# Sikorsky S-55 - Type: Aircraft model (FAA registry) - Registry code: 8141602 - Manufacturer (registry): SIKORSKY - Model: S-55 - Aircraft type: Rotorcraft - Category: Rotorcraft - Engines: 1 · Turbo-shaft - Seats: 12 - Weight class: Up to 12,499 lb - Cruise speed: 85 mph - Certification: Type certificated - Data sheet: [TCDS 1H4](https://openairdocs.org/tcds/1H4) (OpenAirDocs) - Holder: Centerpointe Aerospace Inc. - Registered aircraft: 3 - Page: https://openairdocs.org/model/sikorsky-s-55 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 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 71-26-03](https://openairdocs.org/ad/71-26-03): Servo Support Bracket · Sikorsky S-55 and S62A. Effective Dec 30, 1971 - [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 ## Registered aircraft (3) - [N111VA](https://openairdocs.org/aircraft/N111VA): [Weeks Kermit A](https://openairdocs.org/faa-owner/WEEKS%20KERMIT%20A), [Polk City, FL](https://openairdocs.org/faa-place/FL/Polk%20City), built 1953, S/N 55433 - [N2300Z](https://openairdocs.org/aircraft/N2300Z): [Provost Michael A](https://openairdocs.org/faa-owner/PROVOST%20MICHAEL%20A), [Jefferson, GA](https://openairdocs.org/faa-place/GA/Jefferson), built 1954, S/N 55750 - [N752A](https://openairdocs.org/aircraft/N752A): [Sierra Aeronautics LLC](https://openairdocs.org/faa-owner/SIERRA%20AERONAUTICS%20LLC), [Franklin, KY](https://openairdocs.org/faa-place/KY/Franklin), built 1957, S/N 55981 ## NTSB investigations (8) 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 LAX06LA280](https://openairdocs.org/ntsb/LAX06LA280), Aug 26, 2006: Sikorsky S-55 (N111VA), Paramount, CA, substantial damage. Probable cause: the loss of engine power for undetermined reasons. A factor was the unsuitable terrain for the landing. - [NTSB LAX02TA267](https://openairdocs.org/ntsb/LAX02TA267), Aug 30, 2002: Sikorsky S-55T (N747A), Lytle Creek, CA, substantial damage. Probable cause: Failure of the hydraulic system due to contamination in the hydraulic fluid, which resulted in an in-flight loss of control. - [NTSB ATL02LA130](https://openairdocs.org/ntsb/ATL02LA130), Jun 25, 2002: Sikorsky S-55-QT (N2300Z), Orlando, FL, substantial damage. Probable cause: Failure of the cyclic lateral control rod end bearing, and subsequent dynamic rollover. - [NTSB LAX81FA093](https://openairdocs.org/ntsb/LAX81FA093), May 29, 1981: Sikorsky S-55 (N874), Beaumont, CA, destroyed, 6 fatal - [NTSB FTW75DRD18](https://openairdocs.org/ntsb/FTW75DRD18), Dec 2, 1974: Sikorsky S-55 (N750A), Gulf Of Mexico (Gulf of Mexico), substantial damage - [NTSB NYC72FNA14](https://openairdocs.org/ntsb/NYC72FNA14), Oct 15, 1971: Sikorsky S-55 (N9009R), Acton, MA, destroyed - [NTSB ANC67A0021](https://openairdocs.org/ntsb/ANC67A0021), Aug 20, 1966: Sikorsky S-55 (N747A), Galena, AK, substantial damage - [NTSB ANC66A0052](https://openairdocs.org/ntsb/ANC66A0052), Jun 29, 1966: Sikorsky S55 (N874), Kenai, AK, substantial damage ## FAA accident and incident reports (6) 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 20060827019199A](https://openairdocs.org/incident/20060827019199A), Aug 27, 2006: Skrsky S55 (N111VA), Paramount, CA, Substantial damage. (-23) The pilot stated in a telephone interview that approximately five to six minutes after departing compton airport, he attempted to lean the engine… - [Accident 20020830022079A](https://openairdocs.org/incident/20020830022079A), Aug 30, 2002: Skrsky S55 (N747A), Lytle Creek, CA, Substantial damage. (.19) On August 30, 2002, at 1006 hours pacific daylight time, a Sikorsky S-55T, N747A, collided with terrain while attempting a precautionary landing in a dry… - [Accident 20020625015499A](https://openairdocs.org/incident/20020625015499A), Jun 25, 2002: Skrsky S55 (N2300Z), Orlando, FL, No damage. (-23) On the ground, while in the process of engaging the hydrometrical clutch at approximately 110 rotor RPM, there was a loud bang. The cyclic stick was… - [Incident 19870610080779I](https://openairdocs.org/incident/19870610080779I), Jun 10, 1987: Skrsky S55 (N747A), Cold Springs, CA, Minor damage. Needles split at idle. The clutch reengaged tearing up gear box. Shut