# NTSB GAA18CA275: Aeropro CZ S R O A240, N481B, Chandler, AZ, May 11, 2018 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 11, 2018, 08:00 local (15:00 UTC) - Place: Chandler, AZ - Coordinates: 33.269165, -111.811111 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.2692&lon=-111.8111&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Defining events: [Taxi: Ground collision](https://openairdocs.org/ntsb-events/200); [Taxi: Ground collision](https://openairdocs.org/ntsb-events/200) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report March 18, 2019 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA - NTSB case key (mKey): 97238 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA18CA275 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/97238/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=97238 - Page: https://openairdocs.org/ntsb/GAA18CA275 ## Probable cause (aircraft 2) The pilot’s failure to stop and yield to the airplane taxiing on the taxiway, which resulted in a ground collision. ## Probable cause (aircraft 1) The other pilot’s failure to stop and yield to the airplane taxiing on the taxiway, which resulted in a ground collision. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Attention/monitoring: task monitoring/vigilance](https://openairdocs.org/ntsb-findings/02021520): Personnel issues › Psychological · Pilot of other aircraft (probable cause), aircraft 1; cases with it: [Aeropro CZ S R O A240, 1 case](https://openairdocs.org/ntsb-findings/02021520/cases.md?model=060006U), [All aircraft, 330 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md) - [Object/animal/substance: aircraft](https://openairdocs.org/ntsb-findings/03022040): Environmental issues › Physical environment · Effect on operation (probable cause), aircraft 1; cases with it: [Aeropro CZ S R O A240, 1 case](https://openairdocs.org/ntsb-findings/03022040/cases.md?model=060006U), [All aircraft, 116 cases](https://openairdocs.org/ntsb-findings/03022040/cases.md) - [Attention/monitoring: task monitoring/vigilance](https://openairdocs.org/ntsb-findings/02021520): Personnel issues › Psychological · Pilot (probable cause), aircraft 2; cases with it: [Piper PA-28-161, 3 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md?model=7102803), [All aircraft, 330 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md) - [Object/animal/substance: aircraft](https://openairdocs.org/ntsb-findings/03022040): Environmental issues › Physical environment · Effect on operation (probable cause), aircraft 2; cases with it: [Piper PA-28-161, 3 cases](https://openairdocs.org/ntsb-findings/03022040/cases.md?model=7102803), [All aircraft, 116 cases](https://openairdocs.org/ntsb-findings/03022040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Taxi: Miscellaneous/other](https://openairdocs.org/ntsb-events/900), aircraft 1; cases with it: [Aeropro CZ S R O A240, 2 cases](https://openairdocs.org/ntsb-events/900/sequence.md?model=060006U), [All aircraft, 1,556 cases](https://openairdocs.org/ntsb-events/900/sequence.md) - [Taxi: Ground collision](https://openairdocs.org/ntsb-events/200) (defining event), aircraft 1; cases with it: [Aeropro CZ S R O A240, 1 case](https://openairdocs.org/ntsb-events/200/sequence.md?model=060006U), [All aircraft, 618 cases](https://openairdocs.org/ntsb-events/200/sequence.md) - [Taxi: Miscellaneous/other](https://openairdocs.org/ntsb-events/900), aircraft 2; cases with it: [Piper PA-28-161, 7 cases](https://openairdocs.org/ntsb-events/900/sequence.md?model=7102803), [All aircraft, 1,556 cases](https://openairdocs.org/ntsb-events/900/sequence.md) - [Taxi: Ground collision](https://openairdocs.org/ntsb-events/200) (defining event), aircraft 2; cases with it: [Piper PA-28-161, 13 cases](https://openairdocs.org/ntsb-events/200/sequence.md?model=7102803), [All aircraft, 618 cases](https://openairdocs.org/ntsb-events/200/sequence.md) ## Analysis (aircraft 2) According to the pilot in the low-wing airplane, he was cleared by ground control to taxi to runway 22R via "Alpha and November." Taxiway Alpha runs parallel to runway 22R. The pilot approached taxiway Alpha via taxiway Mike, and before entering the intersection of taxiways Alpha and Mike, he "looked in all directions for aircraft" and then proceeded to turn left onto taxiway Alpha without stopping. His airplane's right wing collided with the left side of another airplane already taxiing via Alpha to 22R. He asserted that the other airplane was moving very fast when the collision