Type Record · As of May 3, 2026
DEHAVILLAND DHC-6 TWIN OTTER
Fixed Wing Multi Engine · P&W CANADA PT6A-60A
Registered
26
Year Range
1966–1979
NTSB Events
18
Airworthiness Directives
0
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered DEHAVILLAND DHC-6 TWIN OTTER aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- FL 19.2% 5
- CO 11.5% 3
- CA 11.5% 3
- MT 11.5% 3
- NV 7.7% 2
- DE 7.7% 2
- UT 3.8% 1
- TX 3.8% 1
- IL 3.8% 1
- OK 3.8% 1
+4 more states
By Decade of Manufacture
- 1960s 69.2% 18
- 1970s 15.4% 4
- Unknown 15.4% 4
02 / NTSB Records
Events involving DEHAVILLAND DHC-6 TWIN OTTER aircraft
18 event(s) on file. Showing the most recent 18.
-
Jun 8, 2025
N166DHTullahoma, Tennessee Serious
NTSB Docket → -
Aug 23, 2014
N202EHPepperell, Massachusetts
NTSB Docket → -
Jun 13, 2009
N204EHOrange, Virginia Serious
NTSB Docket → -
Apr 23, 2005
N24HVDeland, Florida Fatal
NTSB Docket → -
Jun 15, 2001
N30EAOttawa, Illinois Serious
NTSB Docket → -
May 27, 2001
N125PMFentress, Texas Fatal
NTSB Docket → -
Nov 8, 1997
N1022SELBERTA, Alabama Fatal
NTSB Docket → -
Apr 27, 1996
N716NCRAEFORD, North Carolina Fatal
NTSB Docket → -
Jul 23, 1995
N926MABELEN, New Mexico Fatal
NTSB Docket → -
Dec 9, 1990
N121PMPERRIS VALLEY, California Minor
NTSB Docket → -
Apr 13, 1989
N100APBARROW, Alaska
NTSB Docket → -
Feb 7, 1986
N204EHMEKORYUK, Alaska
NTSB Docket → -
Oct 4, 1979
N926MAHOUSTON, Texas
NTSB Docket → -
Jun 4, 1971
N121PMFLUSHING, New York
NTSB Docket → -
Mar 22, 1970
N70465MEXIA, Texas Minor
NTSB Docket → -
Mar 6, 1970
N121PMWINDSOR LOCK, Connecticut
NTSB Docket → -
Nov 12, 1968
N64150AVALON, California
NTSB Docket → -
Jan 19, 1967
N121PMFARMINGDALE, New York
NTSB Docket →
02b / NASA ASRS Reports
Near-miss reports involving DEHAVILLAND DHC-6 TWIN OTTER
NASA's voluntary, confidential reporting system surfaces what almost went wrong. 5 de-identified ASRS reports reference this airframe. Pilot-written narrative. ASRS reports are voluntary and not investigated — they represent the reporter's perspective and cannot infer prevalence.
- ACN 1900801 Bird or Animal Strike Reports
Skydive Pilot reported rejecting a takeoff due to an animal crossing the runway resulting in a runway excursion.
Twin Otter DHC-6
- ACN 2027217 Global Positioning (GPS) Reports
C-185 floatplane Captain reported a NMAC event during initial climb with an non-reporting landing aircraft. The floatplane Captain took immediate evasive action to avoid a collision.
Skywagon 185
- ACN 1780845 Parachutist / Aircraft Conflicts
Pilot flying DHC-6 aircraft reported cabin door departed inflight.
Twin Otter DHC-6
- ACN 1669809 Parachutist / Aircraft Conflicts
A Center Controller reported an NMAC between parachute jump aircraft and a VFR aircraft.
Twin Otter DHC-6
- ACN 1577367 Parachutist / Aircraft Conflicts
A skydiver reported that the jump aircraft may have experienced an inflight upset.
Twin Otter DHC-6
02c / Academic Research
Scholarly work mentioning DEHAVILLAND DHC-6 TWIN OTTER
Papers and reports across NASA, NTSB, FAA CAMI, AOPA ASI, Embry-Riddle, arXiv, and the broader academic graph that mention this airframe. Title or keyword match — drill into each for full abstract + author list + PDF link.
- NASA NTRS 2019 · Contractor Report (CR)
DHC-6 Twin Otter Tailplane Airfoil Section Testing in the Ohio State University 7x10 Wind Tunnel
Ice contaminated tailplane stall (ICTS) has been found to be responsible for 16 accidents with 139 fatalities over the last three decades, and is suspected to have played a role in other accidents and…
- NASA NTRS 2019 · Reprint (Version printed in journal)
In-Flight Aerodynamic Measurements of an Iced Horizontal Tailplane
The effects of tailplane icing on aircraft dynamics and tailplane aerodynamics were investigated using, NASA's modified DHC-6 Twin Otter icing research aircraft.
