- Registered owner
- Ellis LLC
- Location
- Helena, MT
- Owner type
- LLC
- Serial number
- 0524E
- Type
- Rotorcraft
- Engine
- Turbo-shaft
- Airworthiness
- Standard, normal
- Airworthiness date
- October 4, 1995
- Certificate issued
- September 24, 2025
- Expires
- September 30, 2032
- Mode S code
- A134D7
Mcdonnell Douglas Heli 500-ETCDS H3WEAirframe · Mcdonnell Douglas Heli 500-ETCDS E4CEEngine · Allison 250-C20 series
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every Allison 250-C20 model are included below.
On this page
Airworthiness directives that may apply · 21
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1972 | 1 |
|---|---|
| 1973 | 1 |
| 1974 | 1 |
| 1977 | 2 |
| 1979 | 1 |
| 1981 | 1 |
| 1982 | 2 |
| 1984 | 1 |
| 1989 | 1 |
| 1994 | 1 |
| 1996 | 1 |
| 1999 | 1 |
| 2001 | 1 |
| 2005 | 3 |
| 2006 | 2 |
| 2012 | 1 |
| 2015 | 1 |
| 2017 | 1 |
| 2018 | 1 |
| 2022 | 1 |
Engine · Allison 250-C20 series
AD 2022-10-06Turbine SectionAD 2018-13-01Turbine GovernorAD 2006-16-04Inspection of the fuel nozzle screenInformation bulletins that may apply · 1
Advisory, not mandatory.
Engine · Allison 250-C20 series
SAIB CE-01-10NTSB investigations
No NTSB investigations matched to N177TMatched 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 Mcdonnell Douglas Heli 500-E aircraft
FAA incident reports
No FAA accident or incident reports matched to N177TMatched 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 Mcdonnell Douglas Heli 500-E aircraft
Service difficulty reports
No reports matched to N177TGeneral 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 Mcdonnell Douglas Heli 500-E aircraft
STCs that may be installed · 8
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
Engine · Allison 250-C20 series
STC SE2352NMModification of turbine engine.STC SE5511NMInstallation of compressor discharge pressue (PC) valve.STC SE769NWInstallation of Soloy Part No. 250-1001-1 fuel line.STC SE00014ENInstallation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models.STC SE00027ENInstallation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models.STC SE492GLIncorporation of a fuel flow transducer.STC ST00037ATUnison igniter plugs, P/N 9044400-1.STC SQ00338ATUnison igniter leads, P/N9048222-101, 102, 103, 104, 105, 106.
Earlier aircraft with this N-number · 1
This aircraft carried N177T before the one registered now. The FAA can assign a mark to another aircraft once a registration is cancelled.