# NTSB LAX95LA149: Bulsky Skybolt, N94BV, Goodyear, AZ, March 31, 1995 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: March 30, 1995, 18:05 local (Mar 31, 1995, 01:05 UTC) - Place: Goodyear, AZ - Coordinates: 33.369792, -112.380027 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.3698&lon=-112.3800&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report August 23, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 29064 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX95LA149 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/29064/pdf - Page: https://openairdocs.org/ntsb/LAX95LA149 ## Probable cause fuel starvation due to the partial failure of the fuel pump caused by the broken crankshaft idler gear attachment screw lockplate. The unsuitable terrain and trees were factors in this accident. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, cruise - fluid,fuel - starvation (cause) - engine assembly,gear - loose part/bolt/nut/clamp/etc (cause) - fuel system,pump - disengaged (cause) - Forced landing, descent - emergency - terrain condition - none suitable (contributing factor) - In flight collision with object, descent - emergency - object - tree(s) (contributing factor) ## Analysis DURING THE LOCAL AREA FLIGHT, THE ENGINE CRANKSHAFT IDLER GEAR LOCKPLATE BROKE WHICH ALLOWED THE ATTACH SCREWS TO BACK OUT. THE IDLER GEAR BECAME LOOSE AND ITS GEAR TEETH WERE DAMAGED. A PARTIAL FAILURE OF THE ENGINE-DRIVEN FUEL PUMP, WHICH IS OPERATED BY THE IDLER GEAR, CAN ALLOW THE ENGINE POWER TO SUDDENLY REDUCE TO IDLE. DURING THE SUBSEQUENT EMERGENCY LANDING, THE AIRPLANE COLLIDED WITH SOME TREES AND BUSHES. ## Factual narrative On March 30, 1995, at 1805 hours mountain standard time, a Bulsky Skybolt experimental airplane, N94BV, collided with some trees and bushes during an emergency landing about 8 miles southwest of Phoenix Goodyear Municipal Airport, Goodyear, Arizona. The emergency landing resulted from a sudden loss of engine power. The pilot was conducting a local visual flight rules personal flight. The airplane, registered to and operated by the pilot, was destroyed. Neither the certificated commercial pilot nor his passenger was injured. Visual meteorological conditions prevailed. The flight originated at the Phoenix Goodyear Municipal Airport about 1715 hours. The pilot told National Transportation Safety Board investigators in a telephone interview conducted on March 31, 1995, that he was returning to the departure airport when the engine power reduced to idle. The pilot immediately executed an emergency landing to a dirt road. During the landing rollout, the airplane wing struck a cactus bush and nosed over. The pilot also said the airplane had " . . . a lot of fuel . . . ." The pilot repeated his telephone statement in the accident report. He added, however, that the terrain was covered with rocks, trees, bushes, and "big cactus." During the emergency landing, he intentionally struck the trees to absorb the initial impact energy. On April 20, 1995, maintenance personnel disassembled the engine, a Lycoming IO-540-T4A5, for examination at Air Transport, Phoenix, Arizona. A Federal Aviation Administration (FAA) airworthiness inspector from Scottsdale (Arizona) Flight Standards District Office supervised the examination. The inspector reported that the oil screen contained ferrous and nonferrous metal. The crankshaft idler gear, part No. LW-10290, was found loose and damaged. The inspector said that two screws, part No. STD-1838, that attach the crankshaft idler gear shaft to the engine case, were "backed-out". The lockplate, used to safety the attachment screws, was broken into several pieces. The pieces were found in the oil pan. The inspector reported that the fuel pump is operated by the crankshaft idler gear. ## Aircraft - Registration: [N94BV](https://openairdocs.org/deregistered/N94BV-1996-07-18), registration cancelled 1996-07-18, S/N 1 (OpenAirDocs) - Reported make and model: BULSKY SKYBOLT - Registry model: [Cybulski Daniel P SKYBOLT](https://openairdocs.org/model/cybulski-daniel-p-skybolt) (registry code 05625CW) (OpenAirDocs) - Category: Airplane - Serial number: 1 - Airframe hours: 160 - Engines: LYCOMING IO-540-T4A5 260 horsepower reciprocating - Damage: Destroyed - Flight: Personal, Part 91 - Registered owner: Kaelberer, Gunther - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, May 26, 1994, 40 hours before - Departed: GYR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: rear; flight hours: 6,683 total, 45 in this make and model, 6,200 as pilot in command, 98 in the last 90 days, 58 in the last 30 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 170° at 5 knots - Visibility: 50 statute miles - Lowest ceiling: none - Temperature: 75 °F - Altimeter: 29.00 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 19950330006449A](https://openairdocs.org/incident/19950330006449A), Mar 30, 1995: Amtrsn SKYBOLT, Goodyear, AZ, Destroyed. Engine went to idle. Landed on dirt road. Struck cactus. Nosed over. Bolts came out of crankshaft idler gear. 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.