# N159AC: 1970 Sikorsky S-64F

- Status: Valid registration
- Airframe: [Sikorsky S-64F](https://openairdocs.org/model/sikorsky-s-64f) (registry code 8142610, 3 seats)
- Engine: [Pratt & Whitney JFTD12A series](https://openairdocs.org/engine/pratt-whitney-jftd12a-series) (registry code 52047)
- Data sheets: [TCDS H6EA](https://openairdocs.org/tcds/H6EA) (Erickson Incorporated DBA Erickson Air-Crane), [TCDS E15EA](https://openairdocs.org/tcds/E15EA) (Erickson Incorporated DBA Erickson Air-Crane) (OpenAirDocs)
- Serial number: 64084
- Year built: 1970
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, transport
- Airworthiness date: June 8, 1999
- Certificate issued: December 5, 2023
- Expires: December 31, 2030
- Mode S code: A0EBA1
- Registered owner: [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC)
- Location: [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee)
- Owner type: LLC
- Owner's area on the map: 33.8885° N, 84.2895° W: Placed by OpenAirDocs at the center of ZIP code 30341, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=159AC
- Page: https://openairdocs.org/aircraft/N159AC

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. The registry lists only the engine series, so ADs for every Pratt & Whitney JFTD12A model are included.

## ADs that may apply (OpenAirDocs): 9 in force

### Matched by airframe (Sikorsky S-64F)

- [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 2013-23-07](https://openairdocs.org/ad/2013-23-07): Main Rotor Blades · Erickson Air-Crane S-64E and S-64F. Effective Dec 27, 2013
- [AD 2012-26-06](https://openairdocs.org/ad/2012-26-06): Main Rotor Drive System and Tail Rotor System · Erickson Air-Crane S-64F. Effective Apr 16, 2013
- [AD 2012-23-11](https://openairdocs.org/ad/2012-23-11): Rotorcraft Tail Boom · Erickson Air-Crane S-64F. Effective Jan 14, 2013
- [AD 2011-21-12](https://openairdocs.org/ad/2011-21-12): Rotating swashplate assembly · Erickson Air-Crane S-64F. Effective Dec 1, 2011
- [AD 76-06-01](https://openairdocs.org/ad/76-06-01): Hydraulic Pumps · Erickson Air-Crane S-64A, S-64E, S-64F and 12 more. Effective Mar 24, 1976
- [AD 75-11-11](https://openairdocs.org/ad/75-11-11): Gear Box Shaft and Gear Assy · Erickson Air-Crane S-64E and S-64F. Effective Dec 2, 1975

### Matched by engine (Pratt & Whitney JFTD12A series)

- [AD 97-02-13](https://openairdocs.org/ad/97-02-13): Disk rupture · Pratt & Whitney Division JFTD12A-4A (T73P-1) and JFTD12A-5A (T73-P-700). Effective Apr 4, 1997
- [AD 71-24-05](https://openairdocs.org/ad/71-24-05): Compressor Rotor Discs · Pratt & Whitney Division JFTD12A-4A (T73P-1), JFTD12A-5A (T73-P-700), JT12A-6 and 2 more. Effective May 31, 1974

### 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 97-10-15](https://openairdocs.org/ad/97-10-15) (historical): Main Gearbox Second Stage Lower Planetary Plate · Erickson Air-Crane S-64F. Effective Jun 27, 1997
- [AD 77-20-01](https://openairdocs.org/ad/77-20-01) (historical): Main Transmission Lower Planetary Plates · Erickson Air-Crane S-64E and S-64F

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N159AC.

## FAA accident and incident reports (1)

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.

- [Incident 20221001009409I](https://openairdocs.org/incident/20221001009409I), Oct 1, 2022: Sikorsky SK-64 (N159AC), Central Point, OR, Minor damage. The flight was maintenance related for a return to service validation. The portions of the flight leading to the incident were uneventful and the maintenance…

