Keystone Helicopter S-76C airworthiness directives

Manufacturer (registry): KEYSTONE HELICOPTER CORP · KEYSTONE HELICOPTER
Model: S-76C
Registry codes: 4900105, 4900103
Registered: 23 aircraft
Type: Rotorcraft
Engines: 2 · Turbo-shaft
Seats: 19
Weight class: Up to 12,499 lb
Certification: Type certificated
Data sheet: TCDSH1NE
Holder: Sikorsky Aircraft Corporation

Model codes come from the FAA registry’s reference file. ADs are matched to them by model name and maker. The FAA lists this model under more than one registry code, usually for different spellings of the maker. This page covers them all.

On this page

Aircraft by year built · 76

2006Registered nowDeregistered2026

Aircraft by the year they were built: 76 aircraft
2006	3
2007	6
2008	20
2009	32
2010	15

Airworthiness directives that may apply · 33

ADs whose products match this airframe model. Each AD’s applicability may narrow it by serial number, part number or configuration.

1999In forceSuperseded2026

ADs by the year they took effect: 38 ADs
1999	4
2000	1
2001	4
2002	3
2003	2
2004	1
2005	1
2006	1
2007	1
2010	4
2011	1
2012	1
2013	2
2014	1
2015	2
2016	1
2018	2
2019	1
2020	1
2021	1
2022	1
2023	1
2024	1

Airframe · Keystone Helicopter S-76C

AD 2024-20-07Emergency Equipment; Emergency Flotation SectionEffective Dec 5, 2024 AD 2023-11-07Ground Proximity SystemEffective Jun 22, 2023 · Supersedes AD 2021-23-13 AD 2022-05-10Cabin Equipment/FurnishingsEffective Apr 20, 2022

See all 40 ADs

Query with SQL

duckdb -csv -c "SELECT d.ad_number, d.status, d.subject, d.effective_date
  FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
  WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_directive.parquet' WHERE aircraft_model_code IN ('4900105', '4900103'))
  ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT d.ad_number, d.status, d.subject, d.effective_date
FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_directive.parquet' WHERE aircraft_model_code IN ('4900105', '4900103'))
ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

Information bulletins that may apply · 2

Airframe · Keystone Helicopter S-76C

SAIB AIR-20-11Attitude and Direction Data System, Incorrect AHRS Yaw Rate OutputIssued Jun 22, 2020 SAIB SW-08-37Inoperative Cyclic Control Stick GuardIssued Jul 22, 2008

Query with SQL

duckdb -csv -c "SELECT s.saib_number, any_value(s.title) AS title, max(s.issue_date) AS issue_date, any_value(s.status) AS status
  FROM 'https://openairdocs.org/data/latest/faa_saib.parquet' s
  WHERE s.saib_id IN (SELECT saib_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_saib.parquet' WHERE aircraft_model_code IN ('4900105', '4900103'))
  GROUP BY s.saib_number ORDER BY issue_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT s.saib_number, any_value(s.title) AS title, max(s.issue_date) AS issue_date, any_value(s.status) AS status
FROM 'https://openairdocs.org/data/latest/faa_saib.parquet' s
WHERE s.saib_id IN (SELECT saib_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_saib.parquet' WHERE aircraft_model_code IN ('4900105', '4900103'))
GROUP BY s.saib_number ORDER BY issue_date DESC

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

Registered aircraft · 23

N152AEMustang Leasing LLC · Henderson, NVBuilt 2008 · S/N 760714 N176FXFlexjet Vertical Lift LLC · Stratford, CTBuilt 2007 · S/N 760646 N2119AArrow Aviation Co LLC · Broussard, LAS/N 760640

See all 23 registered aircraft

Query with SQL

duckdb -csv -c "SELECT n_number, serial_number, year_manufactured, status, registrant_name, registrant_city, registrant_state
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet'
  WHERE aircraft_model_code IN ('4900105', '4900103')
  ORDER BY n_number"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT n_number, serial_number, year_manufactured, status, registrant_name, registrant_city, registrant_state
FROM 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet'
WHERE aircraft_model_code IN ('4900105', '4900103')
ORDER BY n_number

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

NTSB investigations

No NTSB investigations matched to aircraft with this modelMatched through the registry by N-number, so foreign aircraft and some older cases aren’t counted.

FAA incident reports · 1

Matched to this model through the registry, by N-number and event date, checked against the reported make and model.

