# N173AC: 1967 Sikorsky S-64E

- Status: Valid registration
- Airframe: [Sikorsky S-64E](https://openairdocs.org/model/sikorsky-s-64e) (registry code 8142604, 3 seats)
- Engine: [Pratt & Whitney JFTD12A-4A](https://openairdocs.org/engine/pratt-whitney-jftd12a-4a) (registry code 51502)
- 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: 64015
- Year built: 1967
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, transport
- Airworthiness date: June 26, 2013
- Certificate issued: May 2, 2024
- Expires: May 31, 2031
- Mode S code: A12455
- 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=173AC
- Page: https://openairdocs.org/aircraft/N173AC

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): 9 in force

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

- [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 85-25-03](https://openairdocs.org/ad/85-25-03): Torque Tube Inner Bracket Assembly · Erickson Air-Crane S-64E. Effective Dec 30, 1985
- [AD 85-18-01](https://openairdocs.org/ad/85-18-01): Main Rotor Blade Outboard Spars · Erickson Air-Crane S-64E. Effective Sep 12, 1985
- [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
- [AD 74-16-05](https://openairdocs.org/ad/74-16-05): Main Rotor Head Spindle Lock Nut · Erickson Air-Crane S-64A and S-64E. Effective Dec 12, 1974

### Matched by engine (Pratt & Whitney JFTD12A-4A)

- [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 97-19-10](https://openairdocs.org/ad/97-19-10) (historical): Main Transmission Plates Inspection · Erickson Air-Crane S-64E. Effective Oct 17, 1997
- [AD 90-26-12](https://openairdocs.org/ad/90-26-12) (historical): Main Rotor Blades · Erickson Air-Crane S-64E. Effective Jan 18, 1991
- [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) (1 in force)

- [SAIB SW-07-21](https://openairdocs.org/saib/SW-07-21): Tail Rotor Head Assembly. Issued Mar 21, 2007

## NTSB investigations (1)

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 WPR19WA147](https://openairdocs.org/ntsb/WPR19WA147), Jan 28, 2019: Sikorsky S64 (N173AC), Mount Eliza, Australia, substantial damage

## 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 20020207002059I](https://openairdocs.org/incident/20020207002059I), Feb 7, 2002: Skrsky S64E (N173AC), Applegate, OR. (-23) This aircraft was engaged in logging operations, by erickson air crane, inc., E8KL, near Applegate lake in southwest Oregon. The PIC made a precautionary…

## Service difficulty reports (5)

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 JYDR20260203027](https://openairdocs.org/sdr/JYDR20260203027), Feb 3, 2026: PISTON ROD. BROKEN. AIRCRAFT HAD JUST SHUT DOWN FOR A 3HR BIM INSPECTION. (REQUIRED AD) MAINTENANCE PERSONAL NOTICED A DAMPER ASSEMBLY BROKEN AT THE ATTACHMENT TO THE HORIZONTAL HI
- [SDR 2005FA0000817](https://openairdocs.org/sdr/2005FA0000817), Feb 14, 2005: THRUST WASHER. WORN. MAIN GEAR BOX, SN A6051 REMOVED FOR BRASS CONTAMINATION. UPON DISASSEMBLY DISCOVERED BRASS MATERIAL WAS FROM SECOND STAGE PLANETARY THRUST WASHERS. 34 OUT OF 36
- [SDR MDR03021](https://openairdocs.org/sdr/MDR03021), Nov 20, 2003: HOUSING. CRACKED. THE TGB CENTER HOUSING WAS FOUND CRACKED WHILE INSTALLED ON AIRCRAFT. IT WAS REMOVED PREMATURELY, HAVING TSO 89.0 HOURS. THE SHOP DETECTED THE CRACK VISUALLY. T
- [SDR 2003FA0000138](https://openairdocs.org/sdr/2003FA0000138), Jan 27, 2003: BLADE. DAMAGED. ONE OF THE TWO TRAILING EDGE STUDS THAT WAS HOLDING THE TIP END WEIGHT PACKAGE FRACTURED (TRAIL EDGE). THE FRACTURE OCCURED APPROX. 1/4 INCH BELOW THE LOCK RING
- [SDR MDR02011](https://openairdocs.org/sdr/MDR02011), Sep 30, 2002: TIP CAP. BROKEN. TRAILING EDGE TIP WEIGHTS (UP TO 5 EA) AND ATTACHMENT BOLT (1 EA) DEPARTED FROM TIP RIB ASSEMBLY AND WENT THROUGH TIP CAP. DURING THE POCKET REPLACEMENT PROCESS

