Safety record in brief:3 NTSB accidents (substantial damage at worst, latest Sep 2013)11 ADs may apply
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The fatigue failure of the upper two tailboom attachment points, which resulted in the tailboom separating from the fuselage during logging operations. Contributing to the accident was poor maintenance throughout the helicopter’s operational life.
From NTSB records; matched by serial number.Read NTSB report (search CAROL for WPR13FA411)
The pilot-in-command's failure to maintain sufficient distance from a transmission wire, arcing of the transmission wire, the failure of company personnel to utilize a nonconducting cable, and an inadequate procedure utilized by the construction project manager to ensure adequate fault protection on an energized transmission wire. Factors in the accident were a failure of the helicopter operator…
From NTSB records; matched by serial number.Read NTSB report (search CAROL for ANC99TA058)
A COMPLETE LOSE OF ENGINE POWER DUE TO A TOTAL DISINTEGRATION OF THE TURBINE WHEEL.
From NTSB records; matched by serial number.Read NTSB report (search CAROL for ANC91LA059)
These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
| AD | Subject | Effective | Applies to |
|---|---|---|---|
| 2022-10-02 | Engine Controls | Jun 28, 2022 | Engine (T5313B) |
| 2014-03-10 | Various Restricted Category Helicopters | Mar 26, 2014 | Airframe (UH-1B)Only with: Restricted category helicopters with cable assembly part number 205-001-720-001 installed. |
| 2006-11-16 | Honeywell International Inc. T5311A, T5311B, T5313B, T5317A, T5317A-1, and T5317B Series… | Jul 5, 2006 | Engine (T5313B)Only with: Engines using GPECS (formerly Chandler Evans) engine fuel control regulator assembly models TA-2S, TA-2G, TA-2F, TA-7, or TA-10. |
| 2002-20-01 | Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and… | Nov 6, 2002 | Airframe (UH-1B)Only with: Main rotor tension-torsion strap P/N 204-012-122-1, 204-012-122-5, 2601399, or 2606650 installed; manufactured by BHTI for the US Armed Forces. |
| 2002-15-04 | Honeywell International, Inc., (formerly AlliedSignal, Inc. and Textron Lycoming)… | Sep 10, 2002 | Engine (T5313B)Only with: Engines with centrifugal compressor impellers having serial numbers 83317, 83327, 83328, or 83330 installed. |
| AD | Subject | Effective | Applies to |
|---|---|---|---|
| 2002-13-51 | Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and… | Aug 19, 2002 | Airframe (UH-1B)Only with: Tail rotor grip P/N 205-011-711-101 installed; helicopters manufactured by Bell for the U.S. Armed Forces. |
| 2002-01-31 | Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, UH-1P, and… | Feb 1, 2002 | Airframe (UH-1B)Only with: Manufactured for the U.S. Armed Forces, with main rotor mast P/N 204-011-450-007, -105, or -109, or main rotor trunnion P/N 204-011-105-001 installed. |
| 2000-15-21 R1 | Bell Helicopter Textron Inc.-Manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B… | Nov 7, 2000 | Airframe (UH-1B)Only with: Manufactured by BHTI for the U.S. Armed Forces, with main rotor mast assembly P/N 204-011-450-001 or -005 installed. |
| 2000-15-21 | Bell Helicopter Textron Inc.-Manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B… | Aug 9, 2000 | Airframe (UH-1B)Only with: Main rotor mast assembly P/N 205-011-450-001 or -005 installed. |
| 99-07-15 | Bell Helicopter Textron, Inc.- manufactured Model HH-1K, SW204, SW204HP, SW205… | May 3, 1999 | Airframe (UH-1B)Only with: Tail rotor yoke P/N 212-011-702 (all dash numbers), P/N 212-010-704 (all dash numbers), or P/N 212-010-744 (all dash numbers) installed. |
| 97-20-09 | Bell Helicopter Textron (Bell)- manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B… | May 28, 1998 | Airframe (UH-1B)Only with: Tailboom vertical fin spar P/N 205-032-899, 205-030-846, or 205-032-851, all dash numbers, installed. |
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
No Service Difficulty Reports found for this airframe since 1995.