# Williams Helicopter UH-1H

- Type: Aircraft model (FAA registry)
- Registry code: 9790870
- Manufacturer (registry): WILLIAMS HELICOPTER CORP
- Model: UH-1H
- Aircraft type: Rotorcraft
- Category: Rotorcraft
- Engines: 1 · Turbo-shaft
- Seats: 15
- Weight class: Up to 12,499 lb
- Certification: Type certificated
- Data sheet: [TCDS H7SO](https://openairdocs.org/tcds/H7SO) (OpenAirDocs)
- Holder: Overseas Aircraft Support  Inc.
- Registered aircraft: 6
- Page: https://openairdocs.org/model/williams-helicopter-uh-1h

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 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 2021-26-16](https://openairdocs.org/ad/2021-26-16): Engine/Transmission Coupling · Arrow Falcon Exporters UH-1H and SW205 (UH-1H). Effective Feb 25, 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 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 2010-14-12](https://openairdocs.org/ad/2010-14-12): Landing Gear System · Overseas Aircraft Support UH-1H, UH-1F, UH-1H and 40 more. Effective Jul 23, 2010
- [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 89-20-12](https://openairdocs.org/ad/89-20-12): Tail Rotor Hub Assembly · Overseas Aircraft Support 204B, 205A, 205A-1 and 8 more. Effective Aug 15, 1990
- [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

Historical (superseded or no longer in force):

- [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
- [AD 2000-22-51](https://openairdocs.org/ad/2000-22-51) (historical): Main Rotor Mast or Trunnion · Arrow Falcon Exporters UH-1H, UH-1F, HH-1K and 33 more. Effective Dec 26, 2000
- [AD 2000-08-53](https://openairdocs.org/ad/2000-08-53) (historical): Main Rotor System · AST UH-1F, HH-1K, TH-1F and 32 more
- [AD 97-20-09](https://openairdocs.org/ad/97-20-09) (historical): Vertical fin spar · Arrow Falcon Exporters UH-1H, UH-1F, UH-1F and 33 more. Effective May 28, 1998
- [AD 97-20-09 PL](https://openairdocs.org/ad/97-20-09-PL) (historical): Tailboom Vertical Fin Spar · California Department of Forestry UH-1F, UH-1F, TH-1F and 31 more

## Information bulletins (advisory) (3)

- [SAIB SW-12-38](https://openairdocs.org/saib/SW-12-38): Emergency Push Out  Window Retention. Issued Jul 30, 2012
- [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 (6)

- [N247PV](https://openairdocs.org/aircraft/N247PV): [Pacific Valley Aviation Inc](https://openairdocs.org/faa-owner/PACIFIC%20VALLEY%20AVIATION%20INC), [Arbuckle, CA](https://openairdocs.org/faa-place/CA/Arbuckle), built 1965, S/N 65-9649
- [N40729](https://openairdocs.org/aircraft/N40729): [Hlh Leasing LLC](https://openairdocs.org/faa-owner/HLH%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), S/N 69-15233
- [N458CC](https://openairdocs.org/aircraft/N458CC): [Elkhorn Aviation Inc](https://openairdocs.org/faa-owner/ELKHORN%20AVIATION%20INC), [Baker City, OR](https://openairdocs.org/faa-place/OR/Baker%20City), built 1967, S/N 67-17678
- [N710WD](https://openairdocs.org/aircraft/N710WD): [A&P Helicopters Inc](https://openairdocs.org/faa-owner/A%26P%20HELICOPTERS%20INC), [Richvale, CA](https://openairdocs.org/faa-place/CA/Richvale), S/N 65-09761
- [N902HE](https://openairdocs.org/aircraft/N902HE): [Down East Emergency Medicine Institute](https://openairdocs.org/faa-owner/DOWN%20EAST%20EMERGENCY%20MEDICINE%20INSTITUTE), [Orono, ME](https://openairdocs.org/faa-place/ME/Orono), S/N 67-17396
- [N918TG](https://openairdocs.org/aircraft/N918TG): [Bell Asset Management Inc](https://openairdocs.org/faa-owner/BELL%20ASSET%20MANAGEMENT%20INC), [Higley, AZ](https://openairdocs.org/faa-place/AZ/Higley), S/N 65-10117

