# NTSB MIA98LA236: Hall Revolution Mini 500, N9GH, Hattiesburg, MS, August 30, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 30, 1998, 16:30 local (21:30 UTC) - Place: Hattiesburg, MS - Coordinates: 31.310865, -89.300224 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=31.3109&lon=-89.3002&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report April 6, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 43894 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA98LA236 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/43894/pdf - Page: https://openairdocs.org/ntsb/MIA98LA236 ## Probable cause The failure of the pilot to maintain main rotor rpm during a forward hover and the cyclic grip separating during the resultant bounced landing resulting in the pilot losing cyclic control and the main rotor contacting the tail boom. A factor in the accident was the pilot's lack of total time in the make and model. ## Analysis The pilot stated that as he hovered forward at a brisk walk, he heard the low rotor rpm horn. He lowered the collective and the helicopter descended rapidly and touched down on the 'toes' of the skids. The helicopter bounced back into the air and the cyclic control grip separated from the cyclic control stick. The cyclic control moved to the full aft position and the main rotor blades contacted the tail boom. ## Factual narrative On August 30, 1998, about 1500 central daylight time, a Hall Revolution Mini 500 homebuilt helicopter, N9GH, registered to an individual, landed hard at Hattiesburg, Mississippi, while on a Title 14 CFR Part 91 personal flight. Visual meteorological conditions prevailed at the time and no flight plan was filed. The airline transport-rated pilot was not injured and the helicopter received substantial damage. The flight was originating at the time of the accident. The pilot stated that as he hovered forward at a brisk walk, he heard the low rotor rpm horn and reduced the collective control. The helicopter descended rapidly and touched down on the "toes" of the skids. The helicopter bounced back into the air and the cyclic control grip separated from the cyclic control stick. The cyclic control stick moved to the full aft position and the main rotor blades contacted the tail boom. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Hard landing, hover - rotor rpm - not maintained, pilot in command (cause) - lack of total experience in type of aircraft, pilot in command (contributing factor) - descent - uncontrolled, pilot in command - Airframe/component/system failure/malfunction, landing - flare/touchdown - rotorcraft flight control,cyclic control - separation (cause) - Miscellaneous/other, other - misc rotorcraft,main rotor/tail boom contact ## Aircraft - Registration: [N9GH](https://openairdocs.org/deregistered/N9GH-2013-08-22), registration cancelled 2013-08-22, S/N 288, built 1997 (OpenAirDocs) - Reported make and model: Hall REVOLUTION MINI 500 (REVOLUTION) - Registry model: [Hall George D REVOLUTION MINI-500](https://openairdocs.org/model/hall-george-d-revolution-mini-500) (registry code 05604V2) (OpenAirDocs) - Registry engine: [Bombardier ROTAX (ALL)](https://openairdocs.org/engine/bombardier-rotax-all) (registry code 09050, reciprocating) (OpenAirDocs) - Category: Helicopter, amateur-built - Serial number: 288 - Airframe hours: 99 - Engines: Bombardier 582 67 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Frederick M. Jones - Registered owner: George D. Hall - Airworthiness certificate: Special, Experimental (Special) - Departed: HBG - Airport: HGB, Bobby L. Chain Munc. ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; flight instructor, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 6,400 total, 1 in this make and model, 100 in the last 90 days, 20 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 79 °F - Altimeter: 29.00 inHg - Observed at: GPT, 50 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 19980830032099A](https://openairdocs.org/incident/19980830032099A), Aug 30, 1998: Amtr MINI500, Hattiesburg, MS, Substantial damage. On August 30, 1998, about 1500 central daylight time a hall revolution mini 500 homebuilt helicopter, N9GH, registered to an individual, landed hard at… 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.