- Registered owner
- Soaring Society Of Boulder
- Location
- Boulder, CO
- Owner type
- Corporation
- Serial number
- 21905
- Year built
- 2013
- Type
- Glider
- Engine
- None
- Airworthiness
- Standard, utility
- Airworthiness date
- August 29, 2013
- Certificate issued
- October 23, 2014
- Expires
- October 31, 2027
- Mode S code
- A4FFC0
From the FAA registry file of October 24, 2026.
On this page
Airworthiness directives that may apply · 13
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1984 | 1 |
|---|---|
| 1985 | 1 |
| 1987 | 1 |
| 1997 | 1 |
| 1998 | 6 |
| 1999 | 1 |
| 2014 | 1 |
| 2017 | 1 |
Airframe · Alexander Schleicher ASK 21
AD 2017-02-11Flight ControlsAD 2014-06-07Placards and MarkingsAD 95-11-15 R1Parallel RockerAD 98-12-03Rudder Panel, Airbrake Bellcrank, Rear Canopy HingeAD 98-10-07SFM - Weight and BalanceAD 98-09-13S-Shaped Rudder Pedal Tube InspectionAD 98-08-29SFM - Stall and Spin Recovery InformationAD 98-06-38Elevator PushrodAD 98-06-37Tow Release Cable AssemblyAD 97-08-06 R1Quick ConnectorsAD 87-10-07Rudder PedalAD 85-06-07Main Wheel BoxAD 84-23-03Placard And Afm ChangesInformation bulletins that may apply
Advisory, not mandatory.
No bulletins matched this aircraft’s models
NTSB investigations
No NTSB investigations matched to N421EFMatched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Alexander Schleicher ASK 21 aircraft
FAA incident reports
No FAA accident or incident reports matched to N421EFMatched by N-number and event date, checked against the reported make and model. Reports from before this aircraft carried the mark are under Earlier aircraft. Reports on Alexander Schleicher ASK 21 aircraft
Service difficulty reports
No reports matched to N421EFGeneral aviation reporting is voluntary. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Reports on Alexander Schleicher ASK 21 aircraft
STCs that may be installed
No STCs matched this aircraft’s modelsSTCs change type-certificated designs, and this aircraft isn’t type certificated.