Lycoming TIO-540 series
5,079 aircraft on the U.S. register carry a Lycoming TIO-540 series engine, rated at about 310 horsepower. The Piper PA-32 Cherokee Six, Lance and Saratoga is the model most often fitted with it (1,727 aircraft). The aircraft carrying it were built between 1962 and 2024.
The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Lycoming TIO-540 series (3 codes). FAA spellings: TI0-540 SER · TIO 540 SER · TIO 540 SER.
Fitted to model families
Piper PA-32 Cherokee Six, Lance and Saratoga1,727Piper PA-31 Navajo and Chieftain561Piper PA-24 Comanche535Piper PA-23 Apache and Aztec513Cessna T182 Turbo Skylane313Piper PA-46 Malibu, Mirage, Matrix and M-Class254Cessna T206 Turbo Stationair253Mooney M-20223Bellanca 17 Viking109Aero Commander 50095Rockwell International 11476Smith AEROSTAR 60173
Piper PA-32 Cherokee Six, Lance and Saratoga · Piper PA-31 Navajo and Chieftain · Piper PA-24 Comanche · Piper PA-23 Apache and Aztec · Cessna T182 Turbo Skylane · Piper PA-46 Malibu, Mirage, Matrix and M-Class · Cessna T206 Turbo Stationair · Mooney M-20 · Bellanca 17 Viking · Aero Commander 500
Where they are owner's state
Florida519Texas494California391Delaware238Arizona150Colorado142Georgia135Ohio129Alaska127Tennessee117
Kind of aircraft
Piston singles3,407 (67%)Piston twins1,350 (27%)Turboprops319 (6%)Helicopters3 (0.1%)
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Lycoming TIO-540 series the component layer
No FAA order in the current files names this engine series. Operators and repair shops have filed 363 failure reports with the FAA since 1995, 11 of them in the last ten years.
Failure reports 363 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Bolt15Pump10Cylinder8Regulator8Skin8Tube8Spar7Wheel7Bearing6Brace6
Latest reports
2025-05-20Actuator: broken
2024-03-05Magneto: worn
2021-05-19None: collapsed
2019-12-26Torque Link: separated
2019-08-07Probe: false indication
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how this engine series links to the rest of the register
Fitted to
- Piper PA-32 Cherokee Six, Lance and Saratoga 1,727 with this engine series
- Piper PA-31 Navajo and Chieftain 561 with this engine series
- Piper PA-24 Comanche 535 with this engine series
- Piper PA-23 Apache and Aztec 513 with this engine series
- Cessna T182 Turbo Skylane 313 with this engine series
- Piper PA-46 Malibu, Mirage, Matrix and M-Class 254 with this engine series
- Cessna T206 Turbo Stationair 253 with this engine series
- Mooney M-20 223 with this engine series
Where they are
- Florida 519 of these aircraft
- Texas 494 of these aircraft
- California 391 of these aircraft
- Delaware 238 of these aircraft
- Arizona 150 of these aircraft
Biggest operators
- Central Airlines INC 20 of these aircraft
- Bas Part Sales LLC 20 of these aircraft
- International Air Services INC Trustee 19 of these aircraft
- Pacific Fleet Aviation LLC 18 of these aircraft
- Southern Aircraft Consultancy INC Trustee 17 of these aircraft
Airworthiness
- Failure reports on the Lycoming TIO-540 series 363 reports since 1995
Analytics
These connections as data: /graph/engine/lycoming-tio-540-series.json · about the eFlight graph.
