# NTSB FTW00LA009: Cessna 150G, N3603J, El Reno, OK, October 9, 1999 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: October 9, 1999, 15:00 local (20:00 UTC) - Place: El Reno, OK - Coordinates: 35.539276, -97.959449 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.5393&lon=-97.9594&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor, 1 uninjured - Status: Completed, report November 30, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 47544 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW00LA009 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47544/pdf - Page: https://openairdocs.org/ntsb/FTW00LA009 ## Probable cause The total loss of engine power resulting from a fatigue failure of the intake rocker arm for the #4 cylinder. A factor was the soft terrain encountered during the forced landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, cruise - engine assembly,rocker arm/tappet - fatigue (cause) - Forced landing, descent - emergency - In flight collision with terrain/water, landing - flare/touchdown - terrain condition - soft (contributing factor) ## Analysis A total loss of engine power occurred during a dual cross-county instructional flight. During the ensuing forced landing in soft terrain, the nose landing gear collapsed. Examination of the Continental O-200-A engine, revealed that the intake rocker arm on the #4 cylinder was separated. Metallurgical examination indicated that a fatigue fracture initiated on the push rod side of the rocker arm. There was no evidence of machining defects or mechanical deformation associated with the fatigue crack propagation. The #4 cylinder had accumulated 76 hours of operation since new at the time of the rocker arm failure. No maintenance records were found for any repair, overhaul, or replacement of the rocker arm for the #4 cylinder. Total time on the engine was 3,198 hours. ## Factual narrative On October 9, 1999, at 1500 central daylight time, a Cessna 150G airplane, N3603J, sustained substantial damage during the forced landing following a loss of engine power near El Reno, Oklahoma. The airplane, owned by Timeless Images, Inc., of Edmond, Oklahoma, was operated by Sunshine Aviation, of Guthrie, Oklahoma, under 14 Code of Federal Regulations Part 91. The commercial pilot/flight instructor received minor injuries, and the student pilot was not injured. Visual meteorological conditions prevailed for the cross-country instructional flight, and a flight plan was not filed. The flight departed Guthrie, Oklahoma, at 1430, with a planned destination of Hobart, Oklahoma. Local authorities, the operator and the pilots reported to the FAA inspectors that a total loss of engine power occurred during cruise flight at 3,500 feet msl, approximately 6 miles west of the El Reno Municipal Airport. The flight diverted toward the airport; however, the airplane landed approximately 3 miles west of the El Reno Municipal Airport. During the landing flare/touchdown in the soft field, the nose landing gear collapsed and the aircraft spun around. The wings and empennage received structural damage. The nose landing gear and propeller were damaged. On October 20, 1999, the FAA inspector and the manufacturer representative examined the Continental O-200-A engine, serial number 64599-6-A. During the examination, the #4 cylinder intake rocker arm was found separated at the point where it attaches to the valve rocker shaft. The #4 cylinder components were forwarded to the NTSB Materials Laboratory for metallurgical examination. The metallurgical examination of the rocker arm indicated that a fatigue fracture initiated on the push rod side of the rocker arm. Optical and SEM examination of the surface of the rocker arm in the vicinity of the origin area revealed no evidence of machining defects or mechanical deformation associated with the origin. A portion of the contact surface of the valve side of the rocker arm had a smooth, metallic appearance, indicating off-center contact with the valve stem. See the enclosed metallurgist's report for additional details. The FAA inspector reported that a new #4 cylinder was installed on November 13, 1998. The FAA inspector reported the cylinder had been manufactured by [Aircraft] Engine Components, Inc., at San Antonio, Texas. This cylinder had accumulated 76 hours at the time of the rocker arm failure. There were no maintenance entries for repair, overhaul, or replacement of the rocker arm. Total time on the engine was 3,198 hours. See the enclosed maintenance records for additional information. The NTSB IIC examined the #4 cylinder components in March 2000 at Arlington, Texas. Vibro peened on the cylinder were the following numbers: head part number AEC65315D; casting number 67333-22; and PMA part number AEC65314-D FAA-PMA. According to personnel at Engine Components, Inc., the FAA Form 8130-3 with work order number 01118354 was for the #4 cylinder (part number AEC65314-A, serial number 67333-22H). ## Aircraft - Registration: [N3603J](https://openairdocs.org/deregistered/N3603J-2000-07-28), registration cancelled 2000-07-28, S/N 15064903 (OpenAirDocs) - Reported make and model: Cessna 150G - Registry model: [Cessna 150G](https://openairdocs.org/model/cessna-150g) (registry code 2071816) (OpenAirDocs) - Category: Airplane - Serial number: 15064903 - Airframe hours: 3198 - Engines: Continental O-200-A 100 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Sunshine Aviation - Registered owner: Timeless Images, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 24, 1999, 30 hours before - Departed: GOK, GUTHRIE, OK - Destination: HBR, HOBART, OK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 30; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 1,075 total, 150 in this make and model, 900 as pilot in command, 36 in the last 90 days, 22 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles ## 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 19991009028939A](https://openairdocs.org/incident/19991009028939A), Oct 9, 1999: Cessna 150G, El Reno, OK, Substantial damage. (.19) On October 9, 1999, at 1352 central daylight time, a Cessna 150G airplane, N3603J, sustained substantial damaged during the forced landing following a… ## Other investigations on N3603J (1) 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. - [NTSB FTW69F0336](https://openairdocs.org/ntsb/FTW69F0336), Nov 28, 1968: Cessna 150 (N3603J), Wynne, AR, substantial damage 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.