## NTSB investigations (6)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR24LA299](https://openairdocs.org/ntsb/WPR24LA299), Aug 30, 2024: Williams Helicopter UH-1H (N710WD), Colusa, CA, substantial damage. Probable cause: The pilot’s failure to set collective friction which resulted in collective bounce and subsequent loss of control.
- [NTSB WPR18LA004](https://openairdocs.org/ntsb/WPR18LA004), Oct 13, 2017: Western International Avia UH 1H (N247PV), Arbuckle, CA, substantial damage. Probable cause: A collective control malfunction for reasons that could not be determined.
- [NTSB WPR14LA206](https://openairdocs.org/ntsb/WPR14LA206), May 23, 2014: Williams Helicopter UH 1H (N260TA), Waitsburg, WA, substantial damage. Probable cause: An extreme vibration immediately after entering forward flight for reasons that could not be determined because postaccident examination of the helicopter did not reveal any anomalies that would have…
- [NTSB WPR12LA039](https://openairdocs.org/ntsb/WPR12LA039), Nov 15, 2011: Williams Helicopter UH-1H (N502AW), Grand Canyon, AZ, substantial damage. Probable cause: The loss of main rotor power due to a main rotor transmission failure from a lack of lubrication.
- [NTSB LAX06LA134](https://openairdocs.org/ntsb/LAX06LA134), Apr 1, 2006: Bell UH-1H (N710WD), Yuba City, CA, substantial damage. Probable cause: The pilot's in-flight loss of control of the helicopter for undetermined reasons. A factor was the trees.
- [NTSB SEA01TA172](https://openairdocs.org/ntsb/SEA01TA172), Sep 17, 2001: Bell 205 (N458CC), Troy, MT, substantial damage. Probable cause: The pilot-in-command's failure to maintain seperation/clearance from trees while maneuvering.

## FAA accident and incident reports (4)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20171013024369A](https://openairdocs.org/incident/20171013024369A), Oct 13, 2017: Williams Helicopter Corp UH-1H (N247PV), Arbuckle, CA, Substantial damage. On October 13, 2017 at approximately 1000 hours, UH1 aircraft N247PV experienced a collective surge while attempting to re-position to a landing cart from the…
- [Accident 20140523008029A](https://openairdocs.org/incident/20140523008029A), May 23, 2014: Williams Helicopter Corp UH-1H (N260TA), Waitsburg, WA, Substantial damage. Take off from owner operators property, during transisitional lift helicopter crashed under unkown circumstances in Waitsburg, WA.
- [Accident 20111115026789A](https://openairdocs.org/incident/20111115026789A), Nov 15, 2011: Williams Helicopter Corp UH-1H (N502AW), AZ, Substantial damage. The pilot departed valle, AZ (40G) enroute to hualapai hilltop - supai, AZ (approximately 43 miles nw of valle, AZ). The pilot was flying at approximately 500"…
- [Accident 20060401004989A](https://openairdocs.org/incident/20060401004989A), Apr 1, 2006: Bell UH1H (N710WD), CA, Destroyed. (-23) On 04/01/2006 at 1306 PST, helicopter N710WD collided with trees and the ground. The helicopter was destroyed and the pilot stated: the control forces…