## Service difficulty reports (22)

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 JYDR20201013282](https://openairdocs.org/sdr/JYDR20201013282), Oct 13, 2020: ATTACH BOLT. BROKEN. PILOTS SUDDENLY FELT A VIBRATION AND HEARD A HOWLING NOISE. THEY RETURNED TO THE LANDING SITE AND SHUT DOWN. AT INSPECTION, MAINTENANCE FOUND 1 OF 3 NAS628-15 B
- [SDR JYDR20201008218](https://openairdocs.org/sdr/JYDR20201008218), Oct 7, 2020: ENGINE. OVERTEMP. AIRCRAFT WAS ON SHORT FINAL AT 50 FT AGL WHEN NR 1 ENGINE LOW SPEED CHIME CAME ON. PILOT NOTED DECREASING N1 RPM WITH RISING T% (ROLLBACK). PROPER ENGINE IDENTI
- [SDR JYD2006F00000](https://openairdocs.org/sdr/JYD2006F00000), Dec 9, 2005: BEARING. SPALLED. BEARING OUTER RACE SPALLED AND CRACKED. SPALLING AND CRACK ARE ON NR1 BEARING ROW ONLY. CRACK IS APPROXIMATELY 2.25 INCHES LONG. PROBABLE CAUSE IS UNKNOWN. THE 
- [SDR 2005FA0000819](https://openairdocs.org/sdr/2005FA0000819), Apr 14, 2005: GEAR. CRACKED. TGB AND SERVO ASSY REMOVED FROM ACRFT FOR MAKING METAL. GEARBOX DISASSEMBLED AND DURING VISUAL INSP OF OUTPUT GEAR, ONE TOOTH FOUND CRACKED. FRIVE SIDE OF TOOTH
- [SDR 2005FA0000820](https://openairdocs.org/sdr/2005FA0000820), Apr 13, 2005: TURBINE BLADES. BROKEN. COMPRESSOR ASSY WAS REMOVED FROM AC FOR FAILING VIBRATION ANALYSIS. DURING THE PRELIMINARY INSPECTION IT WAS NOTED THAT A PIECE OF 2ND STAGE TURBINE BLADE OUTER
- [SDR JYDRMDR04069](https://openairdocs.org/sdr/JYDRMDR04069), Dec 6, 2004: HOUSING. CRACKED. MGB WAS REMOVED FOR MAIN SHAFT REPLACEMENT AND OVERHAUL. AFTER DISASSEMBLY OF GEAR BOX, THE UPPER HOUSING WAS LOCALLY BLENDED, ETCHED UNDER THE INPUTS AND INSPE
- [SDR 2005FA0000000](https://openairdocs.org/sdr/2005FA0000000), Nov 30, 2004: BEVEL GEAR. CRACKED. DURING NDT INSPECTION, GEAR WAS MPI`D AND REJECTED FOR CRACKS. LOCATION OF CRACKS WERE IN ATTACHMENT FLANGE BOLT HOLES (18 EACH). EVERY HOLE HAS APPROXIMATELY .
- [SDR MDR04061](https://openairdocs.org/sdr/MDR04061), Aug 19, 2004: BEARING RACE. CRACKED. TAIL ROTOR HEAD WAS REMOVED FROM AC DUE TO SUDDEN LEAKAGE FROM TAIL ROTOR GRIP. DISASSEMBLED TAIL ROTOR HEAD AND FOUND THE SHOULDER BOLT INNER RACE CRACKED ON T
- [SDR 2004F00284](https://openairdocs.org/sdr/2004F00284), Jul 15, 2004: SPACER. CRACKED. COMPRESSOR ASSY WAS REMOVED FROM AN AIRCRAFT FOR A 1000 HOURS SCHEDULED HOT SECTION INSPECTION. DURING TEST RUN, THE ENGINE EXPERIENCED VIBES WHICH WERE OUT OF 
- [SDR 2004F00335](https://openairdocs.org/sdr/2004F00335), Jul 14, 2004: SEAL. BROKEN. COMPRESSOR ASSY REMOVED FROM A/C FOR A 1000 TSO SCHED HOT SECTION INSP. DURING INSP, EVIDENCE RUBBING BETWEEN OUTER SHROUD OF 1ST STAGE N1 BLADES & 1ST STATE OU
- [SDR MDR04050](https://openairdocs.org/sdr/MDR04050), Apr 21, 2004: SUPPORT BEAM. CRACKED. IN THE COURSE OF A POST FLIGHT INSPECTION, THE FIELD MAINTENANCE CREW DISCOVERED A CRACK IN THE RT MGB SUPPORT BEAM APPROXIMATELY STA 333. SL 199 AND RBL 20. TH