- NASA NTRS 2019 · Reprint (Version printed in journal)
Investigation of Dynamic Flight Maneuvers With an Iced Tailplane
A detailed analysis of two of the dynamic maneuvers, the pushover and elevator doublet, from the NASA/FAA Tailplane Icing Program are discussed.
Browse the full corpus — academia portal ↗
03 / Airworthiness Directives
FAA directives applicable to DEHAVILLAND DHC-6 TWIN OTTER
No matching airworthiness directives are on file for this make and model in the Federal Register.
06 / Supplemental Type Certificates
Modifications approved for DEHAVILLAND DHC-6 TWIN OTTER
10 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
04/09/2010
STC SA00269BO (2 OF 3)
Installation of Avidyne Corporation TWX 670 Tactical Weather Detection System P/N 850-00026-000-( ) consisting of Avidyne Processor P/N 700-00033-000-( ), Sensor Systems Inc. Anten…
Avidyne Corporation
-
12/30/2008
STC SA00269BO (2 OF 3)
Installation of Avidyne Corporation TWX 670 Tactical Weather Detection System P/N 850-00026-000-( ) consisting of Avidyne Processor P/N 700-00033-000-( ), Sensor Systems Inc. Anten…
Avidyne Corporation
-
07/22/2008
STC SA01861SE (PAGE 2)
Fabrication and installation of Landing Light Controller
Seaton Engineering Corp.
-
05/21/2008
STC SA01473SE (2 OF 5)
Installation of a GTX 32 (mode C), GTX 33 (mode S), or GTX 33D (mode S with diversity) Remote Transponde
Garmin AT Inc.
-
04/07/2008
STC SA00269BO (2 OF 3)
Installation of Avidyne Corporation TWX 670 Tactical Weather Detection System P/N 850-00026-000-( ) consisting of Avidyne Processor P/N 700-00033-000-( ), Sensor Systems Inc. Anten…
Avidyne Corporation
-
01/04/2008
STC SA01800SE (PG 3)
Fabrication and installation of new or replacement of existing instrument panel lights dimmer control.
Seaton Engineering Corp.
-
12/18/2007
STC SA4005NM (Page 1)
Precise Flight Inc. Pulselite Control System
Precise Flight Inc
-
11/05/2006
STC SA01933LA (2 OF 5)
Installation of Garmin Model 400W / 500W Series GPS-WAAS Navigation System
Garmin AT Inc.
-
02/26/2003
STC SA39CH
Installation of amphibian landing gear position advisory system.
Lake & Air Inc
-
03/09/1993
STC SA1626NM Page 1
Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series)
Electronics International
07 / PMA replacement parts
FAA-approved replacement parts for DEHAVILLAND DHC-6 TWIN OTTER
60+ parts on file from the FAA Parts Manufacturer Approval database. Each is a non-OEM part the FAA has authorized for use as a replacement on this aircraft type.
-
1193VRW#https://drs.faa.gov/browse/excelExternalWindow/FE131ECC8552F31686257F0700735220.0001##
Marker- Closed
Aero Decals Inc replaces C61005653
PMA holder → -
AAT-711419#https://drs.faa.gov/browse/excelExternalWindow/F9157A3B581800ED86257F80004A9ECA.0001##
Piston Tube
Advantage Aviation Technologies, Inc. replaces DeHavilland P/N 71-141-9
PMA holder → -
AAT-711419#https://drs.faa.gov/browse/excelExternalWindow/0BFB86343020BE5B86257C2E006A9E15.0001##
Piston Tube
Advantage Aviation Technologies, Inc. replaces DeHavilland P/N 71-141-9
PMA holder → -
AAT-711419#https://drs.faa.gov/browse/excelExternalWindow/E5B0BC655F81CABD8625792D00628DFD.0001##
Piston Tube
Advantage Aviation Technologies, Inc. replaces DeHavilland P/N 71-141-9
PMA holder → -
MDL PF6-1000#https://drs.faa.gov/browse/excelExternalWindow/CADA6C2C8193D3ED8625782900530D48.0001##
Fail Lights, Pitot Heater
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
MDL PF6-1000#https://drs.faa.gov/browse/excelExternalWindow/503295F8684373548625793600567194.0001##
Fail Lights, Pitot Heater
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
MDL PF6-1000#https://drs.faa.gov/browse/excelExternalWindow/ABED2191629E5A81862576DD0050102B.0001##
Fail Lights, Pitot Heater