## Service difficulty reports (93, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2020FA0000296](https://openairdocs.org/sdr/2020FA0000296), Feb 12, 2020: PIN. DISLODGED. PRIMARY CAUSE OF DAMAGE TO ACCESSORY DRIVE, PIN CAME OUT OF SLEEVE BUSHING AND DAMAGED ADJOINING COMPONENTS. ENGINE IS STILL UNDER TEARDOWN AND INSPECTION.
- [SDR 2018FA0000537](https://openairdocs.org/sdr/2018FA0000537), Jul 24, 2018: SUPPORT. INFLT SEPARATION. THE SWASHPLATE SUPPORT FAILED AT 1916 HOURS IN SERVICE, PRIOR TO ITS SCHEDULED RETIREMENT LIFE OF 3600 HOURS, FOR UNKNOWN REASONS. TOTAL TIME TRACKING ERRORS WE
- [SDR 2018FA0000193](https://openairdocs.org/sdr/2018FA0000193), Jun 20, 2018: QUILL. DISCONNECTED. AIRCRAFT EXPERIENCED A LOSS OF TAIL ROTOR CONTROL DURING FLIGHT REQUIRING THE PILOT TO CONDUCT A HOVERING AUTOROTATION THAT DAMAGED THE LANDING GEAR AND BELLY O
- [SDR 2018FA0000086](https://openairdocs.org/sdr/2018FA0000086), Jan 18, 2018: GRIP. CRACKED. LOWER TANG LEADING EDGE HAS A CRACK EXTENDING THRU GRIP TANG TO BLADE BOLT BUSHING. FOUND DURING PREFLIGHT INSPECTION.
- [SDR 2017FA0000601](https://openairdocs.org/sdr/2017FA0000601), Jul 25, 2017: LINE. RUPTURED. ONE REPORT DESCRIBING LOSS OF HYDRAULIC FLUID AND SYS PRESSURE. MECHANICS NOTED A HIGH FREQUENCY VIBRATION IN THE HYDRAULIC SYS SPECIFIC TO TUBE WHICH CAN LEAD 
- [SDR 2017FA0000035](https://openairdocs.org/sdr/2017FA0000035), Jan 27, 2017: BOLT. LOOSE. DURING INSPECTION, FOUND THE ENGINE COMPRESSOR STATOR VANE RETAINING BOLT HANGING OUT OF IT'S RECESSED MOUNT HOLE. ENGINE BLEED BAND WAS PREVENTING BOLT FROM FA
- [SDR 2014FA0000320](https://openairdocs.org/sdr/2014FA0000320), May 14, 2014: LONGERON. CRACKED. DURING HOVER, PILOT HEARD A BANG FROM THE REAR OF THE ACFT. PILOT LANDED BACK AT STAGING AREA. DURING INVESTIGATION, DETERMINED THE TAILBOOM JUST AFT OF THE UPP
- [SDR 2012FA0000656](https://openairdocs.org/sdr/2012FA0000656), Sep 17, 2012: BLADE. MISINSTALLED. DURING A PHASE 1 INSPECTION, TAIL ROTOR BLADE CLEARANCE FROM VERTICAL STABILIZER WAS INSUFFICIENT AS IT HAD BEEN IMPROPERLY SHIMMED AND INSTALLED ON THE 90 DEGR
- [SDR 2012FA0000655](https://openairdocs.org/sdr/2012FA0000655), Sep 17, 2012: SCISSORS. MISINSTALLED. DURING A PHASE 1 INSPECTION, SCISSOR HAD BEEN IMPROPERLY ASSEMBLED AND INSTALLED ON THE SLEEVE CAUSING DAMAGE TO THE SLEEVE.
- [SDR 2012FA0000654](https://openairdocs.org/sdr/2012FA0000654), Sep 17, 2012: GRIP. MISINSTALLED. DURING A PHASE 1 INSPECTION, MAIN ROTOR GRIP HAD BEEN IMPROPERLY ASSEMBLED AND INSTALLED ON THE MAIN ROTOR YOKE CAUSING DAMAGE TO THE NEEDLE BEARING AND RACE.
- [SDR 2012FA0000308](https://openairdocs.org/sdr/2012FA0000308), Apr 24, 2012: CAP. BROKEN. CAP BROKEN AT BS 238, LBL 14.
- [SDR 2011FA0000657](https://openairdocs.org/sdr/2011FA0000657), Oct 3, 2011: BLADE. CRACKED. PILOT NOTED A VERTICAL VIBRATION DURING FLIGHT. UPON VISUAL INSPECTION, IT WAS FOUND THAT MAIN ROTOR BLADE HAD CRACKED 90 INCHES FROM BLADE TIP THROUGH THE T/E 
- [SDR 2011FA0000518](https://openairdocs.org/sdr/2011FA0000518), Aug 2, 2011: PINION GEAR. FAILED. GEARBOX WAS O/H AS PART OF AN AIRFRAME REFURBISHMENT PROJECT. THE INPUT QUILL SEAL HAD DEVELOPED AN OIL LEAK AND UPON INVESTIGATION IT WAS FOUND THAT THE INPUT 