- [SDR MDR04047](https://openairdocs.org/sdr/MDR04047), Mar 16, 2004: SPAR. CRACKED. THE BLADE WAS REMOVED FROM THE AIRCRAFT DUE TO A RED BIM INDICATION. DURING A 10 DAY LEAK CHECK, LOSS OF PRESSURE WAS NOTED. FURTHER INVESTIGATION FOUND A .6250
- [SDR MDR04045](https://openairdocs.org/sdr/MDR04045), Mar 10, 2004: HOUSING. CRACKED. DURING ROUTINE FIELD MAINTENANCE INSPECTIONS, A CRACK WAS DISCOVERED UNDER NR 2 INPUT (ARM PIT) APPROXIMATELY 6 INCHES LONG FROM APPROXIMATELY THE 5 TO 8 OCLOCK
- [SDR MDR03034](https://openairdocs.org/sdr/MDR03034), Nov 18, 2003: GEAR. CRACKED. TAIL ROTOR GEARBOX WAS REMOVED FROM AC FOR MAKING METAL. TAIL ROTOR GEARBOX WAS DISASSEMBLED IN THE OVERHAUL SHOP AND VISUALLY FOUND A CRACKED GEAR TOOTH ON THE
- [SDR 20010613CW018](https://openairdocs.org/sdr/20010613CW018), May 21, 2001: BLADE. CRACKED. REMOVED FROM AIRCRAFT FOR BIM INDICATION. PERFORMED LEAK CHECK. DETECTED LEAK AND FOUND CRACK. CRACK IS CHORDWISE, AND .5000 INCH LONG WITH CORROSION PIT LOCATE
- [SDR 98ZZZX2812](https://openairdocs.org/sdr/98ZZZX2812), Jul 6, 1998: ROLLERS. WORN. SUBMITTER STATED THIS MDR AFFECTS S-64E MODEL. ACFT WAS FLYING UNDER NORMAL CONDITIONS WHEN NR 1 AND NR 2 GEN WENT OFF-LINE AND INVERTER POWER WAS NEEDED FOR A/
- [SDR 98ZZZX2255](https://openairdocs.org/sdr/98ZZZX2255), Apr 24, 1998: BLADE. FRACTURED. ON 4-24-98, AIRCRAFT WAS ON A FIRE FIGHTING MISSION. DURING CLIMB-OUT, A LOUD 'BANG' SOUND OCCURRED, FOLLOWED BY A LEFT YAW. THE LOAD OF WATER WAS JETTISONED AN
- [SDR 97ZZZX4347](https://openairdocs.org/sdr/97ZZZX4347), Sep 17, 1997: BRACKET BOLT. CRACKED. DURING OVERHAUL OF THE MAIN ROTOR HEAD, A FLUORESCENT MAGNETIC PARTICLE INSPECTION REVEALED A TOTAL OF 4 CRACK INDICATIONS IN BOLT HEAD TO SHANK RADIUS. LARGEST
- [SDR 97ZZZX3377](https://openairdocs.org/sdr/97ZZZX3377), Jul 10, 1997: MAIN SHAFT. CRACKED. PART WAS MPI'D AND FOUND TO HAVE ONE CRACK INDICATION LOCATED AT THE UPPER END OF THE LOWER SPLINES. THE INDICATION EXTENDS FROM THE SPLINE RADIUS AND GOES TOWA
- [SDR 97ZZZX3013](https://openairdocs.org/sdr/97ZZZX3013), Jun 13, 1997: BLADE. CRACKED. BLADE OPERATED BY ERICKSON FOR APPROXIMATELY 350.0 HOURS AND WAS REMOVED FOR A BLACK BIM INDICATION. A NITROGEN LEAK WAS DETECTED BETWEEN BLADE POCKETS NR 24 AN
- [SDR 97ZZZX2477](https://openairdocs.org/sdr/97ZZZX2477), Mar 4, 1997: MAIN SHAFT. CRACKED. MGB MAIN SHAFT INSPECTION. TWO SPLINES FOUND CONTAINING ONE INDICATION EACH. INDICATIONS LOCATED ON THE LOAD SIDE OF THE SPLINE AND IN THE ROOT AREA. LENGTH OF 
- [SDR 96ZZZX5313](https://openairdocs.org/sdr/96ZZZX5313), Jan 26, 1996: TABLOCK. MISSING. TABLOCK FOUND MISSING AT HIDDEN DAMAGE INSPECTION CONDUCTED ON COMPRESSOR BEING PROCESSED INTO THE REPAIR STATION ON 1-26-96. THE LAST OVERHAUL WAS PERFORMED BY