## STCs that may be installed (OpenAirDocs) (48)

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-64E)

- [STC SR02807SE](https://openairdocs.org/stc/SR02807SE): Installation of a Fly Away Tool box. Helicopter Transport Services LLC
- [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 SR02777SE](https://openairdocs.org/stc/SR02777SE): Installation of a Load Beam. Helicopter Transport Services 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 SR02754SE](https://openairdocs.org/stc/SR02754SE): Installation of External Cargo Container. Helicopter Transport Services, LLC
- [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 SR02503SE](https://openairdocs.org/stc/SR02503SE): Installation of Additional Telemetry Unit (ATU). Helicopter Transport Services LLC
- [STC SR01192LA](https://openairdocs.org/stc/SR01192LA): Installation of a 2,000 gallon RADS11-200 Helitank Fire Retardant System. United Aeronautical Corporation
- [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 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 SR01612NY-D](https://openairdocs.org/stc/SR01612NY-D): Installation of a Keystone Helicopter Cargo Pod. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SR00913SE](https://openairdocs.org/stc/SR00913SE): Installation of bubble window in pilot and co-pilot doors in accordance with Section D of Erickson Air-Crane (EAC) Report No. 1310, dated May 7, 2001, or later FAA approved revision; and removal of the tail pylon fairing and main landing gear fairings in accordance with EAC Maintenance Instructions No. RS-052 and RS-053, respectively, each dated May 10, 2001, or later FAA approved revision. Approved for serial number 64018 ONLY. 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 SH2907NM](https://openairdocs.org/stc/SH2907NM): Replacement of the existing combustion type cockpit heater with an engine bleed air type heater system on Erickson Model S-64E rotorcraft. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH2908NM](https://openairdocs.org/stc/SH2908NM): Modification of the external loads lifting pendant and system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH2910NM](https://openairdocs.org/stc/SH2910NM): Installation of Erickson EAC-4675 tail pipe extension. 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 SH4746NM](https://openairdocs.org/stc/SH4746NM): Use of Mobil Oil Corp. 'Mobilgrease 28' synthetic grease to lubricate the main rotor head, swash plate and various associated linkages. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5166NM](https://openairdocs.org/stc/SH5166NM): Re-mounting of the turbine engines and reinforcement of the associated fuselage support structure with Erickson detuned engine mouting system (DEMS). 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 SH5776NM](https://openairdocs.org/stc/SH5776NM): Installation of a tail pipe extension. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH579NW](https://openairdocs.org/stc/SH579NW): Install Vickers hoist pump, APU starter motor and handpump for rotor brake system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH580NW](https://openairdocs.org/stc/SH580NW): Install Vickers hoist pump, APU starter motor and handpump for rotor brake system. 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 SH726NW](https://openairdocs.org/stc/SH726NW): Installation of Erickson EAC-4675 tail pipe extension. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH738NW](https://openairdocs.org/stc/SH738NW): Installation of Erickson EAC-4675 tail pipe extension. 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 SH264WE](https://openairdocs.org/stc/SH264WE): Installation of Aero-Craft Hydrulics, Inc, Auxiliary power unit (APU) starter motor P/N ACH-3911-205SPCL. Aero-Craft Hydraulics, Inc
- [STC SR00477SE](https://openairdocs.org/stc/SR00477SE): Installation of Erickson Model 10333-101 water/foam cannon system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5692NM](https://openairdocs.org/stc/SH5692NM): Installation of fire fighting system manufactured and installed. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5733NM](https://openairdocs.org/stc/SH5733NM): Installation of fire fighting system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH5102NM](https://openairdocs.org/stc/SH5102NM): Modification to disarm the external load jettison system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH4756NM](https://openairdocs.org/stc/SH4756NM): Use of Mobil Oil Corp. SHC 626 synthetic oil in the main, intermediate and tail gearboxes. 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 SH263WE](https://openairdocs.org/stc/SH263WE): Installation of hoist pump(yoke type), P/N ACH60552L6. Aero Craft Hydraulics Inc
- [STC SH606NW](https://openairdocs.org/stc/SH606NW): Install AiResearch motor driven fan for transmission cooling system. Erickson Air Crane Inc. dba Erickson Air-Crane
- [STC SH607NW](https://openairdocs.org/stc/SH607NW): Installation of mechanical release system for external cargo hook. McCallister Engineering Enterprises

## Related

- Other Sikorsky S-64E aircraft: https://openairdocs.org/model/sikorsky-s-64e/aircraft.md
- The Pratt & Whitney JFTD12A-4A engine: https://openairdocs.org/engine/pratt-whitney-jftd12a-4a.md

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