- Registered owner
- Valiair Lc Trustee
- Location
- Casper, WY
- Owner type
- LLC
- Serial number
- LN028
- Year built
- 1992
- Type
- Rotorcraft
- Engine
- Reciprocating
- Airworthiness
- Multiple
- Airworthiness date
- June 29, 2023
- Certificate issued
- April 28, 2025
- Expires
- April 30, 2032
- Mode S code
- A689A0
Mcdonnell Douglas Helicopter 520NTCDS H3WEAirframe · Mcdonnell Douglas Helicopter 520NEngine modelAllison 250 series
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every Allison 250 model are included below.
On this page
Airworthiness directives that may apply · 54
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1968 | 2 |
|---|---|
| 1969 | 4 |
| 1972 | 1 |
| 1973 | 1 |
| 1974 | 1 |
| 1977 | 2 |
| 1978 | 1 |
| 1979 | 3 |
| 1980 | 1 |
| 1981 | 1 |
| 1982 | 4 |
| 1983 | 2 |
| 1984 | 2 |
| 1985 | 1 |
| 1986 | 8 |
| 1988 | 1 |
| 1989 | 2 |
| 1994 | 1 |
| 1996 | 2 |
| 1997 | 2 |
| 1998 | 1 |
| 1999 | 1 |
| 2001 | 1 |
| 2002 | 1 |
| 2003 | 1 |
| 2004 | 1 |
| 2005 | 5 |
| 2006 | 3 |
| 2012 | 1 |
| 2015 | 1 |
| 2017 | 1 |
| 2018 | 1 |
| 2022 | 1 |
See all 62 ADs
Information bulletins that may apply · 6
Advisory, not mandatory.
Engine · Allison 250 series
SAIB NE-06-52SAIB NE-06-12R1SAIB NE-04-58SAIB NE-04-57SAIB NE-04-56SAIB CE-01-10Historical bulletins · 1
NTSB investigations
No NTSB investigations matched to N520HCMatched 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 Helicopter 520N aircraft
FAA incident reports
No FAA accident or incident reports matched to N520HCMatched 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 Helicopter 520N aircraft
Service difficulty reports
No reports matched to N520HCGeneral 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 Helicopter 520N aircraft
STCs that may be installed · 12
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 series
STC SE2352NMModification of turbine engine.STC SE00057ATInstallation of Aeronautical Accessories, Inc., Pc Safety Valve KitSTC SE00327ATInstallation of PC Safety Valve Kit.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 SE00026ENInstallation of Pratt & Whitney Engine Services Inc. IntelliStart Plus Electronic Control Unit (ECU), P/N DPU-K-010 on specified 250 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 SE578GLInstallation 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.