Registry / Alexander Schleicher Gmbh & Co / ASK 21 / N421EF

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N421EF V

Alexander Schleicher Gmbh & Co ASK 21 · 2013 · Boulder, CO

FAA Registry ↗ FlightAware ↗ FlightRadar24 ↗ ADS-B Globe ↗

This aircraft — FAA registration facts

N421EF is a 2013 Alexander Schleicher Gmbh & Co ASK 21 (serial 21905), registered to Soaring Society Of Boulder (corporation) in Boulder, CO. Its FAA registration is recorded as v and expires October 2027; the airworthiness certificate dates from August 2013 (13 years ago). It carries a None NONE engine, the engine on 79% of registered Alexander Schleicher Gmbh & Co ASK 21s. Its Mode-S transponder broadcasts the ICAO 24-bit address A4FFC0. It is one of 26 Alexander Schleicher Gmbh & Co ASK 21 aircraft on the FAA registry. Soaring Society Of Boulder holds 3 aircraft on the registry.

Registered owner
Soaring Society Of Boulder
Owner type
Corporation
Based in
Boulder, CO
Serial number
21905
Year built
2013 · 13 yrs old
Airworthiness class
Standard – Utility
FAA status
V
Mode-S / ICAO24
A4FFC0 · 51177700 octal
Certificate issued
Oct 23, 2014
Airworthiness date
Aug 29, 2013
Last FAA activity
Mar 24, 2023
Registration expires
Oct 31, 2027
FAA region
S

Source: FAA aircraft registry (public record). Community reviews and photos below.

Engine on this aircraft

Engine
None NONE
Engine type
None
FAA engine code
00000

15 of the 19 registered Alexander Schleicher Gmbh & Co ASK 21 carry this engine (79%), across 2 engine variants on the type.

Source: FAA engine reference (ENGINE.txt), matched on this registration's engine code.

Community facts about N421EF

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Flight history & live tracking recent positions on file

ICAO24: a4ffc0
Track N421EF on external services
FlightAware FlightRadar24 ADS-B Exchange Globe ADS-B.lol Globe FAA Registry
Last known — 21 hours ago N421EF
Observed 2026-09-27 11:23:56 MST
Auto-refresh • Updated 0s ago
Ground speed
61 kt
Altitude (baro)
8,950 ft
Track
1.0°
Squawk
—
Wind / OAT
—
Autopilot target
—
Lat 40.01463, Lng -105.26126
Map loads when scrolled into view …
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Aircraft Type — ACFTREF 3801539

Alexander Schleicher Gmbh & Co ASK 21
Engines: 1
Type: piston
Seats: 2
Category: Standard

Engine — CODE 00000

Manufacturer: None
Model: NONE
Type: None

FAA Registration Record

N-Number: N421EF
Serial Number: 21905
Year Manufactured: 2013
ACFTREF Code: 3801539
Engine Code: 00000
Status: V (V)
Certification: Standard – Utility
Type Aircraft: Glider (1)
Type Engine: None (0)
Source: master

Documents & resources

Commonly available reference sources for the Alexander Schleicher Gmbh & Co ASK 21. Always confirm against the manufacturer's current, authoritative publication for your specific aircraft.

View the Alexander Schleicher Gmbh & Co ASK 21 model overview, reviews & photos →

These are commonly available reference sources. FerryFlight Hub does not provide sample or generated documents on this page.

FerryFlight Hub is independent and not affiliated with, endorsed by, or sponsored by any aircraft manufacturer, the FAA, or any document publisher. References are NOT for operational, navigational, or flight-planning use — always rely on the current, FAA-approved documentation for the specific aircraft. We link to official or publicly available sources and do not host or redistribute copyrighted material. Provided "as is," without warranty of any kind as to accuracy, completeness, or currency.

Report a problem with this document (wrong fitment, outdated, or copyright / takedown) · Full document policy

Transponder / ADS-B

Mode S (octal): 51177700
ICAO 24-bit (hex): A4FFC0
ADS-B Exchange ↗ | FlightAware ↗

Registrant

Soaring Society Of Boulder
Corporation
View all 3 aircraft registered to this owner →
Po Box 17577
Boulder, CO, 803080577
FAA Region: S

Key Dates

Certificate Issued Oct 23, 2014
Airworthiness Aug 29, 2013
Expiration Oct 31, 2027
Last Activity Mar 24, 2023
Data as of Sep 7, 2026

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