- [SDR 2007FA0000812](https://openairdocs.org/sdr/2007FA0000812), Sep 19, 2007: QUILL ASSY. WORN. QUILL INTERNAL SPLINES WORN AND DAMAGED IN QUILL TUBE CONTACT AREA
- [SDR 2006FA0001017](https://openairdocs.org/sdr/2006FA0001017), Oct 20, 2006: SUPPORT BRACKET. LOOSE. TAIL BOOM ELEVATOR SUPPORT BRACKET LOOSE. (WORKING RIVETS/SITE OF PREVIOUS REPAIR WITH PULL TYPE RIVETS).
- [SDR 2006FA0000530](https://openairdocs.org/sdr/2006FA0000530), May 18, 2006: FITTING. CRACKED. TAIL BOOM ATTACH FITTING CRACKED UPPER LEFT [TAIL BOOM SIDE]
- [SDR 2006FA0000529](https://openairdocs.org/sdr/2006FA0000529), May 18, 2006: FITTING. CRACKED. TAIL BOOM ATTACH FITTING CRACKED UPPER LEFT [TAIL BOOM SIDE]
- [SDR 2006FA0000528](https://openairdocs.org/sdr/2006FA0000528), May 18, 2006: FITTING. CRACKED. TAIL BOOM ATTACH FITTING CRACKED UPPER LEFT [TAIL BOOM SIDE]
- [SDR 2006FA0000231](https://openairdocs.org/sdr/2006FA0000231), Feb 27, 2006: FITTING. FRACTURED. AC LANDED FOR SHUTDOWN AFTER OPERATING FOR APPROX 3 FLIGHT HOURS, AC WAS SHAKING DURING SHUTDOWN. DURING POST FLIGHT INSP IT WAS FOUND THAT UPPER LT MOUNT HARD 
- [SDR ASI200501A](https://openairdocs.org/sdr/ASI200501A), Jul 15, 2005: PIN. FAILED. DURING 1200 OVERHAUL OUTBOARD FITTING/STRAP PIN P/N 204-012-104-005, S/N DIFS12334 WAS FOUND BROKEN IN HALF. PIN HAD 1085.1 HOURS SINCE NEW. DISCOLORATION AND C
- [SDR ASI200501](https://openairdocs.org/sdr/ASI200501), Jul 15, 2005: PIN. FAILED. DURING 1200 OVERHAUL OUTBOARD FITTING/STRAP PIN WAS FOUND BROKEN IN HALF. PIN HAD 1085.1 HOURS SINCE NEW. DISCOLORATION AND CONDITION OF BREAK INDICATES THE BRE
- [SDR 2005FA0000785](https://openairdocs.org/sdr/2005FA0000785), May 11, 2005: DRIVE SHAFT. VIBRATION. ( 2005-5-1) PILOT NOTICED VIBRATION AND RUMBLE COMING FROM THE MAIN TRANSMISSION AREA ON TAKEOFF. MECHANIC DID TROUBLE TROUBLESHOOTING PROCEDURES AND NOTICED ON
- [SDR 2004FA0000333](https://openairdocs.org/sdr/2004FA0000333), Mar 25, 2004: STRAP. CRACKED. AIRCRAFT WAS EXPERIENCING VIBRATIONS DURING FLIGHT, MAINTENANCE WAS UNABLE TO REMOVE THE VIBRATION THROUGH TRACK AND BALANCE PROCEDURES. THE MAIN ROTOR ASSEMBLY
- [SDR AGQA088876](https://openairdocs.org/sdr/AGQA088876), Aug 12, 2003: PUMP. BROKEN. PUMP PRODUCING FLUXUATING OIL PRESSURE
- [SDR LS12003F00000](https://openairdocs.org/sdr/LS12003F00000), Jun 6, 2003: SKIN. CRACKED. THE TAILBOOM FIRST 2 UPPER SKINS HAD NUMEROUS CRACKS. UNDER NORMAL OPERATIONS THESE CRACKS WOULD NEVER MATERIALIZE. THE AIRCRAFT HAS BEEN DOING LIFTING WORK. MU
- [SDR CDFROTW1](https://openairdocs.org/sdr/CDFROTW1), Apr 25, 2003: BATTERY. LEAKING. AT REMOVAL OF ELT BATTERY AT POSTED REMOVAL DATE IT WAS DISCOVERED THE BATTERY PACK HAD LEAKED AND CORRODED COMPONENTS WITHIN THE CASE. THERE WAS ALSO A CRACK N
- [SDR AUS20021231](https://openairdocs.org/sdr/AUS20021231), Oct 15, 2002: FITTING. FAULTY. (AUS) TAILBOOM LH LOWER ATTACHMENT FITTING ON FUSELAGE HAD OVERSIZE HOLES ALLOWING THE HILOK' PINS TO LOOSEN. SUSPECT CAUSED BY POOR REPAIR WORK.
