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HELIO HST-550

1 registered · 1964–1964 · 0 NTSB events · 5 ADs

About this data

Fixed Wing Single Engine · P&W CANADA PT6A-60A · as of Sep 21, 2026

Resources Engine · Pratt & Whitney Canada ↗ Search FAA TCDS ↗

Distribution · currently registered

By state (top 10)

  • NC 100.0% 1

By decade of manufacture

  • 1960s 100.0% 1

NTSB records

No NTSB-recorded events match HELIO HST-550 in the indexed corpus.

Airworthiness directives

5 directive(s) on file. Showing the most recent 5.

  • Aug 17, 2020

    Airworthiness Directives; Aspen Avionics, Inc.

    The FAA is correcting an airworthiness directive (AD) that published in the Federal Register. The AD applies to certain Aspen Avionics, Inc., Evolution Flight Display (EFD) EFD1000 Emergency Backup Display, EFD1000 Multi-Function Display, and EFD1000 Primary Flight Display systems installed on various airplanes. As pu…

    Atlas AD Federal Register ↗
  • Jul 31, 2020

    Airworthiness Directives; Aspen Avionics, Inc.

    The FAA is adopting a new airworthiness directive (AD) for certain Aspen Avionics, Inc., Evolution Flight Display (EFD) EFD1000 Emergency Backup Display, EFD1000 Multi-Function Display, and EFD1000 Primary Flight Display systems installed on various airplanes. This AD imposes operating restrictions on these display sy…

    Atlas AD Federal Register ↗
  • Jan 23, 2019

    Airworthiness Directives; Aspen Avionics, Inc., Evolution Flight Display Units

    We are adopting a new airworthiness directive (AD) for certain Aspen Avionics, Inc. (Aspen), Evolution Flight Display (EFD) EFD1000 Primary Flight Display (PFD), EFD1000 Multi-Function Display (MFD), EFD1000 Emergency Backup Display (EBD), and EFD500 MFD units installed on various aircraft. This AD requires disabling…

    Atlas AD Federal Register ↗
  • Jul 14, 2005

    Airworthiness Directives; Hartzell Propeller Inc. Models HC-B3TN-2, HC-B3TN-3, HC-B3TN-5, HC-B3MN-3, HC-B4TN-3, HC-B4TN-5, HC-B4MN-5, HC-B4MP-3, HC-B4MP-5, and HC-B5MP-3 Propellers

    The FAA is adopting a new airworthiness directive (AD) for Hartzell Propeller Inc. models HC-B3TN-2, HC-B3TN-3, HC-B3TN-5, HC- B3MN-3, HC-B4TN-3, HC-B4TN-5, HC-B4MN-5, HC-B4MP-3, HC-B4MP-5, and HC- B5MP-3 propellers, installed with propeller mounting bolts, part number (P/N) B-3339. This AD requires initial and repeti…

    Atlas AD Federal Register ↗
  • Apr 26, 1996

    Airworthiness Directives; Hartzell Propeller Inc. HC-A3V, HC-B3M, HC-B3T, HC-B4M, HC-B4T, and HC-B5M Series Propellers

    This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Hartzell Propeller Inc. (Hartzell) HC-A3V, HC-B3M, HC-B3T, HC-B4M, HC- B4T, and HC-B5M series propellers. This proposal would require hub replacement over a 10-year time period with a concurrent blade and blade clamp inspec…

    Atlas AD Federal Register ↗

Type certificate data sheets · 1 match in the FAA catalog

  • A4EA Helio Aircraft LLC Historical Rev 14 · 10/13/2005

    Models: HST-550, HST-550A (USAF AU-24A)

    Atlas TCDS DRS ↗

Supplemental type certificates · 111 on file

+ 81 more STCs on file

PMA replacement parts · 1 on file

Advisory circulars & Federal Register

Registered N-numbers · 1

1 of 1 ● NTSB events on file · orange tails have Atlas pages · Look up queries the live FAA registry (owner, address, last airworthiness)
N-number St Year NTSB FAA
N550TG NC 1964 · Look up ↗

Source — FAA Aircraft Registry

Sources