# NTSB FTW97LA322: Rockwell S-2R, N4893X, Columbus, NM, August 21, 1997 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: August 21, 1997, 14:35 local (20:35 UTC) - Place: Columbus, NM - Location: 31.8274° N, 107.6423° W: Placed by OpenAirDocs: center of Columbus, NM, within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=31.8274&lon=-107.6423&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report November 10, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 20323 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW97LA322 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/20323/pdf - Page: https://openairdocs.org/ntsb/FTW97LA322 ## Probable cause a loss of engine power due to failure of an exhaust side rocker box and valve mechanism, and pilot incapacitation due to loss of consciousness after being struck in the head by parts separating from the engine. ## 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, maneuvering - aerial application - engine assembly,rocker arm/tappet - separation (cause) - engine assembly,valve,exhaust - separation (cause) - Loss of control - in flight, maneuvering - aerial application - aircraft control - uncontrolled, pilot in command (cause) - incapacitation(loss of consciousness), pilot in command (cause) - In flight collision with terrain/water, descent - uncontrolled ## Analysis The airplane impacted terrain following a loss of engine power while maneuvering. The pilot stated 'on the final pass [he] pulled up out of the field and initiated a turn towards Deming, when an object came through the right corner windshield striking [him] in the head,' rendering him unconscious. A witness who was approximately 1 mile from the accident site stated that he saw the airplane 'flying straight and then nose into the ground.' The witness did not hear any engine noises. Several workers, in a nearby field, reported that they observed the airplane pull out of the field and start to turn, when the engine quit. The owner examined the engine and determined that the exhaust side rocker box and exhaust valve mechanism had broken off the number 7 cylinder. There was a 'deep groove' on the back side of a propeller blade. The owner stated that the rocker box could have been ejected from the engine and contacted a propeller blade which deflected the rocker box into the cabin. ## Factual narrative On August 21, 1997, at 1435 mountain daylight time, a Rockwell S-2R agricultural airplane, N4893X, owned and operated by Farm and Ranch Aviation Company, Deming, New Mexico, was substantially damaged when it impacted terrain following a loss of engine power, while maneuvering near Columbus, New Mexico. The commercial pilot, sole occupant, received serious injuries. Visual meteorological conditions prevailed for the Title 14 CFR Part 137 aerial application flight. The flight originated from a farm strip in Certzalia, New Mexico, at 1420, and no flight plan was filed. The pilot reported in the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) that he had just completed an aerial application order for a farm located 12 miles west Columbus, New Mexico, when the accident occurred. The pilot stated the following; "on the final pass [he] pulled up out of the field and initiated a turn towards Deming, when an object came through the right corner windshield striking [him] in the head." The pilot was rendered unconscious. He regained consciousness as the left wing contacted the ground, and the airplane cartwheeled coming to rest upright in brush covered, desert like terrain. A witness who was approximately 1 mile from the accident site stated that, he saw the airplane "flying straight and then nose into the ground." He added that, he did not hear any engine noises. Several witnesses in a nearby field, reported to the pilot that when he started to pull the airplane out of the field and turn, the engine quit. Examination of the aircraft wreckage by an FAA representative revealed that the wreckage was distributed along a path 75 yards in length. The engine and engine mounts were separated from the airframe. The propeller blades were bent in a "horse shoe" shape. The left wing was twisted, torn and bent upwards. A portion of the left wing was located 20 yards from the main wreckage. The right wing separated from the airplane and remained intact. The right main landing gear and tail wheel separated from the airplane. Control cable continuity was established to the ailerons and elevator. The engine was examined by the owner. The owner reported that it "appears" that the exhaust side rocker box and exhaust valve mechanism broke away from the number 7 cylinder. There was a "deep groove" on the back side of a propeller blade. The owner stated that the rocker box could have been ejected from the engine and contacted a propeller blade, which deflected the rocker box into the cabin. No further examination of the aircraft was conducted. ## Aircraft - Registration: [N4893X](https://openairdocs.org/deregistered/N4893X-2013-12-11), registration cancelled 2013-12-11, S/N 2078R, built 1974 (OpenAirDocs) - Reported make and model: Rockwell S-2R - Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2078R - Engines: P&W R-1340-AN1 600 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Robert J. Mamuzich - Registered owner: Farm And Ranch Aviation Co. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, March 1, 1997, 80 hours before - Departed: DMN, DEMING, NM ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 63; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 17,000 total, 10,000 in this make and model, 17,000 as pilot in command, 300 in the last 90 days, 100 in the last 30 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 200° at 5 knots, gusting 10 - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 97 °F ## 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 19970821030539A](https://openairdocs.org/incident/19970821030539A), Aug 21, 1997: Ayres S2R, Columbus, NM, Substantial damage. The aircraft was destroyed when it impacted terrain following a loss engine power while maneuvering near Columbus, new Mexico. The pilot stated the following:… 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.