- [SDR XVI2002F00000](https://openairdocs.org/sdr/XVI2002F00000), Apr 11, 2002: FRAME. CRACKED. X-RAY INSPECTION REVEALED A CRACK IN THE FRAME FLANGE APPROXIMATELY .1250 INCH LONG CONTAINED BY ADJACENT FASTENER HOLE. THE CRACK IS LOCTED IN THE 3 OCLOCK POS
- [SDR LS1R074932](https://openairdocs.org/sdr/LS1R074932), Jul 20, 2001: CYLINDER. WORN. PART IS WORN EXCESSIVELY.
- [SDR LS1R074916](https://openairdocs.org/sdr/LS1R074916), Jul 20, 2001: BATTERY. WEAK. PART IS WEAK.
- [SDR LS1R072592](https://openairdocs.org/sdr/LS1R072592), Apr 16, 2001: REGULATOR. OUT OF ADJ. REGULATOR UNABLE TO HOLD ADJUSTMENT.
- [SDR LS1R072590](https://openairdocs.org/sdr/LS1R072590), Apr 16, 2001: CONTROL PANEL. INOPERATIVE. LIGHTS WILL NOT COME ON. CONTROL PANEL INOPERATIVE.
- [SDR LS1R072190](https://openairdocs.org/sdr/LS1R072190), Apr 10, 2001: CABLE DRUM. STRETCHED. CABLE DRUM STRETCHED.
- [SDR LS1R071917](https://openairdocs.org/sdr/LS1R071917), Apr 6, 2001: SHAFT. WORN. PART IS WORN EXCESSIVELY.
- [SDR LS1R071916](https://openairdocs.org/sdr/LS1R071916), Apr 6, 2001: SHAFT. WORN. PART IS WORN EXCESSIVELY.
- [SDR 20010502CW005](https://openairdocs.org/sdr/20010502CW005), Apr 2, 2001: BLADE. CRACKED. A CRACK WAS NOTICED INSIDE DENT AFT OF THE SPAR ON THE TOP OF THE MAIN ROTOR BLADE. REMOVAL OF PAINT DETERMINED THE CRACK TO BE IN EXCESS OF 6 INCHES LONG. THE 
- [SDR 20001017SH029](https://openairdocs.org/sdr/20001017SH029), Sep 19, 2000: CROSSTUBE. CRACKED. DURING REFUEL, FOUND FORWARD CROSSTUBE AT RIGHT SADDLE CRACKED. POSSIBLE CAUSE, WEAR. (X)
- [SDR 20001017SH030](https://openairdocs.org/sdr/20001017SH030), Sep 1, 2000: ANGLE. CRACKED. FOUND ANGLE CRACKED AT LEFT LOWER TAILBOOM MOUNT. POSSIBLE CAUSE IS STRESS TORQUE OF TAILBOOM TO FUSELAGE. (X)
- [SDR LS1R066445](https://openairdocs.org/sdr/LS1R066445), Feb 29, 2000: BEARING. ROUGH. BEARING EXTREMELY ROUGH, AND RATCHETY.
- [SDR LS1R066421](https://openairdocs.org/sdr/LS1R066421), Feb 23, 2000: BEARING. DAMAGED. BEARING SLINGING GREASE.
- [SDR LS1R066420](https://openairdocs.org/sdr/LS1R066420), Feb 23, 2000: BEARING. DAMAGED. BEARING SLINGING GREASE.
- [SDR LS1R066419](https://openairdocs.org/sdr/LS1R066419), Feb 23, 2000: BEARING. DAMAGED. BEARING SLINGING GREASE.
- [SDR LS1R066011](https://openairdocs.org/sdr/LS1R066011), Feb 17, 2000: AUDIO PANEL. FAILED. ICS BOX DOES NOT TRANSMIT.
- [SDR LS1R066010](https://openairdocs.org/sdr/LS1R066010), Feb 17, 2000: AUDIO PANEL. FAILED. ICS BOX DOES NOT TRANSMIT.
- [SDR LS1R065962](https://openairdocs.org/sdr/LS1R065962), Feb 15, 2000: LINEAR ACTUATOR. INOP. LINEAR ACTUATOR IS INOPERATIVE.
- [SDR LS1R065943](https://openairdocs.org/sdr/LS1R065943), Feb 11, 2000: VOLT REGULATOR. SHORTED. VOLTAGE REGULATOR SHORTED OUT.
- [SDR LS1R065941](https://openairdocs.org/sdr/LS1R065941), Feb 11, 2000: CONTROLLER. FAILED. INTERPHONE DOES NOT TRANSMIT.
- [SDR LS1R065936](https://openairdocs.org/sdr/LS1R065936), Feb 11, 2000: VOLT REGULATOR. SHORTED. VOLTAGE REGULATOR SHORTED OUT.
- [SDR AGQA065942](https://openairdocs.org/sdr/AGQA065942), Feb 11, 2000: VOLT REGULATOR. INOPERATIVE. VOLTAGE REGULATOR INOPERABLE. WILL NOT REGULATE.
- [SDR AGQA065935](https://openairdocs.org/sdr/AGQA065935), Feb 11, 2000: VOLT REGULATOR. INOPERATIVE. VOLTAGE REGULATOR INOPERABLE, WILL NOT REGULATE.