occurred. His airplane sustained substantial damage to the right aileron. According to the student pilot in the high-wing airplane, he received clearance from ground control to taxi to runway 22R via "Alpha and November." He recalled that he was established on Alpha and heading toward 22R with his landing lights on. He saw the low-wing airplane approaching the intersection of taxiway Alpha and Mike from the nonmovement area. He reported that the low-wing airplane turned left onto taxiway Alpha without stopping. The low-wing airplane's right wing collided with the left side of his airplane. His airplane sustained damage to the left-wing lift strut, the left-wing support struts, and the windscreen. Both pilots reported that there were no preaccident mechanical malfunctions or failures with their airplanes that would have precluded normal operation. ## Analysis (aircraft 1) According to the pilot in the low-wing airplane, he was cleared by ground control to taxi to runway 22R via "Alpha and November." Taxiway Alpha runs parallel to runway 22R. The pilot approached taxiway Alpha via taxiway Mike, and before entering the intersection of taxiways Alpha and Mike, he "looked in all directions for aircraft" and then proceeded to turn left onto taxiway Alpha without stopping. His airplane's right wing collided with the left side of another airplane already taxiing via Alpha to 22R. He asserted that the other airplane was moving very fast when the collision occurred. His airplane sustained substantial damage to the right aileron. According to the student pilot in the high-wing airplane, he received clearance from ground control to taxi to runway 22R via "Alpha and November." He recalled that he was established on Alpha and heading toward 22R with his landing lights on. He saw the low-wing airplane approaching the intersection of taxiway Alpha and Mike from the nonmovement area. He reported that the low-wing airplane turned left onto taxiway Alpha without stopping. The low-wing airplane's right wing collided with the left side of his airplane. His airplane sustained damage to the left-wing lift strut, the left-wing support struts, and the windscreen. Both pilots reported that there were no preaccident mechanical malfunctions or failures with their airplanes that would have precluded normal operation. ## Factual narrative (aircraft 2) According to the pilot in the low-wing airplane, he was cleared by ground control to taxi to runway 22R via "Alpha and November." Taxiway Alpha runs parallel to runway 22R. The pilot approached taxiway Alpha via taxiway Mike, and before entering the intersection of taxiways Alpha and Mike, he "looked in all directions for aircraft" and then proceeded to make a left turn onto taxiway Alpha without stopping. His airplane's right wing collided with the left side of another airplane already taxing via Alpha to 22R. He asserted that the other airplane was moving very fast when the collision occurred. His airplane sustained substantial damage to the right aileron. According to the student pilot in the high wing airplane, he received clearance from ground control to taxi to runway 22R via "Alpha and November." He recalled that he was established on Alpha and heading toward 22R with his landing lights on. He saw the low wing airplane approaching the intersection of taxiway Alpha and Mike from the non-movement area. He reported that the low-wing airplane made a left turn onto taxiway Alpha without stopping. The low-wing airplane's right wing collided with the left side of his airplane. His airplane sustained damage to the left-wing lift strut, the left wing support struts, and the windscreen. Both pilots reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Factual narrative (aircraft 1) According to the pilot in the low-wing airplane, he was cleared by ground control to taxi to runway 22R via "Alpha and November." Taxiway Alpha runs parallel to runway 22R. The pilot approached taxiway Alpha via taxiway Mike, and before entering the intersection of taxiways Alpha and Mike, he "looked in all directions for aircraft" and then proceeded to make a left turn onto taxiway Alpha without stopping. His airplane's right wing collided with the left side of another airplane already taxing via Alpha to 22R. He asserted that the other airplane was moving very fast when the collision occurred. His airplane sustained substantial damage to the right aileron. According to the student pilot in the high wing airplane, he received clearance from