## STCs that may be installed (OpenAirDocs) (31)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Sikorsky S-64F)

- [STC SR11923SE](https://openairdocs.org/stc/SR11923SE): Installation of Helicopter Transport Services, LLC Shock Absorber HTS-2000. Helicopter Transport Services LLC
- [STC SR11810SE](https://openairdocs.org/stc/SR11810SE): Installation of Helicopter Transport Services, LLC External Load Indicating System. Helicopter Transport Services LLC
- [STC SR04343CH](https://openairdocs.org/stc/SR04343CH): Installation of Heli-Preheat Kit, p/n TA3193-1 for 115 volt application in accordance with Heli-Preheat Kit drawing TA3193-1 Revision D, dated December 11, 2023 or later FAA approved revisions and Preheat Kit Installation Instruction TNH3193 Revision B, dated July 6, 2018 or later FAA approved revisions. HARTZELL PROPELLER LLC
- [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc
- [STC SR02766SE](https://openairdocs.org/stc/SR02766SE): Installation of a Supplemental Lighting System. Aviation Specialties Unlimited Inc
- [STC SR02717SE](https://openairdocs.org/stc/SR02717SE): Installation of Helicopter Transport Services Remote Fuel Sump System. Helicopter Transport Services LLC
- [STC SR02684SE](https://openairdocs.org/stc/SR02684SE): Installation of Helicopter Transport Services, LLC (HTS) lightweight firefighting refill pump. Helicopter Transport Services LLC
- [STC SR00925DE](https://openairdocs.org/stc/SR00925DE): Installation of Garmin GTX 335/335R and GTX345/345R transponders to provide ADS-B Out and In functionality. Peregrine
- [STC SR00004SE](https://openairdocs.org/stc/SR00004SE): Fabrication and installation of Erickson fire fighting system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR00815SE](https://openairdocs.org/stc/SR00815SE): Fabrication and installation of Erickson Model Sea Snorkel system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09574RC](https://openairdocs.org/stc/SR09574RC): Installation of Night Vision Goggle Compatible Lighting System. Aero Dynamix Inc
- [STC SR02055SE](https://openairdocs.org/stc/SR02055SE): Replacement tail rotor blades, Part Numbers 65161-00001-041MII and/or 65161-00001-043MII. Helicopter Transport Services LLC
- [STC SH5653NM](https://openairdocs.org/stc/SH5653NM): Re-mounting of the turbine engines and reinforcement of the associated fuselage support structure with Erickson detuned engine mounting system (DEMS). Erickson Incorporaated/dba Erickson Air-Crane
- [STC SR09415RC](https://openairdocs.org/stc/SR09415RC): Installation of Engine Monitoring System and Fuel Indication with multifunction displays (MFD-5200). Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5764NM](https://openairdocs.org/stc/SH5764NM): Increase in maximum ground idle speed. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR00026SE](https://openairdocs.org/stc/SR00026SE): Fabrication and Installation of Erickson external load dynamic shock absorber system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR01955NY-D](https://openairdocs.org/stc/SR01955NY-D): Installation of a Keystone Helicopter Anit-Rotational Restraint System. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR01611NY-D](https://openairdocs.org/stc/SR01611NY-D): Installation of a Keystone Helicopter cargo pod. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09411RC](https://openairdocs.org/stc/SR09411RC): Installation of Environmental Control System. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09412RC](https://openairdocs.org/stc/SR09412RC): Installation of Flight Display System. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09413RC](https://openairdocs.org/stc/SR09413RC): Installation of Automatic Flight Control System. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09414RC](https://openairdocs.org/stc/SR09414RC): Installation of Caution Advisory Panel. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR09416RC](https://openairdocs.org/stc/SR09416RC): Installation of Avionics System. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5974NM](https://openairdocs.org/stc/SH5974NM): Replacement of existing combustion type cockpit heater with an engine bleed air type heater system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH1618NM](https://openairdocs.org/stc/SH1618NM): Installation of externally mounted ferry tanks. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH3853NM](https://openairdocs.org/stc/SH3853NM): Modification of the Rotorcraft flight Manual. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5724NM](https://openairdocs.org/stc/SH5724NM): Use of Mobil Oil Corporation Mobilith SHC220 synthetic grease to lubricate selected components in place of the previously approved grease. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH581NW](https://openairdocs.org/stc/SH581NW): Installation of a hydraulic hand pump on the rotor brake system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR00502SE](https://openairdocs.org/stc/SR00502SE): Fabrication and installation of Erickson Model 10333-101 (S-64E) or 10333-103 (S-64F) Water/Foam Cannon system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH546NW](https://openairdocs.org/stc/SH546NW): Installation of an electronic weighting system (for monitoring cargo and/or hoist hook weight). Measurement Systems Intl
- [STC SH607NW](https://openairdocs.org/stc/SH607NW): Installation of mechanical release system for external cargo hook. McCallister Engineering Enterprises

## Related

- Other Sikorsky S-64F aircraft: https://openairdocs.org/model/sikorsky-s-64f/aircraft.md
- The Pratt & Whitney JFTD12A series engine: https://openairdocs.org/engine/pratt-whitney-jftd12a-series.md

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