All 93: https://openairdocs.org/model/williams-helicopter-uh-1h/reports.md

## STCs that may be installed (OpenAirDocs) (29)

Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SR12332SE](https://openairdocs.org/stc/SR12332SE): Installation of Mechanical Specialties, LLC Human External Cargo (HEC) and non-HEC Hook System. Mechanical Specialties, LLC
- [STC SR02796SE](https://openairdocs.org/stc/SR02796SE): Installation of Human External Cargo (HEC) system. Boost Systems LLC
- [STC SR00266SE](https://openairdocs.org/stc/SR00266SE): Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheet (TCDS) H15NM. Overseas Aircraft Support Inc
- [STC SH8609SW](https://openairdocs.org/stc/SH8609SW): Fabrication of Isolair Eliminator II Model 4600-205 fire fighting system. Isolair Inc
- [STC SR01776SE](https://openairdocs.org/stc/SR01776SE): Fabrication, installation, and maintenance of the Isolair Helicopters, Inc., Model 9002 High Cross tubes. Isolair Inc
- [STC SR00143DE](https://openairdocs.org/stc/SR00143DE): Installation of an upgraded 42 degree Tail Rotor gearbox, P/N 212-040-003. Midwest Aerospace TC LLC
- [STC SR00713SE](https://openairdocs.org/stc/SR00713SE): Installation of Onboard Systems International Cargo Hook Kit. Onboard Systems International
- [STC SR02475SE](https://openairdocs.org/stc/SR02475SE): Installation of a Tailboom Motion Detection System. Aircraft Structural Repair Inc
- [STC SR02492LA](https://openairdocs.org/stc/SR02492LA): Installation of a Helicopter Technology Company main rotor blade assembly. Helicopter Technology Co
- [STC SR02641SE](https://openairdocs.org/stc/SR02641SE): Installation of a Service Deck. Northwest Heli-Structures Inc
- [STC SR02070SE](https://openairdocs.org/stc/SR02070SE): Fabrication of Dart D205-770-011 Replacement Engine Mount Kit. Dart Aerospace USA Inc
- [STC SR00929SE](https://openairdocs.org/stc/SR00929SE): Fabrication of tail boom mounted strakes. BLR Aerospace LLC
- [STC SR01039SE](https://openairdocs.org/stc/SR01039SE): Fabrication of tail boom mounted strakes in accordance with Master Drawing List Number BL-UH1H-01, Revision D, dated September 10, 2001, or later Federal Aviation Administration (FAA)-approved revision; and installation of this strake system. BLR Aerospace LLC
- [STC SR01470SE](https://openairdocs.org/stc/SR01470SE): Fabrication and Installation of Fast Fin System. BLR Aerospace LLC
- [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 SR02413LA](https://openairdocs.org/stc/SR02413LA): Installation of an AKV, Inc Exceedence and Trend Monitoring System kit P/N ETM1000. AKV Inc
- [STC ST04270AT](https://openairdocs.org/stc/ST04270AT): Install the VTOL ASSALT V3 Windscreen Laminate Kit. VTOL LLC
- [STC SR00767SE](https://openairdocs.org/stc/SR00767SE): Fabrication of Helipro spar replacement system. Vector Aerospace Helicopter Services USA Inc
- [STC SR00267SE](https://openairdocs.org/stc/SR00267SE): Fabrication and Installation of a Bell Model 212 vertical tail fin and rotor, 42 and 90 gearboxes, and 212 push rod anti-torque control system. Vector Aerospace Helicopter Services USA Inc
- [STC SR01742NY](https://openairdocs.org/stc/SR01742NY): Installation of extended height landing gear. Dart Aerospace Limited
- [STC SR01196LA](https://openairdocs.org/stc/SR01196LA): Installation of Honeywell (Lycoming) T53-L-703 engine to replace Honeywell (Lycoming) T53-L-13/13B/-13BA engine. Responsible ACO is Los Angeles, NM-L. Minuteman Aviation Inc
- [STC SR01946SE](https://openairdocs.org/stc/SR01946SE): Installation of the Mechanical Specialties, Model UH606. Mechanical Specialties Inc
- [STC SR09257RC](https://openairdocs.org/stc/SR09257RC): Fabrication, modification, and installation of a new vertical fin spar in accordance with Global Helicopter Technology, Inc., Drawing number VTF-030-800, Revision D, dated March 26, 2001, or later FAA approved revision. Global Spar LLC
- [STC SR02204LA](https://openairdocs.org/stc/SR02204LA): Installation of an AKV, INC. N1/N2 Cycle Counter, PN UH1T53CC. AKV Inc
- [STC SR00103SE](https://openairdocs.org/stc/SR00103SE): Installation of Aviation Development Corporation oil filter. Aviation Development Corporation
- [STC SR01298NY](https://openairdocs.org/stc/SR01298NY): Installation of replacement crosstubes P/N D212-664. Dart Aerospace Limited
- [STC SR00563NY](https://openairdocs.org/stc/SR00563NY): Installation of Skidtubes and associated saddles. Dart Aerospace Limited
- [STC SR00332NY](https://openairdocs.org/stc/SR00332NY): Installation of Avionics Specialties power analyzer and recorder no. SL17009 and SL17061. Aerosonic Corporation
- [STC SR01395NY](https://openairdocs.org/stc/SR01395NY): Installation of adjustable engine mount. Dart Aerospace Limited

