- Registered owner
- Sierra Aeronautics LLC
- Location
- Franklin, KY
- Owner type
- LLC
- Serial number
- 55981
- Year built
- 1957
- Type
- Rotorcraft
- Engine
- Turbo-shaft
- Airworthiness
- Restricted, agriculture and pest control, weather control
- Airworthiness date
- April 3, 1989
- Certificate issued
- September 21, 2021
- Expires
- September 30, 2028
- Mode S code
- AA2177
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every AiResearch TPE331 model are included below.
On this page
Airworthiness directives that may apply · 61
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1963 | 1 |
|---|---|
| 1965 | 1 |
| 1967 | 2 |
| 1970 | 1 |
| 1971 | 1 |
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 2 |
| 1975 | 4 |
| 1976 | 2 |
| 1979 | 2 |
| 1980 | 2 |
| 1984 | 2 |
| 1987 | 1 |
| 1988 | 1 |
| 1989 | 1 |
| 1993 | 4 |
| 1994 | 1 |
| 1995 | 2 |
| 1997 | 1 |
| 1998 | 2 |
| 2001 | 1 |
| 2002 | 2 |
| 2003 | 1 |
| 2004 | 1 |
| 2006 | 2 |
| 2009 | 1 |
| 2011 | 1 |
| 2012 | 1 |
| 2015 | 2 |
| 2016 | 2 |
| 2018 | 4 |
| 2021 | 1 |
| 2023 | 1 |
Airframe · Sikorsky S-55
AD 2023-11-07Ground Proximity SystemAD 66-04-03Main Rotor BladesAD 75-22-12Inflight Power LossInformation bulletins that may apply · 4
Advisory, not mandatory.
NTSB investigations
No NTSB investigations matched to N752AMatched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Sikorsky S-55 aircraft
FAA incident reports
No FAA accident or incident reports matched to N752AMatched by N-number and event date, checked against the reported make and model. Reports from before this aircraft carried the mark are under Earlier aircraft. Reports on Sikorsky S-55 aircraft
Service difficulty reports
No reports matched to N752AGeneral aviation reporting is voluntary. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Reports on Sikorsky S-55 aircraft
STCs that may be installed · 47
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
See all 47 STCs