NTSB GAA21WA078 — 2021-04-18 · Toluca de Lerdo, Mexico

Aircraft involved

XB-PIZ Learjet 25 None

Probable cause & factual narrative

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Related research

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Embry-Riddle Scholarly Commons 2026 · Journal article (IJAAA) Designated Pilot Examiner System Study - 2025

In recent years primary flight training in the United States has experienced a significant bottleneck in the form of long waits to schedule check rides with Designated Pilot Examiners.
Semantic Scholar 2023 · Article (EClinicalMedicine) Efficacy and tolerability of an endogenous metabolic modulator (AXA1125) in fatigue-predominant long COVID: a single-centre, double-blind, randomised controlled phase 2a pilot study

Summary Background ‘Long COVID’ describes persistent symptoms, commonly fatigue, lasting beyond 12 weeks following SARS-CoV-2 infection.
NTSB Safety Studies 2019 · Safety study Bell 525 Relentless In-Flight Breakup

Investigation report and safety study on the 6 July 2016 in-flight breakup of a Bell 525 Relentless helicopter prototype during a developmental flight test near Italy, Texas.
NTSB Aircraft Accident Reports 2019 · Accident report In-Flight Breakup of Bell 525 Relentless Helicopter

Bell 525 prototype helicopter in-flight breakup near Italy, TX, July 6, 2016 — 2 fatalities. Investigation of the developmental-flight-test in-flight breakup of a Bell 525 Relentless prototype.
NASA NTRS 2019 · Contractor Report (CR) Investigation Into The Needs of Part 135 Operators to Access Airports Restricted Under FAR Part 135 Sections 135.213, 135.219 and/or 135.225

NASA and the FAA have joint interests and responsibilities for developing guidelines and standards for cockpit displays of Flight Information Services (FIS) information and for developing enhancements…
NASA NTRS 2019 · Contractor Report (CR) An Investigation Into Criteria Commonly Used by the FAA to Grant Relief to Part 135 Operators Under FAR Sections: 135.213, 135.219, and/or 135.225

The objective of this study was to determine the criteria commonly used by the FAA to grant waivers, exemptions, or deviations to FAR Part 135, Sections 135.213, 135.219, and 135.225 and the potential…