## PMA parts (OpenAirDocs) (42)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this model on its data sheet, so check the FAA record before relying on it. Newest first.

- [650-430-100-100](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID190077510020260512112137.0001): MECHANICAL SPECIALTIES, LLC MODEL 650-430-100-100ADVANCED DUEL EXTERNAL CARGO HOOK /ADEC™HOOK SYSTEM. Mechanical Specialties LLC · PMA PQ2180NM · Modification part · Apr 29, 2026
- [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID191057840020220809130912.0001): Aviation Devices & Electronic Components LLC (Av-DEC) · PMA PQ3846SW · May 10, 2022
- [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125346967420220809102542.0001): Aviation Devices & Electronic Components LLC (Av-DEC) · PMA PQ3846SW · Apr 18, 2022
- [AG844000-15](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID105424422720220408135800.0001): Gasket – UHF/VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Feb 8, 2022
- [AG728000-52](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID109983963720220408135722.0001): Gasket – Satcom Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Jan 26, 2022
- [AG627000-23](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID188504655320220408135659.0001): Gasket – Marker Beacon. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Dec 15, 2021
- [AG358000-08](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID171617793620220408135812.0001): Gasket – ELT Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 17, 2021
- [AG627000-12](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID160662726920220408140239.0001): Gasket – Marker Beacon Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 17, 2021
- [AG843000-17](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID499609163202111101105060.0001): Gasket - UHF/VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Aug 9, 2021
- [AG358000-07](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID416938804202107271951410.0001): Gasket – ELT Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Dec 11, 2020
- [AG843000-17](https://drs.faa.gov/browse/excelExternalWindow/44F91AF19B0D8D4586258591003A1785.0001): Gasket - UHF/VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Jan 1, 2020
- [AG843000-15](https://drs.faa.gov/browse/excelExternalWindow/445335953945E98886258560003BF2F7.0001): Gasket - VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Aug 18, 2019
- [AG247000-04](https://drs.faa.gov/browse/excelExternalWindow/F4D9B388DAECF53586258553004D4A85.0001): Gasket - L-Band Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Jun 25, 2019
- [AG433000-47](https://drs.faa.gov/browse/excelExternalWindow/E2A5A39A5A171734862582A6006802FD.0001): Gasket - L-Band Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · May 3, 2018
- [AG358000-02](https://drs.faa.gov/browse/excelExternalWindow/AD3E13BFB5D9CCD2862582A6006802FB.0001): Gasket - ELT Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · May 3, 2018
- [VTF-030-800](https://drs.faa.gov/browse/excelExternalWindow/08FE4C33AD32CCE886257A78004BEA50.0001): Vertical Fin Spar Installation. Mechanical Specialties LLC · PMA PQ2180NM · Replaces VTF-030-800-001 · Aug 15, 2012
- [BH200101-7](https://drs.faa.gov/browse/excelExternalWindow/FB9C8837DFA5F4D98525703D00694524.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [205-W-1001-1](https://drs.faa.gov/browse/excelExternalWindow/F621AE426BE45FF68525703D005A1D68.0001): Wire Harness. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-5](https://drs.faa.gov/browse/excelExternalWindow/EB9E800D9E08B0388525703D0069451B.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-6](https://drs.faa.gov/browse/excelExternalWindow/E4471776AE1022388525703D00694520.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-8](https://drs.faa.gov/browse/excelExternalWindow/E32096A86F17E4CA8525703D00694529.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [205-D-1001-3](https://drs.faa.gov/browse/excelExternalWindow/D9B595E6D9B091518525703D005A1D67.0001): Lower Tail Fairing. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-3](https://drs.faa.gov/browse/excelExternalWindow/D958BEA718FEE62E8525703D0069450E.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-1](https://drs.faa.gov/browse/excelExternalWindow/C988BE185A06E3898525703D00694503.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-2](https://drs.faa.gov/browse/excelExternalWindow/C93E3F40C5AE116F8525703D00694509.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-1](https://drs.faa.gov/browse/excelExternalWindow/BE558A87BFA581248525703D00694502.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [205-D-1001-1](https://drs.faa.gov/browse/excelExternalWindow/B1BE7268803C56478525703D005A1D66.0001): Upper Tail Fairing. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-5](https://drs.faa.gov/browse/excelExternalWindow/A77D782AAA64177E8525703D0069451A.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-7](https://drs.faa.gov/browse/excelExternalWindow/A5CFAB732961EE918525703D00694525.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-6](https://drs.faa.gov/browse/excelExternalWindow/9BA33563A0EED8CB8525703D0069451F.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-1](https://drs.faa.gov/browse/excelExternalWindow/95D883A9D235FBC98525703D00694506.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-4](https://drs.faa.gov/browse/excelExternalWindow/7E0915AFB2AC435C8525703D00694515.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-3](https://drs.faa.gov/browse/excelExternalWindow/65BF946EAA82D1368525703D0069450F.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-2](https://drs.faa.gov/browse/excelExternalWindow/6208BBF3B92CD0368525703D00694508.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-8](https://drs.faa.gov/browse/excelExternalWindow/49E5F75F3479B9F08525703D0069452A.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-4](https://drs.faa.gov/browse/excelExternalWindow/4694B0FAEC990B0B8525703D00694514.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-3](https://drs.faa.gov/browse/excelExternalWindow/42662D949C0710798525703D00694512.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-4](https://drs.faa.gov/browse/excelExternalWindow/3752CD6F58389E848525703D00694519.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [BH200101-2](https://drs.faa.gov/browse/excelExternalWindow/2DD9BE8E3046C1A68525703D0069450C.0001): Strake Tail Boom. Boundary Layer Research Inc · Modification part · Oct 20, 2004
- [VTF-030-800](https://drs.faa.gov/browse/excelExternalWindow/EB1C2B603DCAD9FB852570420058F0B3.0001): Spar, Forward, Vertical Fin Installation. Global Helicopter Technology Inc · Modification part · Oct 28, 2001
- [VTF-030-800](https://drs.faa.gov/browse/excelExternalWindow/5FE267204057CDAC8625736800522D92.0001): Spar, Forward, Vertical Fin Installation. Global Helicopter Technology Inc · PMA PQ0644SW · Modification part · Apr 30, 2001
- [BH200101-4](https://drs.faa.gov/browse/excelExternalWindow/AAAE129184EE02568525703D006946DA.0001): Strake. Boundary Layer Research Ltd · Modification part · Jun 22, 2000