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
213666#https://drs.faa.gov/browse/excelExternalWindow/B6CB105C6D4FFAE3862573CA00593C33.0001##
Synchronizer Kits
Woodward Inc replaces -
PMA holder → -
AB16B12#https://drs.faa.gov/browse/excelExternalWindow/C7C78B6588DDB14186257417007BB3CD.0001##
Rivet
Aero Brake & Spares Inc replaces GY16B12 For use on ABS (Goodyear) Brake assembly P/N 5001571-4 and 5001571-6
PMA holder → -
ABWA182-5#https://drs.faa.gov/browse/excelExternalWindow/3F63A3D051AB25328625740300743279.0001##
Washer
Aero Brake & Spares Inc replaces GWA182-5, Rev.C For use on ABS (Goodyear) Wheel Assy-Main P/N 5000444-3
PMA holder → -
00625001 or 00625100#https://drs.faa.gov/browse/excelExternalWindow/454EA51DEB31CCA7862573FD0073DE07.0001##
Underseat Baggage Restraint Bar
Devore Aviation Corp of America replaces -
PMA holder → -
00600001#https://drs.faa.gov/browse/excelExternalWindow/008C03DE7E0F99ED862573FD0073D2DC.0001##
Emblem Light -Stabilizer
Devore Aviation Corp of America replaces -
PMA holder → -
C38214#https://drs.faa.gov/browse/excelExternalWindow/311330C212A5CEA686257EF300681426.0001##
Adaptor
Parker Hannifin Corp replaces C38214
PMA holder → -
C38214#https://drs.faa.gov/browse/excelExternalWindow/2C5356E786DEB0F586257EF30067DFC1.0001##
Adaptor
Parker Hannifin Corp replaces C38214
PMA holder → -
MA150-301#https://drs.faa.gov/browse/excelExternalWindow/BE81EAEE1205042186257B9500678031.0001##
Air Conditioner Installation DHC-6 Twin Otter Kit
ZEE Systems Inc replaces Modification Part
PMA holder → -
K43-R134#https://drs.faa.gov/browse/excelExternalWindow/BEF00665E4A6281C86257B9500678035.0001##
Modification Kit
ZEE Systems Inc replaces Modification Part
PMA holder → -
A5529VWB#https://drs.faa.gov/browse/excelExternalWindow/D87840C30C5DA56786257B740072B2BF.0001##
Marker- Stripe
Aero Decals Inc replaces C6CE132727
PMA holder → -
DHC6-000#https://drs.faa.gov/browse/excelExternalWindow/5074E020EB6F69848625782900530D1B.0001##
Freon Air Conditioning System
IKHANA Aircraft Services replaces DHC6-000
PMA holder → -
WR6-1002-61#https://drs.faa.gov/browse/excelExternalWindow/F6A218AD2749A0698625782900530CF2.0001##
Re-Life Wing Box R/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
WR6-1002-59#https://drs.faa.gov/browse/excelExternalWindow/7BA02677CC6853DA8625782900530CC2.0001##
Re-Life Wing Box L/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
DHC6-000#https://drs.faa.gov/browse/excelExternalWindow/2056E775A7B71F848625793600567159.0001##
Freon Air Conditioning System
IKHANA Aircraft Services replaces DHC6-000
PMA holder → -
WR6-1002-61#https://drs.faa.gov/browse/excelExternalWindow/2755D77DDF6FD8F3862579360056711F.0001##
Re-Life Wing Box R/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
WR6-1002-59#https://drs.faa.gov/browse/excelExternalWindow/6F84EA0692B835168625793600567024.0001##
Re-Life Wing Box L/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
DHC6-000#https://drs.faa.gov/browse/excelExternalWindow/A9F4C6FCCD5B458B862576DD00501075.0001##
Freon Air Conditioning System
IKHANA Aircraft Services replaces DHC6-000
PMA holder → -
WR6-1002-61#https://drs.faa.gov/browse/excelExternalWindow/E2AF5341D7626B9D862576DD00500FEE.0001##
Re-Life Wing Box R/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
WR6-1002-59#https://drs.faa.gov/browse/excelExternalWindow/7FDCEDA7C2E866E0862576DD00500F4D.0001##
Re-Life Wing Box L/H
IKHANA Aircraft Services replaces Modification Part
PMA holder → -
PDMC6WM1409-33#https://drs.faa.gov/browse/excelExternalWindow/A0B2B863A5AECF08862570AF00745D06.0001##
Bushing
PMA Design & Manufacturing replaces C6WM1409-33
PMA holder → -
PDMC6WM1409-31#https://drs.faa.gov/browse/excelExternalWindow/167D98FB0D40BC4B862570AF0074544E.0001##
Bushing
PMA Design & Manufacturing replaces C6WM1409-31
