# NTSB CHI99IA144: Cessna 206H, N42122, Wheeling, IL, April 26, 1999 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: April 26, 1999, 09:30 local (14:30 UTC) - Place: Wheeling, IL - Coordinates: 42.130645, -87.920455 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.1306&lon=-87.9205&mi=10 - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report August 14, 2001 - Report: Approved by Office Director - ADs cited in the narratives: [AD 99-13-04](https://openairdocs.org/ad/99-13-04) (OpenAirDocs) - NTSB case key (mKey): 46221 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI99IA144 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46221/pdf - Page: https://openairdocs.org/ntsb/CHI99IA144 ## Probable cause improper installation of the aileron control bellcrank stop bolts and lock nuts during the manufacturing process which resulted in a binding aileron control surface. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, standing - engine(s) operating - flt control syst,aileron control - binding(mechanical) (cause) - maintenance,installation - improper, manufacturer (cause) ## Analysis During the run-up flight control checks prior to takeoff, the pilot experienced an aileron control failure. He was unable to obtain left aileron up movement. Inspection determined that the aileron had 4 degrees of up travel. Normal travel was 20 degrees +/- 2 degrees. Further inspection revealed that one of the aileron control bellcrank stop bolt/jam nut assemblies was loose allowing the stop bolt to rotate out of the threaded boss. This restricted the aileron movement. The three other stop bolt/jam nut assemblies were also inspected and were found to be loose. The airplane was a 1999 model, s/n 25, which had a total of approximately 11 hours on it at the time of the incident. In response to this incident Cessna Aircraft Company issued Special Service Project SSP99-27-02. On June 21, 1999, the Federal Aviation Administration issued Airworthiness Directive, 99-13-04, effective July 13, 1999. The AD requires '...inspecting the left and right wing aileron control bellcrank stop bolts and lock nuts for flush and tight contact with the surface of the threaded boss on each end of the yoke assemblies, and accomplishing follow-on and corrective actions, as applicable.' ## Factual narrative On April 26, 1999, at 0930 central daylight time, a Cessna 206H, N42122, registered to Palwaukee Aviation, experienced an aileron control failure during the run-up flight control checks prior to takeoff. The incident occurred at the Palwaukee Airport, Wheeling, Illinois. The airplane was not damaged. The pilot and passenger were not injured. The 14 CFR Part 91 positioning flight was operating in visual meteorological conditions and no flight plan was filed. The planned destination was Naperville, Illinois. The pilot reported that he was unable to obtain left aileron up movement. He taxied the airplane to a maintenance facility where it was determined that the aileron had 4 degrees of up travel. Normal travel is 20 degrees +/- 2 degrees. Further inspection revealed that one of the aileron control bellcrank stop bolt/jam nut assemblies was loose allowing the stop bolt to rotate out of the threaded boss. This restricted the aileron movement. The three other stop bolt/jam nut assemblies were also inspected and were found to be loose. The airplane is a 1999 model, s/n 25, which had a total of approximately 11 hours on it at the time of the incident. In response to this incident Cessna Aircraft Company contacted all Cessna 206H and T206H owners/operators and informed them of this occurrence. Cessna Aircraft Company then issued Special Service Project SSP99-27-02. On June 21, 1999, the Federal Aviation Administration issued Airworthiness Directive, 99-13-04, effective July 13, 1999. The AD requires "...inspecting the left and right wing aileron control bellcrank stop bolts and lock nuts for flush and tight contact with the surface of the threaded boss on each end of the yoke assemblies, and accomplishing follow-on and corrective actions, as applicable." ## Aircraft - Registration: N42122 (not matched to a registry record) - Reported make and model: Cessna 206H - Category: Airplane - Serial number: 25 - Airframe hours: 11 - Engines: Lycoming IO-540 300 horsepower reciprocating - Damage: No damage - Flight: Positioning, Part 91 - Registered owner: Palwaukee Aviation - Airworthiness certificate: Standard, Normal - Destination: LL10, NAPERVILLE, IL - Airport: PWK, Palwaukee ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 42; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 1,596 total, 14 in this make and model, 1,424 as pilot in command, 168 in the last 90 days, 44 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Dawn - Wind: 60° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 57 °F - Altimeter: 29.00 inHg - Observed at: PWK 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.