## The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

- [Bell UH-1H](https://openairdocs.org/model/bell-uh-1h): 291 registered aircraft, registry code 1181407
- [Garlick Helicopters UH-1H](https://openairdocs.org/model/garlick-helicopters-uh-1h): 7 registered aircraft, registry code 3740005
- [Northwest Rotorcraft UH-1H](https://openairdocs.org/model/northwest-rotorcraft-uh-1h): 6 registered aircraft, registry code 9640002
- [Southwest Florida UH-1H](https://openairdocs.org/model/southwest-florida-uh-1h): 3 registered aircraft, registry code 118141C
- [Bell Helicopter UH-1H (205)](https://openairdocs.org/model/bell-helicopter-uh-1h-205): 3 registered aircraft, registry code 1181430
- [Richards Heavylift Helo UH-1H](https://openairdocs.org/model/richards-heavylift-helo-uh-1h): 2 registered aircraft, registry code 118142G
- [Arrow Falcon Exporters UH-1H](https://openairdocs.org/model/arrow-falcon-exporters-uh-1h): 2 registered aircraft, registry code 1500001
- [Rotorcraft Development UH-1H](https://openairdocs.org/model/rotorcraft-development-uh-1h): 2 registered aircraft, registry code 3741202
- [Western International Avia UH-1H](https://openairdocs.org/model/western-international-avia-uh-1h): 2 registered aircraft, registry code 9640001
- [Precision Helicopters UH-1H](https://openairdocs.org/model/precision-helicopters-uh-1h): 1 registered aircraft, registry code 1181429
- [Lillquist Brien UH-1H](https://openairdocs.org/model/lillquist-brien-uh-1h): 0 registered aircraft, registry code 056244L
- [Bell/Southern Aero UH-1H](https://openairdocs.org/model/bell-southern-aero-uh-1h): 0 registered aircraft, registry code 118141E

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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.