# N616Z: 1957 Sikorsky S55B

- Status: Valid registration
- Airframe: [Sikorsky S55B](https://openairdocs.org/model/sikorsky-s55b) (registry code 8141603, 12 seats)
- Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (Centerpointe Aerospace Inc.) (OpenAirDocs)
- Serial number: 57-1616
- Year built: 1957
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness date: November 26, 1980
- Certificate issued: September 21, 2021
- Expires: September 30, 2028
- Mode S code: A80747
- Registered owner: [Sierra Aeronautics LLC](https://openairdocs.org/faa-owner/SIERRA%20AERONAUTICS%20LLC)
- Location: [Franklin, KY](https://openairdocs.org/faa-place/KY/Franklin)
- Owner type: LLC
- Owner's area on the map: 36.7254° N, 86.5646° W: Placed by OpenAirDocs at the center of ZIP code 42134, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=616Z
- Page: https://openairdocs.org/aircraft/N616Z

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): 19 in force

### Matched by airframe (Sikorsky S55B)

- [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 66-04-03](https://openairdocs.org/ad/66-04-03): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 3 more. Effective Apr 27, 1976
- [AD 75-22-12](https://openairdocs.org/ad/75-22-12): Inflight Power Loss · Sikorsky S-55, S-55B and S-55C with STC SH125WE or SH127WE. Effective Oct 31, 1975
- [AD 75-04-02](https://openairdocs.org/ad/75-04-02): Main Rotor Spindles · Orlando Helicopter Airways CH-19E, H-19A, H-19D and 8 more. Effective Feb 19, 1975
- [AD 73-16-01](https://openairdocs.org/ad/73-16-01): Engine Turbine Failure · Sikorsky S-55, S-55B and S-55C with STC SH127WE. Effective Jul 31, 1973
- [AD 70-12-04](https://openairdocs.org/ad/70-12-04): Main Rotor Shaft Cracks · Sikorsky S-55, S-55B, S-55C and 1 more. Effective Jun 17, 1970
- [AD 67-29-07](https://openairdocs.org/ad/67-29-07): Azimuth Control Rod Assembly · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective Nov 3, 1967
- [AD 67-17-06](https://openairdocs.org/ad/67-17-06): Pylon Lower Ring · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective May 21, 1967
- [AD 65-08-02](https://openairdocs.org/ad/65-08-02): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 11 more. Effective Apr 9, 1965
- [AD 63-05-02](https://openairdocs.org/ad/63-05-02): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more. Effective Mar 6, 1963
- [AD 60-13-04](https://openairdocs.org/ad/60-13-04): Rotor Shank Rod · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-51 and 3 more
- [AD 56-23-03](https://openairdocs.org/ad/56-23-03): Horizontal Hinge Pin Assembly · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 56-16-03](https://openairdocs.org/ad/56-16-03): Main Rotor Blade Inspection · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-51 and 3 more
- [AD 55-25-04](https://openairdocs.org/ad/55-25-04): Tail Cone Skin Reinforcements · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 54-20-02](https://openairdocs.org/ad/54-20-02): Support Assembly Cracks · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 54-19-02](https://openairdocs.org/ad/54-19-02): Servo Safety Clip · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 54-16-01](https://openairdocs.org/ad/54-16-01): Main Transmission · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 54-13-01](https://openairdocs.org/ad/54-13-01): Star Assembly Bolt Replacement · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more
- [AD 54-01-03](https://openairdocs.org/ad/54-01-03): Fuel Strainer Screen · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 2 more

### 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

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N616Z.

## FAA accident and incident reports

None matched to N616Z.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (18)

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 S55B)

- [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 SR02704SE](https://openairdocs.org/stc/SR02704SE): Installation and maintenance of the Sunspot 36 and 46 series lights. AeroLED's Holdings LLC
- [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation
- [STC SR00359BO](https://openairdocs.org/stc/SR00359BO): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies
- [STC SA01282NY](https://openairdocs.org/stc/SA01282NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830. Airwolf Filter Corporation
- [STC SR02562CH](https://openairdocs.org/stc/SR02562CH): Installation of C&D Associates Combustion Heater Kit 28 (P/N CD14190K28). Hartzell Engine Technologies, LLC
- [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc
- [STC SH51WE](https://openairdocs.org/stc/SH51WE): Installation of George M. Adams Model DGA-2000 wheel assembly. Skybound Manufacturing Inc
- [STC SH127WE](https://openairdocs.org/stc/SH127WE): Installation of AiResearch TSE-331-3U-303N engine and related changes. Whisper Jet Inc
- [STC SR09041RC](https://openairdocs.org/stc/SR09041RC): Installation of a fuselage left cabin door. Federico Helicopters Inc
- [STC SA1626NM PAGE 2](https://openairdocs.org/stc/SA1626NM%20PAGE%202): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SH770NW](https://openairdocs.org/stc/SH770NW): Installation of a weighing system. Onboard Systems
- [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. Electronics International
- [STC SH1599SO](https://openairdocs.org/stc/SH1599SO): Removal of main transmission oil cooler blower and associated parts. Orlando Heli Airways Inc
- [STC SH271WE](https://openairdocs.org/stc/SH271WE): Installation of cabin-mounted spray tank and external spray booms for agricultural purposes. Helitec Corporation
- [STC SH1072SO](https://openairdocs.org/stc/SH1072SO): Installation of dust boot retainer rings (in rotor head dampers). Orlando Heli Airways Inc
- [STC SH125WE](https://openairdocs.org/stc/SH125WE): Installation of AiResearch TSE-331-3U-303N engine and related changes. (Limited to serial number 55607). Aviation Specialties, Inc

## Earlier aircraft with N616Z

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N616Z before.

- [Cancelled 1970-06-26](https://openairdocs.org/deregistered/N616Z-1970-06-26): Curtiss Wright C-46, S/N 22590. Owner: [Zantop Air Transport Inc](https://openairdocs.org/faa-owner/ZANTOP%20AIR%20TRANSPORT%20INC), [Inkster, MI](https://openairdocs.org/faa-place/MI/Inkster)

## Related

- Other Sikorsky S55B aircraft: https://openairdocs.org/model/sikorsky-s55b/aircraft.md

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