Aircraft newest certificates first · 5,079
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N128A | Piper PA-32-300 |
Fixed-wing, single engine | Garza Family LLC Helena, Montana |
Standard | 2025-11-13 | ValidFAA registration status code V: Valid registration. All codes |
| N406DZ | Piper PA-31 |
Fixed-wing, multi-engine | Speedstar Aviation LLC Kalispell, Montana |
Standard | 2025-11-12 | ValidFAA registration status code V: Valid registration. All codes |
| N9242P | Piper PA-24-260 |
Fixed-wing, single engine | Co-owned owner California |
Standard | 2025-11-12 | ValidFAA registration status code V: Valid registration. All codes |
| N200P | Piper PA-31-350 |
Fixed-wing, multi-engine | 10X Aviation Partners LLC Stuart, Florida |
Standard | 2025-11-10 | ValidFAA registration status code V: Valid registration. All codes |
| N8710P | Piper PA-24-260 |
Fixed-wing, single engine | Nelson Aircraft Sales LLC Austin, Minnesota |
Standard | 2025-11-10 | ValidFAA registration status code V: Valid registration. All codes |
| N8890P | Piper PA-24-260 |
Fixed-wing, single engine | Individual owner Florida |
Standard | 2025-11-10 | ValidFAA registration status code V: Valid registration. All codes |
| N9522E | Bellanca 17-31ATC |
Fixed-wing, single engine | Individual owner New Mexico |
Standard | 2025-11-10 | ValidFAA registration status code V: Valid registration. All codes |
| N8832P | Piper PA-24-260 |
Fixed-wing, single engine | Individual owner Michigan |
Standard | 2025-11-08 | ValidFAA registration status code V: Valid registration. All codes |
| N30253 | Piper PA-32RT-300T |
Fixed-wing, single engine | Charter Rentals LLC Mantua, Ohio |
Standard | 2025-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N6230J | Piper PA-32R-300 |
Fixed-wing, single engine | Individual owner Alaska |
Standard | 2025-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N694RJ | Cessna T182T |
Fixed-wing, single engine | Atlas 182Rj LLC Port Townsend, Washington |
Standard | 2025-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N8932P | Piper PA-24-260 |
Fixed-wing, single engine | 260B LLC San Diego, California |
Standard | 2025-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N25M | Piper PA-24-260 |
Fixed-wing, single engine | Humble Ventures INC Tempe, Arizona |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N4172R | Piper PA-32-300 |
Fixed-wing, single engine | Redemption INC Kodiak, Alaska |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N6888F | Piper PA-32R-300 |
Fixed-wing, single engine | Atlanta Peach Air LLC Oxford, Georgia |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N8550R | Aerofab Inc LAKE 250 |
Fixed-wing, single engine | Cockpit Holdings CORP Melbourne, Florida |
Standard | 2025-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N135TW | Piper PA-31-350 |
Fixed-wing, multi-engine | Valiair Lc Trustee Casper, Wyoming |
Standard | 2025-11-05 | ValidFAA registration status code V: Valid registration. All codes |
| N822HW | Cessna T206H |
Fixed-wing, single engine | Cwm Air LLC Lewes, Delaware |
Standard | 2025-11-05 | ValidFAA registration status code V: Valid registration. All codes |
| N3760E | Piper PA-36-300 |
Fixed-wing, single engine | Wells Flying Services LLC Holdrege, Nebraska |
Restricted | 2025-11-04 | ValidFAA registration status code V: Valid registration. All codes |
| N9149X | Mooney M20M |
Fixed-wing, single engine | Individual owner Kansas |
Standard | 2025-11-04 | ValidFAA registration status code V: Valid registration. All codes |
| N1085K | Mooney M20M |
Fixed-wing, single engine | Co-owned owner New York |
Standard | 2025-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N285JL | Cessna T206H |
Fixed-wing, single engine | Link Air Service LLC Minong, Wisconsin |
Standard | 2025-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N2PN | Piper PA-31-350 |
Fixed-wing, multi-engine | Fugro USA Land INC Rapid City, South Dakota |
Restricted | 2025-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N4073R | Piper PA-32-300 |
Fixed-wing, single engine | Individual owner Maine |
Standard | 2025-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N962F | Piper PA-32R-301T |
Fixed-wing, single engine | Individual owner Virginia |
Standard | 2025-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N2193G | Mooney M20M |
Fixed-wing, single engine | Westward Aviation Boulder, Colorado |
Standard | 2025-10-30 | ValidFAA registration status code V: Valid registration. All codes |
| N147AJ | Cessna T182T |
Fixed-wing, single engine | Aviation Solutions LLC Louisville, Kentucky |
Standard | 2025-10-28 | ValidFAA registration status code V: Valid registration. All codes |
| N3228Q | Piper PA-32R-300 |
Fixed-wing, single engine | R&G Aviation LLC Jonesboro, Arkansas |