Incident 20241113016729IKeystone Helicopter S-76C · Galliano, LAA video of the incident showed the helicopter in a hover, with all three-landing gear down, before landing on the helipad at the south lafourche airport (kgao). Shortly after landing, the left main landing gear collapsed, causing the left side of the airframe…Nov 13, 2024 · N787RL · Minor damage

Query with SQL

duckdb -csv -c "SELECT report_number, event_date, event_type, city, state, aircraft_make, aircraft_model, aircraft_damage, fatal_injuries, n_number
  FROM 'https://openairdocs.org/data/latest/faa_incident_report.parquet'
  WHERE aircraft_model_code IN ('4900105', '4900103')
  ORDER BY event_date DESC, report_number DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT report_number, event_date, event_type, city, state, aircraft_make, aircraft_model, aircraft_damage, fatal_injuries, n_number
FROM 'https://openairdocs.org/data/latest/faa_incident_report.parquet'
WHERE aircraft_model_code IN ('4900105', '4900103')
ORDER BY event_date DESC, report_number DESC

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

Service difficulty reports · 717

SDR 2026FA0000301Indication Sys · false indicationRDAU DISPLAYS FAULTY FUEL INDICATIONS. AFTER START-UP #1 FUEL QUANTITY DROPS APPROX. 100 LBS. THEN RISES THE SAME AFTER SHUTDOWN.Apr 24, 2026 · N781RL · Skrsky S76C · Fuel Quantity Indicator SDR HEEA202601020001Brace · inoperativeON CLIMB OUT FROM KGLS, RIGHT SIDE LANDING GEAR WOULD NOT RETRACT.Jan 1, 2026 · N745P · Skrsky S76C · Main Landing Gear SDR HEEA202509050001Transducer · inoperativeNUMBER ONE ENGINE BARRIER FILTER MAINTENANCE CAUTION CAME ON IN FLIGHT RETURNED TO HOUMA. ALL OTHER ENGINE INDICATIONS NORMAL.Sep 3, 2025 · N725P · Skrsky S76C · Engine Bleed Air System

See all 717 difficulty reports

Query with SQL

duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE aircraft_model_key = 'S76C'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE aircraft_model_key = 'S76C'
ORDER BY difficulty_date DESC

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

STCs that may be installed · 352

Approved for this model: the STC’s model list names it on its data sheet, or a series that includes it. The registry doesn’t record which STCs an aircraft has.

STC SR12301IBInstallation of Nginuity DAQ9000 as an alternate Flight Data Acquisition Unit (FDAU)365 AEROSPACE DDS LIMITED STC SR04465NYInstallation of the iPad MountAvio Design Group Inc STC SR02727SEInstallation and maintenance of the Sunspot 36 and 46 series lightsWhelen Aerospace Technologies

See all 352 STCs

Query with SQL

SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model FROM ( SELECT stc_number, min(matched_model) AS matched_model FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet' WHERE aircraft_model_code IN ('4900105', '4900103') GROUP BY stc_number ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number) ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number

duckdb -csv -c "SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model
  FROM (
    SELECT stc_number, min(matched_model) AS matched_model
    FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet'
    WHERE aircraft_model_code IN ('4900105', '4900103')
    GROUP BY stc_number
  ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number)
  ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model
FROM (
  SELECT stc_number, min(matched_model) AS matched_model
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet'
  WHERE aircraft_model_code IN ('4900105', '4900103')
  GROUP BY stc_number
) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number)
ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

Sikorsky S-76C78 registered aircraftRegistry code 8143008

Query with SQL

duckdb -csv -c "SELECT m.code, m.manufacturer, m.model, count(g.n_number) AS aircraft
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_model.parquet' m LEFT JOIN 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet' g ON g.aircraft_model_code = m.code
  WHERE m.match_key = 'S76C' AND m.code NOT IN ('4900105', '4900103')
  GROUP BY ALL
  ORDER BY aircraft DESC
  LIMIT 12"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SELECT m.code, m.manufacturer, m.model, count(g.n_number) AS aircraft
FROM 'https://openairdocs.org/data/latest/faa_aircraft_model.parquet' m LEFT JOIN 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet' g ON g.aircraft_model_code = m.code
WHERE m.match_key = 'S76C' AND m.code NOT IN ('4900105', '4900103')
GROUP BY ALL
ORDER BY aircraft DESC
LIMIT 12

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.