Type Record · As of May 3, 2026
SIKORSKY S-58ET
Rotorcraft · P&W CANADA PT6T-6
Registered
3
Year Range
1956–1962
NTSB Events
2
Airworthiness Directives
0
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered SIKORSKY S-58ET aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- CA 66.7% 2
- TX 33.3% 1
By Decade of Manufacture
- 1950s 66.7% 2
- 1960s 33.3% 1
02 / NTSB Records
Events involving SIKORSKY S-58ET aircraft
2 event(s) on file. Showing the most recent 2.
-
Sep 11, 2019
N1168UAzusa, California
NTSB Docket → -
Apr 14, 1989
N1168USANTA ANA, California Minor
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to SIKORSKY S-58ET
No matching airworthiness directives are on file for this make and model in the Federal Register.
04 / Type Certificate Data Sheets
FAA TCDS for SIKORSKY S-58ET
The TCDS is the legal certification document — weight limits, performance, equipment, AD compliance times, operating limitations. 1 match in the FAA catalog.
- 1H11 Current Rev 18 · 12/29/1988
Sikorsky Aircraft Corporation
Models: S-58J, S-58FT, S-58C, S-58A + 11 more
06 / Supplemental Type Certificates
Modifications approved for SIKORSKY S-58ET
40 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
02/21/2023
STC SR04549AT
Conversion of the Pratt & Whitney PT6T-3 to the PT6T-3B configuration
Centerpointe Aerospace
-
11/17/2022
STC SR04549AT
Conversion of the Pratt & Whitney PT6T-3 to the PT6T-3B configuration per Pratt & Whitney Canada Service Bulletin No. PT6T-72-5252
Asia-Pacific Engineering Consulting Services
-
10/07/2021
STC SH5780NM
Fabrication of Onboard Systems model E-46 cargo hook load weigh system.
Onboard Systems International
-
12/17/2020
STC SR02704SE
Installation and maintenance of the Sunspot 36 and 46 series lights
AeroLED's Holdings LLC
-
12/17/2020
STC SR02704SE
Installation and maintenance of the Sunspot 36 and 46 series lights
AeroLEDS LLC
-
11/03/2020
STC SR04483CH
Installation of NASI NREM18M Air Conditioning Module
National Aircraft Service Inc. (NASI)
-
05/29/2019
STC SR00359BO
Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.
Whelen Aerospace Technologies
-
11/28/2016
STC SR00359BO
Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.
Whelen Engineering Co Inc
-
01/14/2015
STC SR02394AK
Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system
Seaplanes North LLC
-
03/19/2014
STC SR03310CH
Installation of NASI Air Conditioning Module
National Aircraft Service Inc
-
05/23/2012
STC SR02394AK
Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system
Floats Alaska LLC
-
03/15/2012
STC SR02394AK
Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system per Installation Instructions LED03-20R, Rev. IR, dated October 27, 2010.
Floats Alaska LLC
-
02/21/2012
STC SH3319NM
Installation of Precise Pulselite Control System
Precise Flight Inc
-
12/09/2009
STC SA2693NM (PAGE 2)
Installation of Electronics International digital volt/amp gauges and accessories.
Electronics International Inc.
-
11/07/2003
STC SH3319NM
Installation of Precise Pulselite Control Unit in the Landing/Taxi/Recognition Visual Control Light System.
Precise Flight Inc
-
12/03/2001
STC SH3319NM
Installation of Precise Pulselite Control Unit in the Landing/Taxi/Recognition Visual Control Light System.
Precise Flight Inc
-
12/03/1998
STC SR00968CH
Reduce take-off gross weight from 13,000 to 12,500 lbs. During passenger and internal cargo carrying operations. (S-58ET s/n 58-855)
Midwest Truxton International, Inc.
-
06/30/1994
STC SR00042SE
Modification to allow the use of Configuration II aircraft performance limits.
Glacier Helicopter Inc
-
04/22/1994
STC SR00042SE
Modification to allow the use of Configuration II aircraft performance limits.
Glacier Helicopter, Inc
-
03/09/1993
STC SA1626NM Page 2
Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series)
Electronics International
-
10/13/1992
STC SH5780NM
Fabrication of Onboard Systems model E-46 cargo hook load weigh system.
Onboard Systems
-
04/29/1991
STC SH2212NM
Installation of Silver Instruments Fueltron IIIPT-IGS, IIIPT-IPS, IIIPT-ILS, IIIPT-IKS digital fuel flow indicating system.
Arnav Systems Inc
-
08/02/1990
STC SH770NW
Installation of a weighing system.
Onboard Systems
-
11/29/1989
STC SH4570NM
Approval for takeoffs and landings up to and including 12,000 feet density altitude is authorized.
Air One Helicopters, Inc
-
10/13/1989
STC SA4302NM (PAGE 2)
Installation of Electronics Int'l digital automatic engine analyzer.
Electronics International
-
10/13/1989
STC SA4302NM (PAGE 1)
Installation of Electronics Int'l digital automatic engine analyzer.
Electronics International
-
05/26/1989
STC SH4539NM
Establish a nine passenger seat configuration.
Air One Helicopters, Inc
-
04/18/1989
STC SH1010GL
Reduction of standard passenger seating from sixteen to nine seats or less.
Brainerd Helicopters, Inc
-
09/22/1988
STC SH4507NM
Approval for takeoffs and landings up to and including 12,000 feet densiy altitude is authorized.
Los Angeles County Sheriff's Department Aero Bureau
-
09/19/1988
STC SH464NE
Installation of an Alternate Float Bottle System.
California Helicopter International
+ 10 more STCs on file
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for SIKORSKY S-58ET
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 3 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →