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FAASTeam Notice
Type: Helicopter Operations
Notice Date: Friday, March 10, 2023
Notice Number: NOTC2901
USHST Monthly Safety Report for March 2023
This notice expired on
Tuesday, October 10, 2023

US Helicopter Safety Team (USHST)

Monthly Safety Report

March 2023


Fatal Accident Rate:  0.75 (+.20) above goal of 0.55 fatal accidents per 100K hrs by 2025

USHST VisionA Civil Helicopter Community with Zero Fatal Accidents


“Safety by the Numbers” (Monthly Metrics):

Days since last Fatal helicopter accident:  70 Days : 01 Hours : 09 Minutes : 56 Seconds

Fatal Accident Rate (5yr avg)(CY2019-23) 0.75 Fatal Accidents per 100K Flight Hours

Fatal Accident Rate (CY2023) 0 Fatal Accidents per 100K Flight Hours


Average number of days

between fatal accidents:

Longest time between

fatal accidents (past 5 yrs):                

2018: 14 days

107 days (2020)

2019: 16 days


2020: 18 days


2021: 17 days


2022: 21 days




Loss of Control-Inflight (LOC-I), Unintended Flight into IMC (UIMC), Low Altitude Operations (LALT). 

USHST continues to work on the implementation of 16 Helicopter - Safety Enhancements (H-SE) developed through data-driven analysis of 104 fatal accidents.  The H-SE’s use Outreach, Policy, Technology/Equipment, and Training to reduce fatal accidents in these categories.


H-SE 81:  Simulators and Outside-the Envelope Flight Conditions

Provide recommendations for mathematical/physics-based models for helicopter flight dynamics to achieve more realistic, higher-fidelity simulations of outside-the-envelope flight conditions. Current models are not accurate at edge-of-the-envelope and outside-of-the-envelope flight regimes. This may lead to unrealistic training of maneuvers such as loss of tail rotor effectiveness, vortex ring state/settling with power, and autorotations and a negative transfer of training when similar situations are encountered during actual flight.

1. FAA, industry, and academia to review existing helicopter simulator/physics-based models and conduct research/testing to develop recommendations regarding improved helicopter mathematical/physics-based models.

2. FAA AFS-200/AFS-800 to update advisory circulars AC120-45A and AC-61-136A (or create helicopter-specific variants) based on recommendations to facilitate use of improved fidelity helicopter flight dynamics models in helicopter simulators.

3. USHST Outreach Team to conduct outreach to simulator and flight training device manufacturers regarding recommendations for higher-fidelity mathematical models.

Improve Simulator Modeling for Outside-the-Envelope Flight Conditions: Output Report


US Helicopter Safety Team Press Release (Mar ‘23): USHST names Chris Baur as its next industry Co-Chair


  Helicopter Safety OUTREACH events:

· Next USHST All Hands Webinar – TBD                          Previous All Hands - November 14, 2022

· ROTOR Helicopter Association International - Upcoming Events

· Helicopter Safety Alliance - Upcoming Events



USHST Facebook (2566 Members)                          USHST LinkedIn               USHST Twitter

For any questions regarding the information within this notice please contact Clarke Pleasants, Program Chair-Rotor, ERAU, at 928-7774730 or email at