Type Record · As of May 3, 2026
UNKNOWN UNKNOWN
Glider
Registered
1
NTSB Events
0
Airworthiness Directives
44
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered UNKNOWN UNKNOWN aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
By Decade of Manufacture
- Unknown 100.0% 1
02 / NTSB Records
Events involving UNKNOWN UNKNOWN aircraft
No NTSB-recorded events match UNKNOWN UNKNOWN in the indexed corpus.
02c / Academic Research
Scholarly work mentioning UNKNOWN UNKNOWN
Papers and reports across NASA, NTSB, FAA CAMI, AOPA ASI, Embry-Riddle, arXiv, and the broader academic graph that mention this airframe. Title or keyword match — drill into each for full abstract + author list + PDF link.
- arXiv 2026 · arXiv preprint
Decentralized Ergodic Coverage Control in Unknown Time-Varying Environments
A key challenge in disaster response is maintaining situational awareness of an evolving landscape, which requires balancing exploration of unobserved regions with sustained monitoring of changing Reg…
- arXiv 2025 · arXiv preprint
Bistatic Target Detection by Exploiting Both Deterministic Pilots and Unknown Random Data Payloads
Integrated sensing and communication (ISAC) plays a crucial role in 6G, to enable innovative applications such as drone surveillance, urban air mobility, and low-altitude logistics.
- arXiv 2025 · arXiv preprint
Autonomy Architectures for Safe Planning in Unknown Environments Under Budget Constraints
Mission planning can often be formulated as a constrained control problem under multiple path constraints (i.e., safety constraints) and budget constraints (i.e., resource expenditure constraints).
- arXiv 2025 · arXiv preprint
Intuitive Human-Drone Collaborative Navigation in Unknown Environments through Mixed Reality
Considering the widespread integration of aerial robots in inspection, search and rescue, and monitoring tasks, there is a growing demand to design intuitive human-drone interfaces.
- arXiv 2025 · arXiv preprint
Minimum-Time Sequential Traversal by a Team of Small Unmanned Aerial Vehicles in an Unknown Environment with Winds
We consider the problem of transporting multiple packages from an initial location to a destination location in a windy urban environment using a team of SUAVs. Each SUAV carries one package.
- arXiv 2024 · arXiv preprint
Improving the Region of Attraction of a Multi-rotor UAV by Estimating Unknown Disturbances
This study presents a machine learning-aided approach to accurately estimate the region of attraction (ROA) of a multi-rotor unmanned aerial vehicle (UAV) controlled using a linear quadratic regulator…
Browse the full corpus — academia portal ↗
03 / Airworthiness Directives
FAA directives applicable to UNKNOWN UNKNOWN
44 directive(s) on file. Showing the most recent 25 · 19 more in the Federal Register.
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Apr 14, 2026
Airworthiness Directives; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters
The FAA proposes to adopt a new airworthiness directive (AD) for all Columbia Helicopters, Inc. Model 234 helicopters and all Restricted Category Model CH-47D helicopters. This proposed AD was prompted by reports of corrosion detected on certain flight control rigid connecting links (connecting link). This proposed AD…
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Mar 26, 2026
Airworthiness Directives; Diamond Aircraft Industries Inc. Airplanes
The FAA is superseding Airworthiness Directive (AD) 2020-14- 06, which applied to all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes. AD 2020-14-06 required replacing affected parts, inspecting the fuel tank chambers, and removing rubber material that has detached from the fuel tan…
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Mar 4, 2026
Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by reports of certain fuel transfer float valves failing in the closed position, preventing normal fuel transfer between the center and wing fuel tanks…
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Feb 25, 2026
Airworthiness Directives; Aerospace & Defense Oxygen Systems SaS (Part of Safran Aerosystems) (Formerly Known as Air Liquide) Portable Breathing Equipment (PBE)
The FAA is adopting a new airworthiness directive (AD) for certain Aerospace & Defense Oxygen Systems SaS portable breathing equipment (PBE). This AD was prompted by reports of occurrences of PBE not delivering oxygen once donned. This AD requires replacing affected PBE and prohibits the installation of affected PBE.…
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Jan 30, 2026
Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK117 D-3 helicopters. This AD was prompted by a report of excessive wear on the bearing bolts, installed on the swashplate, connecting the cardan ring and the control ring assembly. This AD requires init…
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Jan 5, 2026
Airworthiness Directives; Airbus SAS Airplanes
The FAA is adopting a new airworthiness directive (AD) for all Airbus SAS Model A319 and A320 series airplanes; and Model A321-211, - 212, -213, -231, -232, -251N, -252N, -253N, -251NX, -252NX, -253NX, - 271N, -272N, -271NX, and -272NX airplanes. This emergency AD was prompted by an uncommanded and limited pitch down…
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Dec 30, 2025
Airworthiness Directives; Aerospace & Defense Oxygen Systems SaS (Part of Safran Aerosystems) (Formerly Known as Air Liquide)
The FAA is superseding Airworthiness Directive (AD) 2025-25- 02, which applied to all aircraft equipped with certain Aerospace & Defense Oxygen Systems SaS portable breathing equipment (PBE). AD 2025- 25-02 required incorporating revised procedures for donning the PBE. Since the FAA issued AD 2025-25-02, the agency de…
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Dec 23, 2025
Airworthiness Directives; Diamond Aircraft Industries Inc. Airplanes
The FAA proposes to supersede Airworthiness Directive (AD) 2020-14-06, which applies to all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes. AD 2020-14-06 requires replacing affected parts, inspecting the fuel tank chambers, and removing rubber material that has detached from the fu…
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Dec 9, 2025
Airworthiness Directives; Aerospace & Defense Oxygen Systems SaS (Part of Safran Aerosystems) (Formerly Known as Air Liquide)
The FAA is adopting a new airworthiness directive (AD) for all aircraft equipped with certain Aerospace & Defense Oxygen Systems SaS portable breathing equipment (PBE). This AD was prompted by reports of occurrences of incorrect usage of certain PBEs. This AD requires incorporating revised procedures for donning the P…
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Nov 25, 2025
Airworthiness Directives; Airbus Helicopters
The FAA is superseding Airworthiness Directive (AD) 2021-26- 07, which applies to all Airbus Helicopters Model EC120B helicopters. AD 2021-26-07 requires performing repetitive inspections of the tail rotor (TR) hub body and, depending on the inspection results, replacing certain parts, and accomplishing further inspec…
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Nov 4, 2025
Airworthiness Directives; Polskie Zakłady Lotnicze Sp. z o.o. Airplanes
The FAA is adopting a new airworthiness directive (AD) for all Polskie Zak[lstrok]ady Lotnicze Sp. z o.o. Model PZL M28 05 airplanes. The FAA previously sent this AD as an emergency AD to all known U.S. owners and operators of these airplanes. This AD was prompted by damage found in Frame No. 29 and rudder control uni…
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Oct 15, 2025
Airworthiness Directives; Continental Aerospace Technologies GmbH Engines
The FAA is adopting a new airworthiness directive (AD) for all Continental Aerospace Technologies GmbH (Continental) Model TAE 125-02- 125 engines. This AD was prompted by multiple reports of cracks in the cylinder heads, which can cause engine coolant to leak into the combustion chamber. This AD requires a one-time i…
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Oct 2, 2025
Airworthiness Directives; Fiberglas-Technik Rudolf Lindner GmbH & Co. KG (Type Certificate Previously Held by GROB Aircraft AG, Grob Aerospace GmbH i.l., Grob Aerospace GmbH, Burkhart Grob Luft- und Raumfahrt GmbH & Co. KG) Gliders
The FAA is adopting a new airworthiness directive (AD) for all Fiberglas-Technik Rudolf Lindner GmbH & Co. KG Model G103 TWIN II, G103A TWIN II ACRO, G103C TWIN III ACRO, and G 103 C TWIN III SL gliders. This AD was prompted by a report of corrosion on the inner sides of the welded steel rudder drive plate. This AD re…
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Aug 18, 2025
Airworthiness Directives; Various Airplanes
The FAA is adopting a new airworthiness directive (AD) for all airplanes with certain Pacific Scientific Company rotary buckle assemblies (buckles) installed. This AD was prompted by a report of a manufacturing defect in the screws used inside the buckle. This AD requires inspecting the buckle screws, and depending on…
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Jul 2, 2025
Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, and EC635T2+ helicopters. This AD was prompted by a report of a loss of the tail rotor controls due to a broken control rod of the yaw a…
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Jul 2, 2025
Airworthiness Directives; Airbus Helicopters
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model H160-B helicopters. This AD was prompted by occurrences of premature in-service degradation of the main rotor swashplate assembly (swashplate) bearing. This AD requires repetitively inspecting the swashplate bearing for the presenc…
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Jun 25, 2025
Airworthiness Directives; Airbus Helicopters
The FAA proposes to supersede Airworthiness Directive (AD) 2021-26-07, which applies to all Airbus Helicopters Model EC120B helicopters. AD 2021-26-07 requires performing repetitive inspections of the tail rotor (TR) hub body and, depending on the inspection results, replacing certain parts, and accomplishing further…
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Jun 6, 2025
Airworthiness Directives; Airbus SAS Airplanes
The FAA is adopting a new airworthiness directive (AD) for all Airbus SAS Model A350-941 airplanes. This AD was prompted by an inspection that found several anodic burns on the main landing gear (MLG) bogie beam axles following a high velocity oxygen-fuel (HVOF) stripping process. This AD requires replacement of affec…
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Jun 2, 2025
Airworthiness Directives; Cameron Balloons Ltd. Fuel Cylinders
The FAA is adopting a new airworthiness directive (AD) for Cameron Balloons Ltd. (Cameron) fuel cylinders fitted with certain pressure relief valve (PRV) adaptors on hot air balloons. This AD was prompted by the discovery of cracks on the upper hex portion of PRV adaptors. This AD requires repetitively visually checki…
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May 28, 2025
Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
The FAA is adopting a new airworthiness directive (AD) for certain ATR--GIE Avions de Transport R[eacute]gional Model ATR42-500 and ATR72-212A airplanes. This AD was prompted by a report of potential use of improper material during the production of vertical tail plane (VTP) fittings. This AD requires, for certain air…
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Mar 11, 2025
Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
The FAA is adopting a new airworthiness directive (AD) for all Airbus Canada Limited Partnership (ACLP) Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by a design review of aircraft structural and stress reports that resulted in a revision of operational loads for some aircraft flight phases. This…
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Mar 7, 2025
Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+/EC635T2+, EC135T3, MBB-BK 117 C-2, MBB-BK 117 D-2, and MBB-BK 117 D-3 helicopters. This AD was prompted by reports of malfunctioning emergency fuel sh…
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Feb 18, 2025
Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
The FAA proposes to adopt a new airworthiness directive (AD) for certain ATR--GIE Avions de Transport R[eacute]gional Model ATR42- 500 and ATR72-212A airplanes. This proposed AD was prompted by a report of potential use of improper material during the production of vertical tail plane (VTP) fittings. This proposed AD…
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Feb 13, 2025
Airworthiness Directives; FS 2001 Corp, FS 2002 Corporation, FS 2003 Corporation, Piper, and Piper Aircraft, Inc. Airplanes
The FAA is adopting a new airworthiness directive (AD) for certain FS 2001 Corp, FS 2002 Corporation, FS 2003 Corporation, Piper, and Piper Aircraft, Inc. (Piper) airplanes. This AD was prompted by reports of broken rudders. This AD requires replacing any rudder equipped with a rudder post made from a certain carbon s…
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Feb 11, 2025
Airworthiness Directives; Various Airplanes
The FAA is revising a notice of proposed rulemaking (NPRM) that applied to all airplanes with certain Pacific Scientific Company rotary buckle assemblies (buckles) installed. This action revises the NPRM by expanding the applicability and updating the referenced material. As an option to the actions proposed by this S…
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for UNKNOWN UNKNOWN
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 1 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N605BT | — | — | · | Look up ↗ |
Source — FAA Aircraft Registry · click "Look up" to query the live registry record (owner, address, last airworthiness)
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →