# NTSB IAD97LA113: Haines Revolution Mini 500, N7240E, N Philadelphia, OH, August 23, 1997 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 23, 1997, 10:45 local (14:45 UTC) - Place: N Philadelphia, OH - Coordinates: 40.480903, -81.440803 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.4809&lon=-81.4408&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report June 10, 1999 - Report: Approved by Office Director - NTSB case key (mKey): 28227 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD97LA113 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/28227/pdf - Page: https://openairdocs.org/ntsb/IAD97LA113 ## Probable cause A leak on the exhaust manifold which resulted in a loss of engine power. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - exhaust system,manifold/pipe - leak (cause) - Forced landing, descent - emergency - autorotation - performed, pilot in command - Hard landing, descent - emergency ## Analysis According to the pilot, he satisfactorily completed a pre-takeoff check, which included checking the exhaust gas temperature gage for correct temperatures. He then departed into the wind. The pilot reported that about 50 feet AGL, and airspeed about 30 to 40 mph, he noticed the main rotor slowing down and he added power with no results. He entered autorotation, but the rotor speed was inadequate to perform a successful autorotation, and the helicopter touched down hard. An engine examination revealed a half inch crack within a welded seam in the mid section of the exhaust manifold. The pilot reported that the exhaust manifold was delivered from the factory with the weld. The helicopter had a total of 56 hours since new. ## Factual narrative On August 23, 1997, at 1045 eastern daylight time, a homebuilt Revolution Mini 500, a helicopter, N7240E, was substantially damaged when it collided with the ground during a forced landing near the Harry Clever Field, New Philadelphia, Ohio. The certificated private pilot was not injured. Visual meteorological conditions prevailed and no flight plan had been filed. The local, personal flight that originated at New Philadelphia, was conducted under 14 CFR Part 91. According to the pilot, he had completed a pre-takeoff check, which included checking both ignition systems, and engine split test for correct operation of the sprague clutch. He established the helicopter at a hover for about 2 minutes, checking the exhaust gas temperature gage for correct temperatures. All checks were satisfactorily completed and then he departed. The pilot reported that shortly after takeoff into the wind, at an altitude of about 50 feet and airspeed of about 35-40 mph, he noticed the main rotor slowing down. He immediately applied power with no results. Shortly thereafter, the engine lost power. He said he entered autorotation, but he did not have enough rotor speed to perform a successful autorotation, and the helicopter touched down hard. The helicopter was moved to an overhaul facility in Newcomertown, Ohio, and was examined by a Federal Aviation Administration (FAA) Inspector. The Inspector stated that the examination revealed that more than 75 percent of the electrodes of the rear cylinder spark plugs (magneto side) were burned. According to the Rotax Operator's manual, it stated in part: "If both plugs have 'white' electrodes with 'melt' droplets, first suspect lean mixture." According to the FAA Inspector, examination of the exhaust manifold revealed a half inch crack within a welded seam, mid section of the exhaust manifold in the center section. According to the owner, the helicopter had a total of 56 hours since new, and the spark plugs were installed about 30 hours prior. The spark plug installed in the forward cylinder was of the same type, and its electrode indicated "normal" wear. The owner also said that the exhaust manifold was delivered from the factory with the weld. According to the Rotax Operator's Manual, it stated in part: "This is not a certificated aircraft engine. It has not received any safety or durability testing, and conforms to no aircraft standards. It is for use in experimental, uncertificated aircraft and vehicles only in which an engine failure will not compromise safety. User assumes all risk of use, and acknowledges by his use that he knows this engine is subject to sudden stoppage." ## Aircraft - Registration: [N7240E](https://openairdocs.org/deregistered/N7240E-2017-02-28), registration cancelled 2017-02-28, S/N 0362, built 1997 (OpenAirDocs) - Reported make and model: HAINES REVOLUTION MINI 500 (REVOLUTION) - Registry model: [Haines John R REVOLUTION MINI 500](https://openairdocs.org/model/haines-john-r-revolution-mini-500) (registry code 05604HO) (OpenAirDocs) - Registry engine: [Bombardier ROTAX (ALL)](https://openairdocs.org/engine/bombardier-rotax-all) (registry code 09050, reciprocating) (OpenAirDocs) - Category: Helicopter, amateur-built - Serial number: 0362 - Airframe hours: 56 - Engines: Rotax 582 67 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: John P Haines - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, March 26, 1997, 56 hours before - Departed: PHD ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 1,800 total, 56 in this make and model, 1,600 as pilot in command, 60 in the last 90 days, 30 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 280° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: 2,000 ft broken - Temperature: 63 °F, dew point 55 °F - Altimeter: 30.00 inHg - Observed at: CAK, 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 19970823023489A](https://openairdocs.org/incident/19970823023489A), Aug 23, 1997: Amtr MINI500, New Philadelphi, OH, Substantial damage. Engine failed not enough altitude or rotor speed for successful autoratation. (.4) according to the pilot, he satisfactorily completed a pre-takeoff check,… 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.