down engine. Possible faulty main drive clutch. - [Accident 19810529030949A](https://openairdocs.org/incident/19810529030949A), May 29, 1981: Skrsky S55 (N874), Banning, CA, Destroyed, 5 fatal. Struck top of hill obscured by night and fog. Not IFR helicopter rated. Failed to check weather. Had drunk alcohol. - [Accident 19741202038319A](https://openairdocs.org/incident/19741202038319A), Dec 2, 1974: Skrsky S55 (N750A), Gulf Of Mexico, LA, Substantial damage. Nr 5 eng cylndr exhst rkr bx crckd. Emerg lndg made on bcksd of wave in 8 to 10 ft sea. Float equip. ## Service difficulty reports (3) As reported by operators and repair stations, by the model named in the report. - [SDR 2011FA0000779](https://openairdocs.org/sdr/2011FA0000779), Jun 26, 2011: FUEL. INADEQUATE. WHILE DEMONSTRATING EXTERNAL LOAD CAPABILITY DIRECTLY ABOVE A JUNGLE HELIPAD, THE ENGINE BEGAN TO LOOSE RPM AND THE ACFT LANDED BACK ON THE PAD. THE LANDING WAS - [SDR 20000615SH003](https://openairdocs.org/sdr/20000615SH003), May 11, 2000: TAIL BOOM. CRACKED. UPPER TAIL CONE SKIN AT STA 181.9 CRACKED APPROXIMATELY 12 INCHES IN LENGTH. (X) - [SDR 20000407SH005](https://openairdocs.org/sdr/20000407SH005), Feb 26, 2000: BLADE. CRACKED. ITEM CRACKED AT ROOT ATTACH POINT OF TAIL ROTOR BLADE. REMOVED TAIL ROTOR BLADE FROM ASSY AND DISCOVERED TAIL ROTOR BLADE ATTACH BOLTS WERE NOT TORQUED TO MANUF ## STCs that may be installed (OpenAirDocs) (27) 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 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 SA4-181](https://openairdocs.org/stc/SA4-181): Installation of VIP Part No. 101-79 engine mounts. FTG, 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 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 SR09229RC](https://openairdocs.org/stc/SR09229RC): Installation approval of a 5 blade main rotor system and the Air Research TSE331-10UA-511SW engine. Whisper Jet Inc - [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 SR01034AT](https://openairdocs.org/stc/SR01034AT): Installation of forward and aft facing seats and cabin interior. Whisper Jet, Inc - [STC SR01274AT](https://openairdocs.org/stc/SR01274AT): Installation of cabin doors and windows. Whisper Jet, Inc - [STC SH127WE](https://openairdocs.org/stc/SH127WE): Installation of AiResearch TSE-331-3U-303N engine and related changes. Whisper Jet Inc - [STC SR09190RC](https://openairdocs.org/stc/SR09190RC): Installation of a National Flight Services TSE331-10UA-511SW turbine conversion. Orlando Aviation, 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 SH150WE](https://openairdocs.org/stc/SH150WE): Installation of Chadwick electronic weighing system C-46. Onboard Systems - [STC SH4-181](https://openairdocs.org/stc/SH4-181): Installation of VIP P/N 101-79 mounts. Vibration Isolation Products Corp - [STC SH1775SO](https://openairdocs.org/stc/SH1775SO): Installation of Wright R-1300-3 engine. Orlando Heli Airways Inc - [STC SH1599SO](https://openairdocs.org/stc/SH1599SO): Removal of main transmission oil cooler blower and associated parts. Orlando Heli Airways Inc - [STC SH1523SO](https://openairdocs.org/stc/SH1523SO): Add approved fuels: unleaded automotive gasoline 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index (RON & MON)/2. Intermixing with aviation gasoline also approved. Orlando Heli Airways Inc - [STC SH449NW](https://openairdocs.org/stc/SH449NW): Installation of an electronic weighing system (for monitoring cargo weight). Measurement Systems Intl - [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 SH71EA](https://openairdocs.org/stc/SH71EA): South Wind heater 8259-A. Laboratory for Electronics Inc ## PMA parts (OpenAirDocs) (23) 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. - [01-0790906-00](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID127923622920220610124328.0001): LED Landing Light. Whelen Aerospace Technologies · PMA PQ1372CE · Modification part · Jun 6, 2022 - [13889](https://drs.faa.gov/browse/excelExternalWindow/9938C07A63991E4A86257FC5006D9DAC.0001): CONE. Timken Corporation · PMA PQ4105CE · Replaces 13889 · May 24, 2016 - [13889](https://drs.faa.gov/browse/excelExternalWindow/1557075F169B593686257D2A00574562.0001): CONE. Timken Corporation · PMA PQ4105CE · Replaces 13889 · Jun 29, 2014 - [P1615-20136-4](https://drs.faa.gov/browse/excelExternalWindow/F813EB6F04D81ACB862577A4006412E0.