# NTSB FTW99LA244: Cessna A188B, N731JY, Seminole, TX, August 30, 1999 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: August 30, 1999, 18:45 local (23:45 UTC) - Place: Seminole, TX - Coordinates: 32.709312, -102.64965 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.7093&lon=-102.6496&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report November 2, 2000 - Report: Approved by Office Director - ADs cited in the narratives: [AD 87-20-03 R2](https://openairdocs.org/ad/87-20-03-R2) (OpenAirDocs) - NTSB case key (mKey): 47203 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW99LA244 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47203/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=47203 - Page: https://openairdocs.org/ntsb/FTW99LA244 ## Probable cause The pilot seat disengaging from the seat track resulting from inadequate AD compliance during the last annual inspection. 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 control - on ground/water, landing - roll - fuselage,seat - disengaged (cause) - maintenance,compliance with ad - inadequate, other maintenance personnel (cause) - On ground/water encounter with terrain/water, landing - roll - terrain condition - soft (contributing factor) - Nose over, landing - roll ## Analysis During the landing roll, the agricultural airplane departed the right side of the runway, rolled into soft terrain, and subsequently nosed over to the inverted position. The pilot reported that during the landing roll, his seat became dislodged from the seat track. He further reported that since his left leg is shorter than his right leg, when the seat slid all the way back, it caused his left foot to lose contact with the rudder pedal. Examination of the seat by an FAA inspector revealed that the forward left seat roller housing assembly had spread open to near the width of the seat rail, allowing the seat to dislodge from the locked position. According to the inspector, the airplane's maintenance records indicated that AD 87-20-03 R2 (to assure proper engagement of the seat locking mechanism and to preclude inadvertent seat slippage) had been complied with at the last annual inspection. However, the inspector stated that the AD had not been properly accomplished, since his examination of the seat revealed that it did not meet the locking pin engagement requirements of the AD. Time since the last annual inspection was 249.4 hours. ## Factual narrative On August 30, 1999, at 1845 central daylight time, a Cessna A188B agricultural airplane, N731JY, nosed over during landing at a private airstrip near Seminole, Texas. The aircraft was owned and operated by Addison Flying Service, Seminole, Texas, under 14 Code of Federal Regulations Part 137. The commercial pilot received serious injuries, and the aircraft sustained substantial damage. Visual meteorological conditions prevailed for the flight, and a flight plan was not filed. The flight originated from Kilgore, Texas, with a landing at the Seminole/Gaines County Municipal Airport. The flight then departed this municipal airport for a positioning flight to the nearby private airstrip at 1830. During a telephone interview, conducted by the NTSB investgator-in-charge (IIC), the operator reported that the aircraft was landing to the east on his private caliche (gravel) runway (5,280 feet long and 60 feet wide). The airplane departed the right side of the runway into soft dirt and "flipped" to the inverted position. The vertical stabilizer and rudder were crushed. The cockpit was compressed and the wings were wrinkled. On the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) the pilot stated that "after initial touchdown the pilot seat slid back all the way which made it impossible to reach the left rudder pedal." The pilot further stated that his left leg is shorter than his right leg. The FAA inspector, who responded to the site, found that the pilot seat was dislodged from the seat track. Further examination revealed that the "part number 0700645-1 housing assembly seat roller forward left had spread open to near the width of the seat rail allowing the seat to dislodge from the locked position." The FAA inspector reported that the "airworthiness directive 87-20-03 had not been properly accomplished on the seat installation in N731JY. The seat did not meet the locking pin engagement requirements of the airworthiness directive. The airworthiness directive had been properly signed off in the maintenance records during the last inspection." The aircraft tachometer reading was 249.4 hours. A review of the maintenance records by the NTSB investigator-in-charge revealed that the last annual inspection was performed on April 16, 1999, at a total aircraft time of 5,039 hours, and the tachometer was replaced at that time. ## Aircraft - Registration: [N731JY](https://openairdocs.org/deregistered/N731JY-2000-06-26), registration cancelled 2000-06-26, S/N 18802941T (OpenAirDocs) - Reported make and model: Cessna A188B - Registry model: [Cessna A188B](https://openairdocs.org/model/cessna-a188b) (registry code 2073005) (OpenAirDocs) - Category: Airplane - Serial number: 18802941T - Airframe hours: 5288 - Engines: Continental IO-520-D 285 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Graham Addison, doing business as Addison Flying Service, Inc - Registered owner: John Wesley Addison - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, April 16, 1999, 249 hours before - Departed: 4TX6, TX - Destination: 5TAO - Airport: 5TAO, Hamilton Aircraft, Inc., runway 9, 5,280 × 60 ft, gravel ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 4,200 total, 400 in this make and model, 4,100 as pilot in command, 200 in the last 90 days, 80 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 120° at 12 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 93 °F, dew point 46 °F - Altimeter: 30.00 inHg - Observed at: HOB, 31 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 19990830047159A](https://openairdocs.org/incident/19990830047159A), Aug 30, 1999: Cessna A188B, Seminole, TX, Substantial damage. (.4)During the landing roll, the agricultural airplane departed the right side of the runway, rolled into soft terrain, and subsequently nosed over to the… ## Docket (12 files) The files NTSB released with the investigation on March 3, 2000, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=47203. 5.3 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 2.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40423626&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Reports from Federal Agencies - FAA (item 2, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40423627&FileExtension=.PDF&FileName=Reports%20from%20Federal%20Agencies%20-%20FAA-Redacted.PDF - Aircraft Records (item 3, .PDF, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40423628&FileExtension=.PDF&FileName=Aircraft%20Records-Redacted.PDF - Airworthiness Directives (item 4, .PDF, 486 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119228&FileExtension=.PDF&FileName=Airworthiness%20Directives-Master.PDF - Photo 1: View of landing strip shows where N731J left the dtrip to the right. (No Neg, Courtesy FAA) (item 5, .PDF, 33 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119229&FileExtension=.PDF&FileName=Photo%201%3A%20%20View%20of%20landing%20strip%20shows%20where%20N731J%20left%20the%20dtrip%20to%20the%20right.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 2: Left view of N731J. (No Neg, Courtesy FAA) (item 6, .PDF, 38 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119230&FileExtension=.PDF&FileName=Photo%202%3A%20%20Left%20view%20of%20N731J.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 3: View of seat bottom and attach points. (No Neg, Courtesy FAA) (item 7, .PDF, 41 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119231&FileExtension=.PDF&FileName=Photo%203%3A%20%20View%20of%20seat%20bottom%20and%20attach%20points.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 4: View of left front seat attach point. Measurement is 15/32. (No Neg, Courtesy FAA) (item 8, .PDF, 37 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119232&FileExtension=.PDF&FileName=Photo%204%3A%20%20View%20of%20left%20front%20seat%20attach%20point.%20%20Measurement%20is%2015%2F32.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 5: View of left rear seat attach point. Measurement is 9/32. (No Neg, Courtesy FAA) (item 9, .PDF, 37 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119233&FileExtension=.PDF&FileName=Photo%205%3A%20%20View%20of%20left%20rear%20seat%20attach%20point.%20%20Measurement%20is%209%2F32.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 6: Right rear seat attach point. Measurement is 9/32. (No Neg, Courtesy FAA) (item 10, .PDF, 34 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119234&FileExtension=.PDF&FileName=Photo%206%3A%20%20Right%20rear%20seat%20attach%20point.%20%20Measurement%20is%209%2F32.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 7: Left front seat leg with locking pin released. (No Neg, Courtesy FAA) (item 11, .PDF, 32 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119235&FileExtension=.PDF&FileName=Photo%207%3A%20%20Left%20front%20seat%20leg%20with%20locking%20pin%20released.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF - Photo 8: Recording Tachometer N731JY. (No Neg, Courtesy FAA) (item 12, .PDF, 30 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40119236&FileExtension=.PDF&FileName=Photo%208%3A%20%20Recording%20Tachometer%20N731JY.%20%20(No%20Neg,%20Courtesy%20FAA)-Master.PDF 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.