# NTSB MIA95LA181: Rockwell S-2R, N8440V, Lambert, MS, July 11, 1995 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: July 11, 1995, 10:00 local (15:00 UTC) - Place: Lambert, MS - Coordinates: 34.199493, -90.279174 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.1995&lon=-90.2792&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report October 13, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 37799 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA95LA181 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/37799/pdf - Page: https://openairdocs.org/ntsb/MIA95LA181 ## Probable cause UNSUITABLE TERRAIN ENCOUNTERED DURING THE FORCED LANDING. CONTRIBUTING TO THE ACCIDENT WAS THE PARTIAL LOSS OF ENGINE POWER DUE TO FAILURE OF THE NO. 4 CYLINDER INTAKE VALVE ROCKER ARM BOSSES. ## 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, cruise - normal - engine assembly,rocker arm/tappet - failure,total (contributing factor) - engine assembly,valve,intake - disabled (contributing factor) - Forced landing, emergency descent/landing - terrain condition - none suitable - Loss of control - in flight, emergency descent/landing - airspeed - not maintained, pilot in command (cause) - stall - inadvertent, pilot in command - In flight collision with terrain/water, descent - uncontrolled ## Analysis THE PILOT STATED THAT SHORTLY AFTER TAKEOFF THE ENGINE EXPERIENCED PARTIAL LOSS OF POWER AND HE OBSERVED SMOKE FROM THE RIGHT SIDE OF THE ENGINE. HE INITIATED DUMPING OF THE CHEMICAL AND WHILE MANEUVERING TO AVOID OBSTRUCTIONS, THE AIRPLANE STALLED, IMPACTED THE GROUND THEN NOSED OVER. EXAMINATION OF THE ENGINE REVEALED THAT THE NO. 4 CYLINDER INTAKE VALVE ROCKER ARM BOSSES FAILED. THE ENGINE HAD ACCUMULATED ABOUT 305 HOURS SINCE OVERHAUL AT THE TIME OF THE ACCIDENT. THE TOTAL TIME OF THE CYLINDER WAS NOT DETERMINED. ## Factual narrative On July 11, 1995, about 1000 central daylight time, a Rockwell International S-2R, N8440V, registered to and operated by M & M Air Service, Inc., crashed shortly after takeoff from a private airstrip near Lambert, Mississippi. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 137 aerial application flight. The airplane was destroyed by a postcrash fire and the commercial-rated pilot sustained minor injuries. The flight originated about 5 minutes before from the operator's private airstrip. The pilot stated that shortly after takeoff during cruise flight, the engine experienced a partial loss of power and smoke was observed near the right side of the engine. He initiated dumping of the chemical and while maneuvering to avoid obstructions, the airplane stalled, impacted the ground then nosed over. A postcrash fire destroyed the airplane. Examination of the engine revealed that the No. 4 cylinder intake valve, rocker arm bosses failed. Review of the engine logbook revealed that the engine was overhauled on May 6, 1994, and had accumulated about 305 hours since overhaul. The total time of the cylinder was not determined. ## Aircraft - Registration: [N8440V](https://openairdocs.org/deregistered/N8440V-1996-06-17), registration cancelled 1996-06-17, S/N 2200R (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) - Category: Airplane - Serial number: 2200R - Airframe hours: 7533 - Engines: P&W R-1340-AN1 600 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Aerial application, Part 137 - Registered owner: M & M Air Service, Inc. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, March 17, 1995, 218 hours before ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 7,445 total, 5,153 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 100° at 6 knots - Visibility: 8 statute miles - Lowest ceiling: none - Temperature: 84 °F, dew point 72 °F - Altimeter: 30.00 inHg - Observed at: MEM, 52 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 19950711022499A](https://openairdocs.org/incident/19950711022499A), Jul 11, 1995: Ayres S2RR1340REST, Lambert, MS, Destroyed. After departure loss of power. Engine smoke. Stalled dumping load and avoiding obstacles. Cylinder bosses failed. 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.