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ASN Wikibase Occurrence # 199487
Last updated: 5 October 2019
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Type:Silhouette image of generic PAY2 model; specific model in this crash may look slightly different
Piper PA-31T Cheyenne II
Owner/operator:Michael D Spear
Registration: N85HB
C/n / msn: 31T-8120021
Fatalities:Fatalities: 3 / Occupants: 3
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Mattapan, 6 miles from Logan International Airport, Boston, Massachuse -   United States of America
Phase: Approach
Departure airport:
Destination airport:Logan International Airport, Boston, Mass (BOS/KBOS)
The pilot noted an over torque condition on the left engine during an ILS approach to Boston. He made a go-around and initiated another approach with the engine shut down. However, he was unable to maintain altitude and the aircraft began a decent that was not arrested.

Subsequently, it crashed into two homes, at Mattapan, approximately 6 miles from the airport. An examination of the left engine revealed the drive shaft from the fuel pump to the fuel control was sheared at the plastic coupling. Further examination revealed the twin bearings that supported the driveshaft had failed. Also, there was evidence that the drive shaft had shifted and subsequently an over-torque condition resulted.

The NTSB determined the probable cause to be: The pilot's improper in-flight planning/decision, which resulted in his failure to maintain control of the aircraft. Factors related to the accident were: failure of the left fuel control unit and the adverse weather conditions


1. NTSB Identification: NYC90FA199:
2. FAA:

Revision history:

07-Sep-2017 21:54 Dr. John Smith Added

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