N521FB1991 Mcdonnell Douglas Helicopter 500N
This N-number isn't registered right now. Below is its last known registration, canceled Dec 13, 2006.
Safety record in brief:No NTSB accidents or incidents since 19823 ADs may apply13 service difficulty reports
- Registration
- Deregistered
Registration
FAA Aircraft Registry · Oct 20, 2026- Last registered owner
- Individual owner
- City, state
- Mesa, AZ
- Canceled
- Dec 13, 2006
- Airworthiness
- Standard · Normal
- Airworthiness date
- Oct 24, 1991
We never show street addresses, even though they appear in the public FAA file. Individual owners are shown by city and state only.
Airframe & engine
FAA Registry + type dataAirframe
- Manufacturer
- Mcdonnell Douglas Helicopter
- Model
- 500N
- Year
- 1991
- Serial number
- LN001
- Aircraft type
- Rotorcraft
- Category
- Land
- Certification
- Type Certificated
- Seats
- 4
- Engines
- 1
- Max takeoff weight
- Up to 12,499 lb
- Type certificate data sheet
- H3WE
- Mode S code
- A68D24
Engine
- Make and model
- Allison 250-C20 Ser
- Type
- Turbo-shaft
- Power
- 420 hp
Total time and engine hours aren't public. They appear here once the owner adds logbooks.
Ownership history
Ownership history from FAA records- until 2006Individual ownerMesa, AZ
Individual owners are shown by city and state only.
Safety record
NTSB · Oct 15, 2026 · FAA ADs · Oct 20, 2026 · SDRs · Oct 16, 2026NTSB events (0)
No NTSB accidents or incidents found for this airframe since 1982.
Accident history for this modelADs published since 1998 that may apply (3)
These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
| AD | Subject | Effective | Applies to |
|---|---|---|---|
| 2006-16-04 | Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division… | Sep 7, 2006 | Engine (250-C20 SER) |
| 2006-13-06 | Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division… | Jul 26, 2006 | Engine (250-C20 SER)Only with: Engines with gas producer rotor assembly tie bolt P/Ns A23008020, E23008020 (EXTEX), 23008020, 6843388, 6876991 (RRC), A23008020 (SAP), or 23008020P (Pacific Sky Supply) installed. |
| 2005-10-13 | Rolls-Royce Corporation (Formerly Allison Engine Company) 250-B17B, -B17C, -B17D, -B17E… | Jun 22, 2005 | Engine (250-C20 SER)Only with: Engines that do not have turbine energy absorbing ring RRC P/N 23035175, or an equivalent FAA-approved serviceable ring, installed. |
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
Service Difficulty Reports (13)
Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.
- Main rotor · mast · damagedOct 13, 2000
FOUND PAINT SEALANT INSIDE MAIN ROTOR MAST TUBE BLISTERED AND FALLING INTO M/R TRANSMISSION GEARBOX. APPEARED THAT M/R TRANSMISSION OIL MOBILE SHC 626 IS NOT COMPATIBLE WITH SEALANT PAINT ON INSIDE OF M/R MAST.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Rotor flight controls · push rod · damagedMay 22, 1998
DURING INSPECTION PRIOR TO INSTALLATION, GREASE SEALS ON ROD END WERE FOUND TO HAVE DENTS AND DEFORMED FROM FACTORY BUILD-UP.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Rotor flight controls · torque tube · misdrilledMay 22, 1998
COLLECTIVE TORQUE TUBE HAS BOLT HOLES NOT DRILLED TO PROPER SIZE FOR GEARBOX MOUNT BOLTS TO BE PASSED THROUGH. TWO EACH PARTS FROM FACTORY BOTH UNDERSIZED HOLES.
From FAA Service Difficulty Reports; matched by N-number and serial number.
Show all 10 reportsShow fewer reports
- Fuel · cap · no lockMay 3, 1997
ACFT S/N LN001 THROUGH LN007 REPORTED 30 EACH FUEL CAPS HAVE WORN LOCK TABS AND REQUIRED REPLACEMENT. FUEL CAP WILL NOT LOCK PROPERLY. NO REPAIR CAP HAS TO BE CHANGED.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Fuel · cap · failedMay 3, 1997
LOCK TAB ON FUEL CAP WORN AT CAM END. FUEL CAP WILL NOT LOCK PROPERLY. NO REPAIR. CAP MUST BE REPLACED.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Fuselage · ring assy · crackedApr 23, 1997
RIGHT LOWER 137.50 BULKHEAD RING ASSY CRACKED 1 INCH UP AND COMPLETELY THROUGH SKIN ATTACH TURN-BACK. THIS CRACK IS RELATED TO FLOAT LIGHT INSTALLATION.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Fuselage · stringer · crackedApr 23, 1997
FIRST STRINGER LEFT OF CENTER KEEL CRACKED AT AFT END 1.50 INCHES. THIS CRACKING APPEARS TO BE RELATED TO FLOAT LIGHT MOUNTING PROCEDURES.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Fuselage · stringer · crackedApr 23, 1997
STRINGER CRACKED APPROXIMATELY 1.50 INCHES LONG AT AFT END. FIRST STRINGER TO RIGHT OF KEEL AT CENTER. THIS CRACKING APPEARS TO BE RELATED TO FLOAT LIGHT MOUNTING PROCEDURE.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Lights · lens · crackedMar 28, 1997
LOWER AFT LENSE CRACKED. NEW STYLE, AND NEW STYLE PLASTIC CLAMP. LENS SENT TO WHELEN.
From FAA Service Difficulty Reports; matched by N-number and serial number. - Lights · lens · crackedFeb 25, 1997
BASE OF LENS CRACKED FROM MOUNT RING CLAMP DUE TO VIBRATION. FOUND ON INSPECTION, APPROXIMATELY 250 HOURS.
From FAA Service Difficulty Reports; matched by N-number and serial number.
Showing the 10 most recent of 13 reports.
Sources
- FAA Aircraft RegistryRegistration, owner city and state, airframe, engineupdated Oct 20, 2026
- NTSB accident and incident databaseAccidents and incidents since 1982updated Oct 15, 2026
- FAA Airworthiness Directives (Federal Register)ADs published since 1998updated Oct 20, 2026
- FAA Service Difficulty ReportsReports since 1995updated Oct 16, 2026