PMA holder → -
PDMC6WM1409-29#https://drs.faa.gov/browse/excelExternalWindow/9EEDCC18C6E8ED10862570AF00744BD6.0001##
Bushing
PMA Design & Manufacturing replaces C6WM1409-29
PMA holder → -
250SG115Q#https://drs.faa.gov/browse/excelExternalWindow/2153E1215374B076862576F0004FD482.0001##
Starter- Generator
Skurka Aerospace Inc replaces Modification Part
PMA holder → -
951#https://drs.faa.gov/browse/excelExternalWindow/49F68CE0686A438A862573BD005DBB35.0001##
Right Windshield
LP Aero Plastics Inc replaces DehavillandC6FS1207-28
PMA holder → -
950#https://drs.faa.gov/browse/excelExternalWindow/1C9F3CAA8EF400DF862573BD005DBB1F.0001##
Left Windshield
LP Aero Plastics Inc replaces DehavillandC6FS1207-27
PMA holder → -
P/N C6SC1062-4#https://drs.faa.gov/browse/excelExternalWindow/0C192AAC2048935986257FFE005BECF9.0001##
R/H Windshield
PPG Industries Inc replaces Dehavilland P/N C6SC1062-4 Rev. G or later FAA approval
PMA holder → -
P/N C6SC1062-3#https://drs.faa.gov/browse/excelExternalWindow/AB448B63CA811F7886257FFE005BEC39.0001##
L/H Windshield
PPG Industries Inc replaces Dehavilland P/N C6SC1062-3 Rev. G or later FAA approval
PMA holder → -
7350721-7#https://drs.faa.gov/browse/excelExternalWindow/049C19AB921E1D9D8525703D005E0741.0001##
Mount Installation Engine
Hutchinson Aerospace & Industry Inc replaces DeHavilland 7350721-7
PMA holder → -
7350721-8#https://drs.faa.gov/browse/excelExternalWindow/F36E7F567214F1D18525703D005E0742.0001##
Mount Installation Engine
Hutchinson Aerospace & Industry Inc replaces DeHavilland 7350721-8
PMA holder → -
7350721-8#https://drs.faa.gov/browse/excelExternalWindow/2DA9537B1B6F14288525703D005E0D57.0001##
Isolator Assembly
Hutchinson Aerospace & Industry Inc replaces DeHavilland 7350721-8
PMA holder → -
ST-472#https://drs.faa.gov/browse/excelExternalWindow/95D494E36A439A88862575540062BFF5.0001##
Autopilot
S-TEC Corporation replaces -
PMA holder → -
Dwg No. 992-1486-001#https://drs.faa.gov/browse/excelExternalWindow/BCE82007BC6B76C68525704A005B226A.0001##
APS-65 Autopilot Installation Kit
Rockwell Collins Inc. replaces Boeing of Canada Ltd., de Havilland Division 992-1486-001
PMA holder → -
7350721-7#https://drs.faa.gov/browse/excelExternalWindow/B8134FAFDB8FE0328525703D005E0D56.0001##
Isolator Assembly
Hutchinson Aerospace & Industry Inc replaces DeHavilland 7350721-7
PMA holder →
+ 20 more PMA parts on file
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for DEHAVILLAND DHC-6 TWIN OTTER
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 26 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N100AP | NV | 1967 | ● | Look up ↗ |
| N1022S | FL | — | ● | Look up ↗ |
| N121PM | DE | 1966 | ● | Look up ↗ |
| N125PM | CO | 1967 | ● | Look up ↗ |
| N125SA | CA | 1968 | · | Look up ↗ |
| N128WJ | MT | 1968 | · | Look up ↗ |
| N162DE | UT | 1979 | · | Look up ↗ |
| N166DH | DE | 1967 | ● | Look up ↗ |
| N190KM | TX | 1968 | · | Look up ↗ |
| N194LH | MT | — | · | Look up ↗ |
| N202EH | FL | 1967 | ● | Look up ↗ |
| N204EH | FL | 1967 | ● | Look up ↗ |
| N24HV | FL | — | ● | Look up ↗ |
| N30EA | IL | 1968 | ● | Look up ↗ |
| N593UR | FL | 1978 | · | Look up ↗ |
| N603M | OK | — | · | Look up ↗ |
| N607NA | TN | 1966 | · | Look up ↗ |
| N62LH | MT | 1968 | · | Look up ↗ |
| N64150 | CA | 1968 | ● | Look up ↗ |
| N70464 | CO | 1977 | · | Look up ↗ |
| N70465 | CO | 1977 | ● | Look up ↗ |
| N716NC | NY | 1968 | ● | Look up ↗ |
| N901BS | NC | 1968 | · | Look up ↗ |
| N924MA | AZ | 1969 | · | Look up ↗ |
| N926MA | CA | 1968 | ● | Look up ↗ |
| N98VA | NV | 1967 | · | Look up ↗ |
Source — FAA Aircraft Registry · click "Look up" to query the live registry record (owner, address, last airworthiness)
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →