# NTSB CHI95LA266: Grumman G164B, N6771Q, Bloomington, NE, August 10, 1995 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 10, 1995, 15:30 local (20:30 UTC) - Place: Bloomington, NE - Coordinates: 40.089611, -99.030334 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.0896&lon=-99.0303&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report October 27, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 9983 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI95LA266 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/9983/pdf - Page: https://openairdocs.org/ntsb/CHI95LA266 ## Probable cause the disintegration of the engine's super charger bearings. Factors associated with the accident were the total failure of the engine's super charger and the unsuitable terrain surrounding the airplane's departure path encountered by the pilot. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, takeoff - initial climb - eng assembly,blower/impeller/integral supercharger - failure,total (contributing factor) - engine assembly,bearing - disintegrated (cause) - Forced landing, descent - emergency - unsuitable terrain or takeoff/landing/taxi area - encountered, pilot in command (contributing factor) - remedial action - attempted, pilot in command - In flight collision with terrain/water, descent - emergency - terrain condition - crop - terrain condition - ground ## Analysis THE PILOT STATED HIS ENGINE POPPED TWO TIMES AFTER TAKEOFF. BETWEEN THE FIRST AND SECOND POPPING SOUND THE ENGINE LOST POWER, REGAINED POWER AND THEN QUIT AFTER THE SECOND POPPING SOUND. THE AIRPLANE LANDED IN MATURE CORN, INVERTING BEFORE COMING TO A STOP ON THE GROUND. THE ON-SCENE INVESTIGATION REVEALED THE AIRPLANE'S ENGINE EXPERIENCED A TOTAL FAILURE OF THE SUPER CHARGER'S BEARING SYSTEM. ## Factual narrative On August 9, 1995, at 1530 central daylight time (cdt), a Grumman G164B, N6771Q, piloted by a commercial pilot, was substantially damaged during a collision with mature corn and the ground following a total loss of power shortly after takeoff. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 ferry flight was not operating on a flight plan. The pilot reported no injuries. The flight departed a restricted landing area near Bloomington, Nebraska, at 1530 cdt. The pilot said the airplane had climbed to about 500 feet above the ground after takeoff when its engine made a popping sound. The engine, according to the pilot, lost power after the first popping sound. He said it regained power, ran for a few seconds, and made a second popping sound. He said the engine stopped running shortly after the second popping sound. He said the airplane became inverted after colliding with nine foot high corn. An FAA Principal Maintenance Inspector (PMI) represented the NTSB on-scene. The PMI said the engine examination revealed its super charger bearings had been destroyed during flight. ## Aircraft - Registration: [N6771Q](https://openairdocs.org/aircraft/N6771Q), registered now, S/N 280B (OpenAirDocs) - Reported make and model: GRUMMAN G164B - Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs) - Category: Airplane - Serial number: 280B - Airframe hours: 3860 - Engines: P&W R985-14B 450 horsepower reciprocating - Damage: Substantial damage - Flight: Ferry, Part 91 - Registered owner: Duane Donovan - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, September 27, 1994, 222 hours before - Destination: CNK, CONCORDIA, KS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 30; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 4,500 total, 4,250 in this make and model, 4,500 as pilot in command, 50 in the last 90 days, 20 in the last 30 days, 9 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 60° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 72 °F - Altimeter: 29.00 inHg - Observed at: HSI, 30 nm away ## 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 19950810023829A](https://openairdocs.org/incident/19950810023829A), Aug 10, 1995: Scwzer G164B, Bloomington, NE, Substantial damage. Lost power on climbout to 500 ft. landed in tall corn and flipped over. Supercharger bearings were destroyed. ## Other investigations on N6771Q (1) 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. - [NTSB MIA78DKT21](https://openairdocs.org/ntsb/MIA78DKT21), Dec 14, 1977: Grumman G-164B (N6771Q), Clewiston, FL, destroyed 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.