# Bell TH-1L - Type: Aircraft model (FAA registry) - Registry code: 1180817 - Manufacturer (registry): BELL - Model: TH-1L - Aircraft type: Rotorcraft - Category: Rotorcraft - Engines: 1 · Turbo-shaft - Seats: 6 - Weight class: Up to 12,499 lb - Certification: Type certificated - Data sheet: [TCDS H4NM](https://openairdocs.org/tcds/H4NM) (OpenAirDocs) - Holder: Bell Textron Inc. - Registered aircraft: 0 - Page: https://openairdocs.org/model/bell-th-1l Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker. ## ADs that may apply (OpenAirDocs) Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2024-19-17](https://openairdocs.org/ad/2024-19-17): Rotorcraft flight control · Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies, P/N… (STC SR03408CH). Effective Oct 11, 2024 - [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023 - [AD 2022-20-14](https://openairdocs.org/ad/2022-20-14): Main Rotor Gearbox · Bell Textron 204B, 205A, 205A-1 and 20 more. Effective Dec 27, 2022 - [AD 2022-22-12](https://openairdocs.org/ad/2022-22-12): Nose/Tail Landing Gear Structure/Axle · Replacement crosstubes P/N D212-664 (Dart Aerospace STC SR01298NY). Effective Nov 22, 2022 - [AD 2022-21-11](https://openairdocs.org/ad/2022-21-11): Main rotor blades · Bell Textron 204B, 205A, 205A-1 and 11 more. Effective Nov 16, 2022 - [AD 2022-05-10](https://openairdocs.org/ad/2022-05-10): Cabin Equipment/Furnishings · Airbus Helicopters AS332L, AS332L1, AS332L2 and 57 more. Effective Apr 20, 2022 - [AD 2022-06-05](https://openairdocs.org/ad/2022-06-05): Main Rotor System · WSH HH-1K, TH-1F, TH-1L and 11 more. Effective Mar 16, 2022 - [AD 2021-15-14](https://openairdocs.org/ad/2021-15-14): Rotorcraft Tail Boom · California Department of Forestry UH-1H, UH-1F, TH-1L and 39 more. Effective Aug 30, 2021 - [AD 2014-03-10](https://openairdocs.org/ad/2014-03-10): Tail Rotor Control System · JJASPP Engineering Services UH-1H, UH-1F, TH-1L and 35 more. Effective Mar 26, 2014 - [AD 2013-13-06](https://openairdocs.org/ad/2013-13-06): Main rotor head · California Department of Forestry UH-1H, UH-1F, TH-1L and 36 more. Effective Sep 10, 2013 - [AD 2013-13-14](https://openairdocs.org/ad/2013-13-14): Main Rotor Head · JJASPP Engineering Services UH-1H, UH-1F, TH-1L and 33 more. Effective Jul 24, 2013 - [AD 2012-17-10](https://openairdocs.org/ad/2012-17-10): Main Rotor Blades · California Department of Forestry UH-1H, UH-1F, TH-1L and 36 more. Effective Sep 28, 2012 - [AD 2012-14-12](https://openairdocs.org/ad/2012-14-12): Tail Rotor Blades · California Department of Forestry UH-1H, UH-1F, TH-1L and 36 more. Effective Sep 4, 2012 - [AD 2006-19-05](https://openairdocs.org/ad/2006-19-05): Tail rotor (T/R) slider · California Department of Forestry UH-1H, UH-1F, TH-1L and 36 more. Effective Oct 16, 2006 - [AD 2002-20-01](https://openairdocs.org/ad/2002-20-01): TT strap · Overseas Aircraft Support UH-1H, UH-1F, TH-1L and 34 more. Effective Nov 6, 2002 - [AD 2002-13-51](https://openairdocs.org/ad/2002-13-51): Tail Rotor (T/R) Grip · Overseas Aircraft Support UH-1H, UH-1F, TH-1L and 34 more. Effective Aug 19, 2002 - [AD 2002-01-31](https://openairdocs.org/ad/2002-01-31): Retirement Index Number (RIN) for Masts · Overseas Aircraft Support UH-1H, UH-1F, TH-1L and 36 more. Effective Mar 8, 2002 - [AD 2000-15-21 R1](https://openairdocs.org/ad/2000-15-21-R1): Main Rotor Mast Assemblies · Overseas Aircraft Support UH-1H, UH-1F, TH-1L and 33 more. Effective Nov 22, 2000 - [AD 99-25-12](https://openairdocs.org/ad/99-25-12): Tailboom Vertical Fin Spar · California Department of Forestry UH-1H, UH-1F, TH-1L and 31 more. Effective Jan 11, 2000 - [AD 99-07-15](https://openairdocs.org/ad/99-07-15): Tail Rotor Yoke · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 33 more. Effective May 3, 1999 - [AD 97-01-06](https://openairdocs.org/ad/97-01-06): Tail Rotor Slider · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 32 more. Effective Feb 13, 1997 - [AD 96-12-26](https://openairdocs.org/ad/96-12-26): Clean and Inspect Tail Rotor Blade · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 36 more. Effective Sep 23, 1996 - [AD 95-10-08](https://openairdocs.org/ad/95-10-08): Tail Rotor Control System · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 34 more. Effective May 26, 1995 - [AD 94-22-09](https://openairdocs.org/ad/94-22-09): Tail Rotor Driveshaft · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 34 more. Effective Nov 22, 1994 - [AD 90-03-10](https://openairdocs.org/ad/90-03-10): Tail Rotor Grips · Arrow Falcon Exporters UH-1H, UH-1F, 204B and 33 more. Effective Oct 18, 1991 - [AD 90-10-05](https://openairdocs.org/ad/90-10-05): Tail Rotor Gearbox · Bell Helicopter Textron TH-1L, UH-1E, UH-1L and 17 more. Effective Jun 5, 1990 - [AD 89-08-06](https://openairdocs.org/ad/89-08-06): Transmission Internal Sump Oil Filter · AST UH-1F, TH-1L, UH-1E and 22 more. Effective Feb 7, 1990 - [AD 88-25-05](https://openairdocs.org/ad/88-25-05): Tail Rotor Grip Assembly · AST UH-1F, 204B, 205A and 25 more. Effective Dec 13, 1988 - [AD 88-08-01](https://openairdocs.org/ad/88-08-01): Rod End Bearing Assembly · Bell Helicopter Textron TH-1L, UH-1E, UH-1L and 5 more. Effective May 6, 1988 Historical (superseded or no longer in force): - [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021 - [AD 2021-15-52](https://openairdocs.org/ad/2021-15-52) (historical): Main Rotor System · Arrow Falcon Exporters UH-1H, UH-1F, TH-1L and 39 more. Effective Aug 13, 2021 ## Information bulletins (advisory) (4) - [SAIB SW-18-29R1](https://openairdocs.org/saib/SW-18-29R1): Rotorcraft Tail Boom, Attach Structure Failure. Issued Feb 19, 2019 - [SAIB SW-18-29](https://openairdocs.org/saib/SW-18-29) (historical): Rotorcraft Tail Boom, Attach Structure Failure. Issued Oct 1, 2018 - [SAIB SW-06-64](https://openairdocs.org/saib/SW-06-64): . Issued Aug 17, 2006 - [SAIB SW-05-37](https://openairdocs.org/saib/SW-05-37): . Issued Mar 17, 2005 ## Registered aircraft None registered with this model now. ## STCs approved for it (10) - [STC SR00119DE](https://openairdocs.org/stc/SR00119DE): Installation of an upgraded 42 degree Tail Rotor gearbox, P/N 212-040-003, and Control Cables. Midwest Aerospace TC LLC - [STC SR00332NY](https://openairdocs.org/stc/SR00332NY): Installation of Avionics Specialties power analyzer and recorder no. SL17009 and SL17061.. Aerosonic Corporation - [STC SR00563NY](https://openairdocs.org/stc/SR00563NY): Installation of Skidtubes and associated saddles. Dart Aerospace Limited - [STC SR01298NY](https://openairdocs.org/stc/SR01298NY): Installation of replacement crosstubes P/N D212-664.. Dart Aerospace Limited - [STC SR01742NY](https://openairdocs.org/stc/SR01742NY): Installation of extended height landing gear.. Dart Aerospace Limited - [STC SR03408CH](https://openairdocs.org/stc/SR03408CH): Install Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies, P/N AA-204-310-101-101 or AA-204-310-101-103. Airwolf Aerospace LLC - [STC SR09167RC](https://openairdocs.org/stc/SR09167RC): Replacement of tail rotor control roller chain.. Midwest Aerospace TC LLC - [STC SR09177RC](https://openairdocs.org/stc/SR09177RC): Modification of the vertical fin spar. Midwest Aerospace TC LLC - [STC SR09316RC](https://openairdocs.org/stc/SR09316RC): Fabrication, modification, and installation of a new vertical fin spar in accordance with Global Helicopter Technology, Inc., Drawing number VTF-030-801, Revision B, dated April 5, 2001, or later FAA approved revision.. Global Spar LLC - [STC SR12332SE](https://openairdocs.org/stc/SR12332SE): Installation of Mechanical Specialties, LLC Human External Cargo (HEC) and non-HEC Hook System. Mechanical Specialties, LLC ## NTSB investigations (7) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB SEA98LA017](https://openairdocs.org/ntsb/SEA98LA017), Nov 25, 1997: Bell TH-1L (N8160G), Canby, OR, substantial damage. Probable cause: The pilot's allowance of excessive airspeed resulting in the long-line hook impacting the tail rotor, and his allowance of an airspeed bleed-off preventing a successful run-on landing due to a loss… - [NTSB SEA97LA025](https://openairdocs.org/ntsb/SEA97LA025), Nov 5, 1996: Garlick TH-1L (N465JR), Leavenworth, WA, destroyed, 1 fatal. Probable cause: Fatigue failure of the vertical stabilizer spar cap and subsequent loss of the rotorcraft's vertical stabilizer. Factors include inadequate inspection or trouble-shooting of the aircraft tail cone… - [NTSB SEA95LA110](https://openairdocs.org/ntsb/SEA95LA110), Jun 1, 1995: Garlick TH-1L (N27FL), Umpqua, OR, substantial damage, 1 fatal. Probable cause: THE PILOT'S FAILURE TO MAINTAIN CLEARANCE WITH A TREE, RESULTING IN A TAIL ROTOR BLADE STRIKE ON THE TREE WHICH DISABLED THE TAIL ROTOR. CONTRIBUTING TO THE ACCIDENT WAS THE 150-FOOT-HIGH ROCK BLUFF. - [NTSB LAX94LA132](https://openairdocs.org/ntsb/LAX94LA132), Feb 23, 1994: Bell TH-1L (N204AP), Etna, CA, substantial damage. Probable cause: THE FAITUGE OF THE GEAR TOOTH WHICH CAUSED THE FAILURE OF THE 42-DEGREE GEAR BOX. - [NTSB BFO90DOA01](https://openairdocs.org/ntsb/BFO90DOA01), Aug 1, 1990: Bell TH-1L (N152RR), Galax, VA, substantial damage. Probable cause: THE LOST OF ENGINE POWER BECAUSE OF A COMPRESSOR STALL. - [NTSB MIA89LA081](https://openairdocs.org/ntsb/MIA89LA081), Feb 8, 1989: Bell TH-1L (N204AP), Greenville, FL, substantial damage. Probable cause: INSTALLATION OF THE IMPROPER SPRAG CLUTCH ASSEMBLY BY THE OWNERS MAINTENANCE PERSONNEL RESULTING IN FAILURE OF THE SPRAG CLUTCH AND THE LOSS OF TRANSMISSION DRIVE. - [NTSB ATL88FA213](https://openairdocs.org/ntsb/ATL88FA213), Jul 12, 1988: Bell TH-1L (N465JR), Walterboro, SC, substantial damage ## FAA accident and incident reports (7) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 19971125034969A](https://openairdocs.org/incident/19971125034969A), Nov 25, 1997: Bell TH1L (N8160G), Canby, OR, Substantial damage. Bell TH-1L acft crashed und unk circ. Canby, OR. (.19)on November 25, 1997, approxiamtely 1120 pacific standard time, a Bell TH-1L rotorcraft, N8160G,… - [Accident 19961105034799A](https://openairdocs.org/incident/19961105034799A), Nov 5, 1996: Bell TH1L (N465JR), Leavenworth, WA, Substantial damage, 1 fatal. Helicopter involved in logging operation, lost tail rotor, while picking up a load, crashed. - [Accident 19950601043629A](https://openairdocs.org/incident/19950601043629A), Jun 1, 1995: Bell TH1L (N27FL), Umpoua, OR, Substantial damage, 1 fatal. During hover for log pickup. Went into spin. Crashed. Tail rotor sheared off striking trees. No mechanical problems - [Accident 19940223002819A](https://openairdocs.org/incident/19940223002819A), Feb 23, 1994: Bell TH1L (N204AP), Etna, CA, Substantial damage. Vibration after log pickup tried dump load. Lost tail rotor. Uncontrolled spin to impact. 42 degree gear box failed - [Accident 19900801033739A](https://openairdocs.org/incident/19900801033739A), Aug 1, 1990: Bell TH1L (N152RR), Hillsville, VA, Substantial damage. Engine quit while spraying powerline right of way. Autorotated into trees. No cause for power loss in report. - [Accident 19890208031229A](https://openairdocs.org/incident/19890208031229A), Feb 8, 1989: Bell TH1L (N204AP), Greenville, FL, Substantial damage. Loud noise,lost RPM. Autorotated into trees. Improper sprag clutch installed,became disengaged from stress and wear - [Accident 19880712026399A](https://openairdocs.org/incident/19880712026399A), Jul 12, 1988: Bell TH13T (N465JR), Walterboro, SC, Substantial damage. Vibration on sling load dropped load spin right to crash. Tail rotor gear box failed. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.