# NTSB IAD96LA092: Beech V35B, N369JR, Westminster, MD, June 7, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 7, 1996, 11:30 local (15:30 UTC) - Place: Westminster, MD - Coordinates: 39.569911, -77.00016 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.5699&lon=-77.0002&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 31, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 28062 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD96LA092 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/28062/pdf - Page: https://openairdocs.org/ntsb/IAD96LA092 ## Probable cause The fracture of the engine crankshaft which had a subsurface origin and progressed in fatigue until overload and separation occurred. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, climb - to cruise - engine assembly,crankshaft - fatigue (cause) - engine assembly,crankshaft - fractured (cause) - Forced landing, emergency descent/landing - Wheels up landing, emergency descent/landing ## Analysis According to the pilot, the preflight, taxi and runup were normal. After takeoff, he retracted the landing gear, climbed to 2000 feet mean sea level, and after he steadied on his outbound heading, the pilot stated he reduced RPM. His normal amount of control input for reduction in RPM brought about too large of a reduction in power and was associated with a rough engine at first, and then a loss of engine sounds. After lowering the nose of the airplane, he changed fuel tanks, checked individual magnetos and turned back towards the airport. It was at this time that the pilot believed he heard a knock and shortly thereafter, the propeller stopped windmilling. His attention was now focused on choosing a field in which to land. He altered his selection of a field based on some trees, and when he saw that he had his alternate field made, he selected the gear down. The pilot stated that the landing gear did not have enough time to extend and the airplane slide on a mowed hay field for approximately 300 feet. ## Factual narrative HISTORY OF FLIGHT On June 7, 1996, at 1145 eastern daylight time, a Beech V35B, N369JR, loss engine power during departure from Carroll County Regional Airport in Westminster, Maryland. The commercial pilot, the sole occupant and registered owner of the airplane, was not injured. The airplane sustained substantial damage during the forced landing. Visual meteorological conditions prevailed and no flight plan was filed. The flight, conducted under 14 CFR Part 91, had an intended destination of Washington County Regional Airport in Hagerstown, Maryland. The pilot stated that this was the first flight of the day for the airplane. He stated that the preflight, taxi, and engine runup all seemed normal. The pilot stated that he took off on runway 16, retracted the landing gear and climbed up to approximately 2000 feet mean sea level on a westerly heading. The pilot acknowledged that it was at this time that he reduced engine RPM. He stated that the power decrease was too large for the small input he had made on the engine controls and was associated with a rough engine. The pilot then stated that this was followed by the loss of engine sounds. After lowering the nose of the airplane, the pilot indicated that he changed fuel tanks, checked individual magnetos and turned back towards the airport. It was at this time that the pilot believed he heard a knock and shortly thereafter, the propeller stopped windmilling. The pilot wrote that his attention was now focused on choosing a field in which to land. The pilot stated that he altered his selection of a field due to some trees and when he had his alternate field made he selected the gear down. The pilot stated that the gear did not have time to extend and the airplane slide approximately 300 feet on mowed hay. AIRCRAFT INFORMATION The engine on the airplane was a Teledyne Continental IO-520-BA, serial number 232701-R. The engine was a factory rebuilt engine manufactured in 1981 and had 772 hours Time Since Rebuilt. There was less than five hours on the engine since the last annual inspection. WRECKAGE AND IMPACT INFORMATION The initial examination of the airplane's engine was conducted by the Federal Aviation Administration Inspector and the engine manufacturer Air Safety Investigator. They confirmed rotation and compression on all cylinders; both magnetos generated a spark when the propeller was rotated. The fuel pump coupling was found sheared and thought to be the source for the loss of power. Due to the persistence of the FAA Inspector on an inclination that something was not right, the engine manufacturer Air Safety Investigator, the National Transportation Safety Board Air Safety Investigator along with the FAA Inspector reexamined the airplane's engine. It was during this reexamination that the discontinuity of the engine's crank shaft was discovered. Subsequently, the engine was removed from the airplane and shipped for teardown. ADDITIONAL INFORMATION In September 1992, the engine manufacturer with the FAA approval, released a Mandatory Service Bulletin. This MSB dealt with the replacement of a certain make of crankshafts and identified all the affected engines. It went on to state that sufficient field service data had been accumulated and that it would be prudent to require replacement of these crankshafts. It stated that compliance should be at next overhaul or whenever the crankshaft was removed or made accessible for any reason. This engine crankshaft was of the make mentioned in the MSB. The inspection of the crankshaft during the teardown, found that it was broken at the number seven short cheek. A subsurface origin was found and progression of the fracture was in fatigue until overload and separation occurred. The engine was a factory rebuilt engine manufactured in 6-2-81. All cylinder spot putty was intact on all cylinder hold down nuts indicating the engine had not been opened since factory rebuild. ## Aircraft - Registration: [N369JR](https://openairdocs.org/deregistered/N369JR-2014-05-21), registration cancelled 2014-05-21, S/N D-9232, built 1971 (OpenAirDocs) - Reported make and model: Beech V35B - Registry model: [Beech V35B](https://openairdocs.org/model/beech-v35b) (registry code 1151548) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: D9232 - Airframe hours: 2255 - Engines: Continental IO520-BA-8 285 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Sherman G. Francisco - Airworthiness certificate: Standard, Utility - Last inspection: Annual, June 3, 1996, 5 hours before - Departed: W54, MD - Destination: HGR, HAGERSTOWN, MD - Airport: runway 16, 5,100 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 63; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 950 total, 698 in this make and model, 950 as pilot in command, 6 in the last 90 days, 2 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 200° at 6 knots - Visibility: 5 statute miles - Temperature: 79 °F, dew point 70 °F - Altimeter: 30.00 inHg ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19960607013079A](https://openairdocs.org/incident/19960607013079A), Jun 7, 1996: Beech V35B, Baltimore, MD, Substantial damage. Lost engine shortly after takeoff, landed in a field, downwind, nose gear up. Firewall prop bent, skin wrinkled. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.