# N53AG: 1972 Bell UH-1H

- Status: Valid registration
- Airframe: [Bell UH-1H](https://openairdocs.org/model/bell-uh-1h) (registry code 1181407, 15 seats)
- Engine: [Lycoming T53-L-13B](https://openairdocs.org/engine/lycoming-t53-l-13b) (registry code 41220)
- Serial number: 72-21588
- Year built: 1972
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Restricted, agriculture and pest control, aerial surveying, forest, patrolling, other
- Airworthiness date: November 3, 2016
- Certificate issued: August 3, 2007
- Expires: January 31, 2028
- Mode S code: A6AE1B
- Registered owner: [Coastal Helicopters Inc](https://openairdocs.org/faa-owner/COASTAL%20HELICOPTERS%20INC)
- Location: [Panama City, FL](https://openairdocs.org/faa-place/FL/Panama%20City)
- Owner type: Corporation
- Owner's area on the map: 30.1804° N, 85.5061° W: Placed by OpenAirDocs at the center of ZIP code 32404, within about 7 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=53AG
- Page: https://openairdocs.org/aircraft/N53AG

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 26 in force

### Matched by airframe (Bell UH-1H)

- [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 2021-15-14](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 92-23-01](https://openairdocs.org/ad/92-23-01): Main Rotor Pillow Blocks · Bell Helicopter Textron 204B, 205A, 205A-1 and 10 more. Effective Apr 23, 1993
- [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

### Matched by engine (Lycoming T53-L-13B)

None in force.

### 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 80-17-09](https://openairdocs.org/ad/80-17-09) (historical): Main Rotor Straps · Bell Helicopter Textron 204B, 205A-1, 212 and 16 more. Effective Sep 15, 1980

## Information bulletins (advisory) (2 in force)

- [SAIB SW-18-29R1](https://openairdocs.org/saib/SW-18-29R1): Rotorcraft Tail Boom, Attach Structure Failure. Issued Feb 19, 2019
- [SAIB SW-12-38](https://openairdocs.org/saib/SW-12-38): Emergency Push Out  Window Retention. Issued Jul 30, 2012
- [SAIB SW-18-29](https://openairdocs.org/saib/SW-18-29) (historical): Rotorcraft Tail Boom, Attach Structure Failure. Issued Oct 1, 2018

## NTSB investigations

None matched to N53AG.

## FAA accident and incident reports

None matched to N53AG.

## Service difficulty reports (23)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [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 AGQA088876](https://openairdocs.org/sdr/AGQA088876), Aug 12, 2003: PUMP. BROKEN. PUMP PRODUCING FLUXUATING OIL PRESSURE
- [SDR LS1R074932](https://openairdocs.org/sdr/LS1R074932), Jul 20, 2001: CYLINDER. WORN. PART IS WORN EXCESSIVELY.
- [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 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 LS1R066010](https://openairdocs.org/sdr/LS1R066010), Feb 17, 2000: AUDIO PANEL. FAILED. ICS BOX DOES NOT TRANSMIT.
- [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.
- [SDR AGQA065691](https://openairdocs.org/sdr/AGQA065691), Jan 28, 2000: BEARING. LEAKING. BEARING IS LEAKING.
- [SDR AGQA065689](https://openairdocs.org/sdr/AGQA065689), Jan 28, 2000: SUPPORT. CRACKED. SUPPORT IS CRACKED.
- [SDR AGQA065679](https://openairdocs.org/sdr/AGQA065679), Jan 28, 2000: COUPLING. CHIPPED. COUPLING HAS CHIPPED TOOTH.
- [SDR 99ZZZX2751](https://openairdocs.org/sdr/99ZZZX2751), Jun 17, 1999: PUMP. DAMAGED. FUEL PUMP SOUNDS REAL ROUGH LIKE BEARINGS GROWLING. REMOVED AND REPLACED.
- [SDR 99ZZZX2243](https://openairdocs.org/sdr/99ZZZX2243), Apr 29, 1999: BEARING. ROUGH. ROUGH GRIP BEARING. REMOVED AND REPLACED.
- [SDR 99ZZZX241](https://openairdocs.org/sdr/99ZZZX241), Dec 22, 1998: UNIVERSAL. DAMAGED. BEARING HAS BECOME UNSTAKED. REMOVED AND REPLACED.
- [SDR 98ZZZX4348](https://openairdocs.org/sdr/98ZZZX4348), Oct 23, 1998: VOLT REGULATOR. FAILED. VOLTAGE REGULATOR WILL NOT PRODUCE VOLTAGE.
- [SDR 98ZZZX3551](https://openairdocs.org/sdr/98ZZZX3551), Jul 10, 1998: DAMPER. DAMAGED. SIGHT GLASS CLOUDY. REMOVED AND REPLACED.
- [SDR 98ZZZX3550](https://openairdocs.org/sdr/98ZZZX3550), Jul 10, 1998: GEAR. WORN. GEAR ON MOTOR SHAFT HAS WORN BUSHING ALLOWING GEAR TO DIS-ENGAGE FROM LIGHT GEAR. REMOVED AND REPLACED.
- [SDR 98ZZZX3549](https://openairdocs.org/sdr/98ZZZX3549), Jul 10, 1998: DAMPER. DAMAGED. SIGHT GLASS CLOUDY. REMOVED AND REPLACED.

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other Bell UH-1H aircraft: https://openairdocs.org/model/bell-uh-1h/aircraft.md
- The Lycoming T53-L-13B engine: https://openairdocs.org/engine/lycoming-t53-l-13b.md

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