ground control to taxi to runway 22R via "Alpha and November." He recalled that he was established on Alpha and heading toward 22R with his landing lights on. He saw the low wing airplane approaching the intersection of taxiway Alpha and Mike from the non-movement area. He reported that the low-wing airplane made a left turn onto taxiway Alpha without stopping. The low-wing airplane's right wing collided with the left side of his airplane. His airplane sustained damage to the left-wing lift strut, the left wing support struts, and the windscreen. Both pilots reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Aircraft 1 - Registration: [N481B](https://openairdocs.org/aircraft/N481B), registered now, S/N 47816, built 2016 (OpenAirDocs) - Reported make and model: AEROPRO CZ S R O A240 - Registry model: [Aeropro CZ S R O A240](https://openairdocs.org/model/aeropro-cz-s-r-o-a240) (registry code 060006U) (OpenAirDocs) - Registry engine: [Rotax 912ULS series](https://openairdocs.org/engine/rotax-912uls-series) (registry code 55572, 4 cycle) (OpenAirDocs) - Category: Airplane - Serial number: 47816 - Year built: 2016 - Airframe hours: 232 - Engines: ROTAX 912ULS 100 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Airworthiness certificate: Special, Special light-sport (Special) - Last inspection: Annual, June 15, 2015 - Departed: CHD, Chandler, AZ - Destination: CHD, Chandler, AZ - Airport: CHD, Chandler Muni - Equipment: Electronic multifunction display ## Aircraft 2 - Registration: [N4121T](https://openairdocs.org/aircraft/N4121T), registered now, S/N 2842017, built 1996 (OpenAirDocs) - Reported make and model: PIPER PA 28 (161) - Registry model: [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161) (registry code 7102803) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2842017 - Year built: 1996 - Airframe hours: 14672 - Engines: LYCOMING O-320-D3G 160 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Chandler Air Service Inc. - Registered owner: Chandler Air Service Inc. - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, March 14, 2018 - Departed: CHD, Chandler, AZ - Destination: E60, Eloy, AZ - Airport: CHD, Chandler Muni - Equipment: Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot, aircraft N481B; age 62; injuries: none; student; medical: sport pilot, with waivers/limitations; seat: left; restraint: 4-point; flight hours: 45 total, 45 in this make and model, 24 as pilot in command, 26 in the last 90 days - Pilot, aircraft N4121T; age 46; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review April 13, 2017; seat: left; restraint: 3-point; flight hours: 68 total, 14 in this make and model, 27 as pilot in command, 14 in the last 90 days, 14 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 160° at 6 knots - Visibility: 10 statute miles - Temperature: 82 °F, dew point 32 °F - Altimeter: 29.76 inHg - Observed at: KCHD ## Docket (8 files) The files NTSB released with the investigation on November 21, 2018, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=97238. 11.0 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 -N4121T (item 1, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468498&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1%20-N4121T-Master.PDF - N4121T Initial Narrative (item 2, .PDF, 43 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468499&FileExtension=.PDF&FileName=N4121T%20Initial%20Narrative-Master.PDF - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 -N481B (item 3, .PDF, 4.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468502&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1%20-N481B-Master.PDF - 6120_1 Complete Narrative -N481B (item 4, .PDF, 153 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468501&FileExtension=.PDF&FileName=6120_1%20Complete%20Narrative%20-N481B-Master.PDF - N481B Initial Narrative (item 5, .PDF, 621 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468503&FileExtension=.PDF&FileName=N481B%20Initial%20Narrative-Master.PDF - Airport Diagram (item 6, .PDF, 122 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468504&FileExtension=.PDF&FileName=Airport%20Diagram-Master.PDF - ATC Ground Clearance Recording (item 7, WAV, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468505&FileExtension=wav&FileName=ATC%20Ground%20Clearance%20Recording%20-Master - Photos (item 8, .PDF, 584 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40468506&FileExtension=.PDF&FileName=Photos-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.