# Performance calculations - Type: NTSB finding subsection - Path: [Personnel issues](https://openairdocs.org/ntsb-findings/02) › [Task performance](https://openairdocs.org/ntsb-findings/0206) › [Planning/preparation](https://openairdocs.org/ntsb-findings/020610) › Performance calculations - NTSB code: 02061010 - Cases: 115 - In the probable cause: 108 - Fatal cases: 17 - All cases: https://openairdocs.org/ntsb-findings/02061010/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/02061010/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/02061010 ## Cases per year (in the probable cause / all) - 2008: 9 / 9 - 2009: 3 / 3 - 2010: 5 / 6 - 2011: 9 / 9 - 2012: 10 / 10 - 2013: 8 / 8 - 2014: 4 / 5 - 2015: 6 / 6 - 2016: 6 / 7 - 2017: 6 / 6 - 2018: 4 / 4 - 2019: 6 / 6 - 2020: 8 / 8 - 2021: 8 / 8 - 2022: 1 / 2 - 2023: 10 / 10 - 2024: 2 / 3 - 2025: 3 / 4 - 2026: 0 / 1 ## Defining events in these cases - [Collision during takeoff/land](https://openairdocs.org/ntsb-events/490): 27 cases - [Runway excursion](https://openairdocs.org/ntsb-events/300): 19 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 18 cases - [Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241): 10 cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 8 cases - [Loss of lift](https://openairdocs.org/ntsb-events/500): 7 cases - [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 3 cases - [Low altitude operation/event](https://openairdocs.org/ntsb-events/220): 3 cases - [Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120): 3 cases - [External load event (Rotorcraft)](https://openairdocs.org/ntsb-events/480): 2 cases ## Aircraft models (registry) - [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 8 cases - [Robinson Helicopter R44 II](https://openairdocs.org/model/robinson-helicopter-r44-ii): 3 cases - [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 3 cases - [Cessna 172N](https://openairdocs.org/model/cessna-172n): 3 cases - [Air Tractor AT-502B](https://openairdocs.org/model/air-tractor-at-502b): 3 cases - [Robinson Helicopter R22 BETA](https://openairdocs.org/model/robinson-helicopter-r22-beta): 2 cases - [Piper PA-32R-300](https://openairdocs.org/model/piper-pa-32r-300): 2 cases - [Piper PA-28R-201](https://openairdocs.org/model/piper-pa-28r-201): 2 cases - [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b): 2 cases - [Diamond Aircraft Ind DA20-C1](https://openairdocs.org/model/diamond-aircraft-ind-da20-c1): 2 cases ## Other findings in the same cases - [High density altitude](https://openairdocs.org/ntsb-findings/03031020) (Environmental issues): 43 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 37 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 24 cases - [Climb rate](https://openairdocs.org/ntsb-findings/01062035) (Aircraft): 19 cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 19 cases - [Takeoff distance](https://openairdocs.org/ntsb-findings/01061025) (Aircraft): 16 cases - [Climb capability](https://openairdocs.org/ntsb-findings/01061010) (Aircraft): 16 cases - [Weight/balance calculations](https://openairdocs.org/ntsb-findings/02061015) (Personnel issues): 15 cases - [Maximum weight](https://openairdocs.org/ntsb-findings/01061035) (Aircraft): 13 cases - [Tree(s)](https://openairdocs.org/ntsb-findings/03022020) (Environmental issues): 12 cases ## Newest cases - [NTSB WPR26LA267](https://openairdocs.org/ntsb/WPR26LA267), Jul 18, 2026: Rans S7 (N6133M), Kemmerer, WY, substantial damage. Probable cause: The pilot’s decision to perform a take-off in high-density-altitude, gusting-crosswind conditions, which resulted in an aerodynamic stall, hard landing and subsequent nose-over. - [NTSB WPR25LA308](https://openairdocs.org/ntsb/WPR25LA308), Sep 11, 2025: Thomas Graham Teenie Two (N311TS), Chehalis, WA, substantial damage. Probable cause: The pilot's improper decision to take off with the airplane over its maximum allowable gross weight, which degraded its climb performance and led to a subsequent off airport landing. - [NTSB ANC25LA095](https://openairdocs.org/ntsb/ANC25LA095), Aug 21, 2025: Helio H-395 (N44344), Pilot Point, AK, substantial damage. Probable cause: The pilot's inadequate takeoff performance planning, which resulted in a runway excursion and collision with terrain. - [NTSB CEN25LA231](https://openairdocs.org/ntsb/CEN25LA231), Jul 1, 2025: Grumman Acft ENG Cor-Schweizer G-164B (N8834H), Lockport, LA, substantial damage. Probable cause: The pilot’s inadequate planning for the high density altitude conditions which resulted in reduced airplane performance, climb capability, and subsequent forced landing. - [NTSB ERA25LA212](https://openairdocs.org/ntsb/ERA25LA212), May 25, 2025: Air Tractor AT-602 (N260LA), Fremont, OH, substantial damage. Probable cause: The pilot’s inadequate takeoff performance planning, which resulted in a runway overrun and collision with terrain. - [NTSB WPR25LA034](https://openairdocs.org/ntsb/WPR25LA034), Nov 7, 2024: Robinson Helicopter R44 II (N4361R), Durkee, OR, substantial damage. Probable cause: The pilot's inadequate performance planning, which resulted in insufficient engine power to transition into an out-of-ground-effect hover at a high gross weight. - [NTSB ANC24LA098](https://openairdocs.org/ntsb/ANC24LA098), Sep 15, 2024: Piper PA-18-150 (N4242Z), Fairbanks, AK, substantial damage. Probable cause: The pilot’s failure to maintain a rate of climb sufficient to clear obstacles during takeoff, resulting in a collision with obstacles and a subsequent aerodynamic stall. - [NTSB ERA24LA197](https://openairdocs.org/ntsb/ERA24LA197), Apr 27, 2024: Beech F35 (N3880B), McAlpin, FL, destroyed. Probable cause: The pilot’s inadequate preflight planning and failure to abort the takeoff at the predetermined decision point. - [NTSB OPS24LA011](https://openairdocs.org/ntsb/OPS24LA011), Dec 9, 2023: Diamond Aircraft Ind DA20-C1 (N857PA), North Las Vegas, NV, incident, no damage. Probable cause: The local controller’s loss of situational awareness, inadequate provision of traffic advisory or safety alert information, and lack of positive control, that resulted in a near-midair collision. - [NTSB WPR24FA035](https://openairdocs.org/ntsb/WPR24FA035), Nov 14, 2023: Cessna 172G (N3971L), Provo, UT, substantial damage, 2 fatal. Probable cause: The pilot's exceedance of the airplane's critical angle of attack during a chandelle maneuver, which resulted in an aerodynamic stall and descent into trees and terrain. Contributing to the accident… NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted. Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1). NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names. --- 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.