Accident Pilatus PC-12/45 N96WF, Wednesday 16 October 2002
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Date:Wednesday 16 October 2002
Type:Silhouette image of generic PC12 model; specific model in this crash may look slightly different    
Pilatus PC-12/45
Owner/operator:The Nielsen-Wurster Group, Inc.
Registration: N96WF
MSN: 139
Year of manufacture:1996
Total airframe hrs:2627 hours
Engine model:Pratt & Whitney Canada PT6A-67B
Fatalities:Fatalities: 0 / Occupants: 4
Other fatalities:0
Aircraft damage: Substantial
Location:Trenton Mercer Airport (TTN) -   United States of America
Phase: Landing
Departure airport:Trenton, NJ (TTN)
Destination airport:Washington, VA (IAD)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The Pilatus PC-12/45 departed into instrument meteorological conditions. Just as the airplane entered clouds, loud bangs were heard from the engine and flame was observed coming the left side engine exhaust. The pilot in command pushed the nose over, aimed the airplane to where he thought the airport was, and the second pilot initiated engine shutdown. The airplane touched down long and fast, on a wet runway. The pilot intentionally yawed the airplane, and it departed the runway in a nose right 60-degree skid, and struck a chain link fence about 300 feet beyond the departure end of the runway. Examination of the engine revealed the #1 bearing had failed. Electrical pitting was found on the gears in the accessory drive between the starter-generator (SG) attach point, and the # 1 bearing. About 704 hour earlier, the SG had an unscheduled replacement. Records indicated that the SG had burn marks on the stator vanes and armature; however, the initiating event for the SG failure was not determined. Other engines were identified as having experienced electrical discharge damage (EDD), all of which preceded the accident. Each event occurred on a multi-engine airplane and resulted in an in-flight shutdown, followed by a single engine landing. None of the starter generators that were identified as the source of the EDD were original equipment manufacturer (OEM), and all had been previously overhauled. Additional engines were identified as having experienced EDD; however, the records on the engines were incomplete, and there was no starter generator history to review. Goodrich published an overhaul manual for the starter-generator. In the manual they stated that only Goodrich replacement parts should be used, and the use of non-Goodrich parts would void their warranty. However, there was no FAA requirement that the overhaul be conducted by an FAA approved repair station, or that only Goodrich parts be used as replacement items

Probable Cause: A power loss, due to failure of the No. 1 bearing, which was a result of previous electrical discharge damage (EDD). Factors were the low ceiling and a wet runway.

Accident investigation:
Investigating agency: NTSB
Report number: NYC03FA008
Status: Investigation completed
Download report: Final report




Revision history:

02-Apr-2008 12:03 harro Added
03-Feb-2010 23:53 TB Updated [Narrative]
21-Dec-2016 19:13 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
09-Dec-2017 17:54 ASN Update Bot Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative]

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