# Indep instrument (clock, etc) - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Indicating/recording systems](https://openairdocs.org/ntsb-findings/010231) › Indep instrument (clock, etc) - NTSB code: 01023120 - Cases: 6 - In the probable cause: 5 - Fatal cases: 1 - All cases: https://openairdocs.org/ntsb-findings/01023120/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01023120/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01023120 ## Cases per year (in the probable cause / all) - 2009: 0 / 1 - 2010: 2 / 2 - 2014: 1 / 1 - 2016: 1 / 1 - 2017: 1 / 1 ## Defining events in these cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases - [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 1 cases - [Flight instrument malf/fail](https://openairdocs.org/ntsb-events/334): 1 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 1 cases - [Runway excursion](https://openairdocs.org/ntsb-events/300): 1 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 1 cases ## Aircraft models (registry) - [Robinson Helicopter R44 II](https://openairdocs.org/model/robinson-helicopter-r44-ii): 1 cases - [Piper PA-32R-301](https://openairdocs.org/model/piper-pa-32r-301): 1 cases - [Cessna 402C](https://openairdocs.org/model/cessna-402c): 1 cases - [Cessna 172L](https://openairdocs.org/model/cessna-172l): 1 cases - [Beech V35](https://openairdocs.org/model/beech-v35): 1 cases - [Hoffius Stowe CHALLENGER II](https://openairdocs.org/model/hoffius-stowe-challenger-ii): 1 cases ## Other findings in the same cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 3 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases - [Conducive to structural icing](https://openairdocs.org/ntsb-findings/03031025) (Environmental issues): 1 cases - [High density altitude](https://openairdocs.org/ntsb-findings/03031020) (Environmental issues): 1 cases - [Snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015) (Environmental issues): 1 cases - [Tree(s)](https://openairdocs.org/ntsb-findings/03022020) (Environmental issues): 1 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases - [Use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032) (Personnel issues): 1 cases - [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 1 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases ## Newest cases - [NTSB ERA17LA163](https://openairdocs.org/ntsb/ERA17LA163), Apr 20, 2017: Robinson R44 (N899GB), Orlando, FL, substantial damage. Probable cause: A partial failure of the helicopter's engine tachometer due to the separation of one of the magnet assemblies and engine roughness, which precipitated the pilot’s initiation of an off-airport… - [NTSB CEN16LA186](https://openairdocs.org/ntsb/CEN16LA186), May 15, 2016: Piper PA 32R (N185DX), Alpine, TX, substantial damage. Probable cause: The engine’s decreased performance due to high-density altitude conditions and a partially obstructed fuel injector nozzle. Contributing to the pilot's decision to perform an off-field landing was… - [NTSB CEN14LA243](https://openairdocs.org/ntsb/CEN14LA243), May 10, 2014: Hoffius Stowe Challenger II (N824SH), Attica, IN, substantial damage, 1 fatal. Probable cause: The pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle-of-attack while maneuvering at low altitude, which led to an aerodynamic stall and loss of… - [NTSB ERA11LA105](https://openairdocs.org/ntsb/ERA11LA105), Dec 31, 2010: Cessna 172 (N4383Q), Dublin, NC, substantial damage. Probable cause: The pilot’s improper touchdown speed which resulted in a runway overrun. Contributing to the accident was the undetermined malfunction of the airspeed indicator. - [NTSB ERA10LA128](https://openairdocs.org/ntsb/ERA10LA128), Feb 1, 2010: Cessna 402C (N121PB), Watertown, NY, substantial damage. Probable cause: The pilot's decision to continue the approach with a known anomaly with the left airspeed indicator. Contributing to the accident was an undetermined malfunction of the left airspeed indicator and… - [NTSB CEN10LA068](https://openairdocs.org/ntsb/CEN10LA068), Dec 6, 2009: Beech V35 (N108L), Dodge City, KS, substantial damage. Probable cause: The failure of the pitot heat system in icing conditions resulting in an inoperative airspeed indicator which led to an inadvertant stall while on final approach. Contributing to the accident was the… 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.