# NTSB FTW96LA158: Stafford RV-4, N84PS, Longmont, CO, April 1, 1996 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: April 1, 1996, 14:49 local (21:49 UTC) - Place: Longmont, CO - Coordinates: 40.170619, -105.110733 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.1706&lon=-105.1107&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed, report July 17, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 19792 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW96LA158 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/19792/pdf - Page: https://openairdocs.org/ntsb/FTW96LA158 ## Probable cause the pilot's inadequate preflight planning and preparation in that he failed to ensure the aircraft had sufficient fuel to complete the flight. A factor was the soft terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, approach - vfr pattern - base leg/base to final - fluid,fuel - exhaustion (cause) - preflight planning/preparation - inadequate, pilot in command (cause) - lack of certification, pilot in command - lack of recent experience, pilot in command - Forced landing, emergency descent/landing - Main gear collapsed, landing - roll - terrain condition - open field - terrain condition - soft (contributing factor) - landing gear,main gear - overload - Nose over, landing - roll ## Analysis Upon arriving at the destination airport from a local cross country flight, the pilot performed three touch and go landings. While on the crosswind leg of the fourth pattern circuit, which was to culminate in a full stop landing, the engine lost power and the pilot made an emergency landing in a plowed field. During the landing roll, one main landing gear collapsed and the airplane nosed over. The flight originated with 11 gallons of fuel on board, and the duration of the flight was 54 minutes. According to the pertinent Lycoming engine chart, the fuel consumption at 75 percent power (2,450 rpm) is 10.5 gallons per hour. A review of the pilot's aero/medical data revealed him to be non-current in flight proficiency and medical certification. ## Factual narrative On April 1, 1996, at 1449 mountain standard time, a Stafford RV-4 home built, N84PS, nosed over in a field near Longmont, Colorado, during an emergency landing following a complete loss of power. The two pilots aboard received minor injuries, and the aircraft sustained substantial damage. Visual meteorological conditions prevailed for the local area personal flight operating under Title 14 CFR Part 91. No flight plan was filed. The flight originated from Greeley, Colorado, (GXY) approximately 54 minutes prior to the accident. The pilot said that at the time of the flight's departure, the airplane had 11 gallons of fuel on board. According to the pilot, after arriving in the Longmont area they conducted three touch-and-go landings and were on a cross wind leg for a full stop when the engine "abruptly" quit. The pilot said three restarts of the engine were attempted without success, and he conducted a forced landing to a plowed field. During landing roll, the right main landing gear collapsed and the aircraft nosed over. Following the accident, two FAA inspectors examined the aircraft on two occasions. The first examination took place the day of the accident. According to the attached statement provided by the FAA inspectors, they found no evidence of fuel in or around the aircraft. In addition, in a statement made to the FAA inspectors, the pilot stated he should have had approximately 12 gallons of fuel on board at the time of the accident. The same inspectors returned the following day, April 2nd, and at that time found fuel in the left tank. In addition, the right magneto was inoperative. This was attributed to impact damage by the inspectors. No other evidence was found to prevent the engine from operating. A review of the O-360-A1D engine performance information was conducted. According to the Lycoming manual (page attached) the engine at 75 percent power (2450 rpm) burns approximately 10.5 gallons per hour. A review of pilot information produced evidence that the pilot's medical certificate and his biennial flight review were not current. Attached is information provided by the pilot to document a current biennial flight review and medical certificate. Both were executed after the accident date. Also, according to the information provided in the Pilot Operator Report, the pilot had not flown in the previous 90 days prior to this flight. The pilot/passenger in the rear seat owned the airplane. He was a certified flight instructor (CFI), and was current in all respects. The flying pilot said that he was the pilot in command and that the CFI was a "passenger." The rear cockpit in this aircraft was equipped with aileron and elevator controls only. There are no rudders, throttle, mixture control, flap control or instruments. ## Aircraft - Registration: [N84PS](https://openairdocs.org/deregistered/N84PS-1997-05-05), registration cancelled 1997-05-05, S/N 832 (OpenAirDocs) - Reported make and model: STAFFORD RV-4 - Registry model: [Stafford Paul S RV-4](https://openairdocs.org/model/stafford-paul-s-rv-4) (registry code 05608EN) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 832 - Airframe hours: 616 - Engines: Lycoming O-360-A1D 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: William J. Mansfield - Registered owner: Donald C. Blessing - Airworthiness certificate: Special, Experimental (Special) - Last inspection: AAIP, June 10, 1995, 98 hours before - Departed: GXY, GREELEY, CO - Destination: 2V2 - Airport: 2V2, Vance Brand, runway 11, 5,130 × 75 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 51; private; airplane ratings: single-engine land; medical: class 3, invalid medical for flight; seat: front; flight hours: 666 total, 490 in this make and model, 640 as pilot in command, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 70° at 8 knots - Lowest ceiling: none - Temperature: 72 °F - Observed at: 2V2, 1 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 19960401005739A](https://openairdocs.org/incident/19960401005739A), Apr 1, 1996: Amtr RV4, Longmont, CO, Substantial damage. Practicing touch and go landings when engine quit, landed in a field and flipped over. 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.