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20136-4 · Apr 26, 2010 - [P1615-20135-1](https://drs.faa.gov/browse/excelExternalWindow/C40B037E07550392862577A400641232.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20135-1 · Apr 26, 2010 - [P1615-20136-3](https://drs.faa.gov/browse/excelExternalWindow/651BF179F972BB5F862577A4006412B6.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20136-3 · Apr 26, 2010 - [P1615-20136-2](https://drs.faa.gov/browse/excelExternalWindow/42762FAE82ED2111862577A40064128F.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20136-2 · Apr 26, 2010 - [P1615-20134-1](https://drs.faa.gov/browse/excelExternalWindow/15E95BD8DF838954862577A4006411F6.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20134-1 · Apr 26, 2010 - [P1615-20136-1](https://drs.faa.gov/browse/excelExternalWindow/0BDECB9CB1AE4860862577A40064125E.0001): Pocket Assembly. Master Support Inc · PMA PQ1723CE · Replaces S1615-20136-1 · Apr 26, 2010 - [VIP 101-79](https://drs.faa.gov/browse/excelExternalWindow/DD2B7462927B06F3852570500056B23F.0001): Mount, Engine. Vibration Isolation Products · Replaces MB 100879 · Jun 11, 2003 - [32833](https://drs.faa.gov/browse/excelExternalWindow/6F67FEBEC7142B3885257045005D15B2.0001): Hat Section Track Cover. Ludlum Products Company · Modification part · Oct 14, 2002 - [33194](https://drs.faa.gov/browse/excelExternalWindow/611912EBBBC8DCE985257045005D15B3.0001): Seat Track Filler. Ludlum Products Company · Modification part · Oct 14, 2002 - [BH-1030-24-100CS](https://drs.faa.gov/browse/excelExternalWindow/81044746574A52338525704A005B1F93.0001): Inverter. Phoenix Aerospace Inc · Modification part · May 3, 2001 - [200-026-00](https://drs.faa.gov/browse/excelExternalWindow/8EB317EB3420431885257046005D69FA.0001): Weigh System. Onboard Systems · Modification part · Dec 8, 1999 - [13830](https://drs.faa.gov/browse/excelExternalWindow/717B3D7ECB905EB38525704C005B123C.0001): Cup. Timken Company The · Replaces 13830 · Nov 4, 1999 - [13889](https://drs.faa.gov/browse/excelExternalWindow/514654086521F68C8525704C005B123E.0001): Cone. Timken Company The · Replaces 13889 · Nov 4, 1999 - [BH-1030-24-100CS](https://drs.faa.gov/browse/excelExternalWindow/973DADA4B69AAE988525704A005B1F94.0001): Inverter. Phoenix Aerospace Inc · Modification part · Apr 19, 1998 - [SI-150-14](https://drs.faa.gov/browse/excelExternalWindow/97229C9020013A2E85257049005A8B26.0001): Weighing system Installation. Measurement Systems International · Modification part · Jul 18, 1996 - [A-058-000](https://drs.faa.gov/browse/excelExternalWindow/29F62B1708E1838C85257038006A789F.0001): Compass Glass. Aero Fabricators Inc · Modification part · Oct 3, 1995 - [RG9790](https://drs.faa.gov/browse/excelExternalWindow/F5D0B4DE1A85A44A85257046005A5091.0001): Electric Driven Fuel Pump. Lear Romec Division Crane Co · Replaces Lear Romec RG9790 · May 3, 1994 - [155-008-00](https://drs.faa.gov/browse/excelExternalWindow/72C26C43663FB5D585257046005B6FF7.0001): Model H-46 Cargo Hook Load Cell System. Onboard Systems · Modification part · May 23, 1991 - [82-01445-000](https://drs.faa.gov/browse/excelExternalWindow/8764373C40B23C06852570460060DAFD.0001): MAC 1700 Modification, Transceiver. McCoy Avionics Corp · Modification part · Mar 6, 1991 - [82-FSMOD-000](https://drs.faa.gov/browse/excelExternalWindow/3A7E349363C65253852570460060DAFE.0001): MAC 170A Modification, Transceiver. McCoy Avionics Corp · Modification part · Mar 6, 1991 ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [Sikorsky/Orlando S-55](https://openairdocs.org/model/sikorsky-orlando-s-55): 1 registered aircraft, registry code 8141605 - [Sikorsky/Vertical S-55](https://openairdocs.org/model/sikorsky-vertical-s-55): 1 registered aircraft, registry code 8141824 - [Sikorsky/Whisper Jet S-55](https://openairdocs.org/model/sikorsky-whisper-jet-s-55): 0 registered aircraft, registry code 8141601 --- 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.