 1994, at 1350 hours Pacific daylight time, a Piper PA-32RT-300T, N39658, lost engine power after takeoff and was forced to land on a residential street in San Mateo, California. The airplane was being operated by Aero Haven, Inc., Big Bear City, California, as a personal flight. The airplane was destroyed. The certificated private pilot and passenger received serious injuries. The flight originated from the San Carlos Airport, San Carlos, California, about 1345 hours and was destined for Big Bear City. Visual meteorological conditions prevailed.

The pilot stated the engine quit abruptly 1,000 to 1,500 feet above the ground over a city. The pilot manipulated the throttle in order to regain power. After getting no response, he elected to land on a residential street. The airplane struck wires during the initial flare and then struck an automobile and finally a brick wall during the ground run.

The airplane's maintenance records revealed the engine had been overhauled by a Federal Aviation Administration (FAA) certified repair station on May 5, 1994, about 150 flight hours before the accident. The repair station certified the airplane to be airworthy after the engine was reinstalled and returned the airplane to service.

The airplane's engine was examined at the El Monte Airport, El Monte, California, on October 21, 1994. Examination of the magneto revealed internal corrosion and electrical arcing at the breaker points. The impulse coupling was found intact and functioned. The insulation on the "P" lead wire was cracked along its entire length exposing bare wire at one point.

According to the engine manufacturer, the "P" lead wire connects the magneto's coil with the ignition switch. With the ignition switch in the off position, the "P" lead grounds the primary current. With the "P" lead grounded, the opening of the breaker points does not interrupt the primary current, preventing any build up of voltage in the primary circuit. Without primary voltage, the magneto will not fire the spark plugs. Grounding of the "P" lead as a result of a bare wire touching the airframe would have the same effect as the ignition switch in the off position.
PROBABLE CAUSE:A deteriorated magneto grounding ('P' lead) and failure of maintenance personnel to detect this condition when the engine was reinstalled in the airframe after overhaul. The lack of suitable terrain for the forced landing was a factor.

Sources:

NTSB id 20001206X02300


Revision history:

Date/timeContributorUpdates
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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