Standard | 2025-10-28 | ValidFAA registration status code V: Valid registration. All codes |
| N4797W | Rockwell International 114 |
Fixed-wing, single engine | Individual owner Colorado |
Standard | 2025-10-28 | ValidFAA registration status code V: Valid registration. All codes |
| N615HM | Smith AEROSTAR 601P |
Fixed-wing, multi-engine | Individual owner Arizona |
Standard | 2025-10-24 | ValidFAA registration status code V: Valid registration. All codes |
| N8977P | Piper PA-24-260 |
Fixed-wing, single engine | Warrior Up LLC Clayton, North Carolina |
Standard | 2025-10-23 | ValidFAA registration status code V: Valid registration. All codes |
| N5179B | Cessna T182T |
Fixed-wing, single engine | Corporate Flight Intl LLC Glenwood Springs, Colorado |
Standard | 2025-10-21 | ValidFAA registration status code V: Valid registration. All codes |
| N125SE | Smith AEROSTAR 601 |
Fixed-wing, multi-engine | Individual owner Texas |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N30381 | Piper PA-32RT-300T |
Fixed-wing, single engine | Co-owned owner Pennsylvania |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N364ST | Piper PA 46-350P |
Fixed-wing, single engine | Flight Following LLC Fayetteville, Georgia |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N75SG | Piper PA-32R-301T |
Fixed-wing, single engine | W e Love Ranch Marfa, Texas |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N8833P | Piper PA-24-260 |
Fixed-wing, single engine | Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes | |
| N97AA | Piper PA 46-350P |
Fixed-wing, single engine | Co-owned owner Texas |
Standard | 2025-10-20 | ValidFAA registration status code V: Valid registration. All codes |
| N83EC | Piper PA 46-350P |
Fixed-wing, single engine | Carter Associates INC Sturgis, Michigan |
Standard | 2025-10-19 | ValidFAA registration status code V: Valid registration. All codes |
| N13865 | Piper PA-23-250 |
Fixed-wing, multi-engine | Enzed Aviation Services LLC Anchorage, Alaska |
Standard | 2025-10-17 | ValidFAA registration status code V: Valid registration. All codes |
| N228JP | Cessna 182S |
Fixed-wing, single engine | Mazel Wings LLC Camden, Delaware |
Standard | 2025-10-17 | ValidFAA registration status code V: Valid registration. All codes |
| N394LE | Piper PA-32R-300 |
Fixed-wing, single engine | Sage Aviation LLC Milanville, Pennsylvania |
Standard | 2025-10-17 | ValidFAA registration status code V: Valid registration. All codes |
| N15895 | Piper PA-32-300 |
Fixed-wing, single engine | Ksgj Aircraft LLC Saint Augustine, Florida |
Standard | 2025-10-16 | ValidFAA registration status code V: Valid registration. All codes |
| N300LG | Piper PA-32-301T |
Fixed-wing, single engine | Individual owner South Carolina |
Standard | 2025-10-15 | ValidFAA registration status code V: Valid registration. All codes |
| N4133R | Piper PA-32-300 |
Fixed-wing, single engine | Flying Friends LLC Lynchburg, Virginia |
Standard | 2025-10-15 | ValidFAA registration status code V: Valid registration. All codes |
| N98PP | Piper PA-23-250 |
Fixed-wing, multi-engine | Media Stew LLC Carson City, Nevada |
Standard | 2025-10-15 | ValidFAA registration status code V: Valid registration. All codes |
| N5991V | Piper PA-32R-300 |
Fixed-wing, single engine | Co-owned owner California |
Standard | 2025-10-14 | ValidFAA registration status code V: Valid registration. All codes |
| N9124X | Mooney M20M |
Fixed-wing, single engine | Double Time Aviation LLC Sanbornton, New Hampshire |
Standard | 2025-10-14 | ValidFAA registration status code V: Valid registration. All codes |
| N9697S | Piper PA-32R-301T |
Fixed-wing, single engine | Melton Aviation LLC Allen, Texas |
Standard | 2025-10-14 | ValidFAA registration status code V: Valid registration. All codes |
| N43161 | Piper PA-32R-301T |
Fixed-wing, single engine | Individual owner Michigan |
Standard | 2025-10-09 | ValidFAA registration status code V: Valid registration. All codes |
| N5209F | Cessna T182T |
Fixed-wing, single engine | Midwest Avtech INC South Barrington, Illinois |
Standard | 2025-10-09 | ValidFAA registration status code V: Valid registration. All codes |
| N14SF | Bellanca 17-31A |
Fixed-wing, single engine | Co-owned owner Missouri |
Standard | 2025-10-08 | ValidFAA registration status code V: Valid registration. All codes |
| N409AK | Piper PA-32R-301T |
Fixed-wing, single engine | Individual owner Washington |
Standard | 2025-10-08 | ValidFAA registration status code V: Valid registration. All codes |
| N788JG | Piper PA-32R-301T |
Fixed-wing, single engine | Jg Aviation LLC Westport, Connecticut |
Standard | 2025-10-08 | ValidFAA registration status code V: Valid registration. All codes |
| N35890 | Piper PA-31-350 |
Fixed-wing, multi-engine | Ja Aero LLC Chicago, Illinois |
Standard | 2025-10-07 | ValidFAA registration status code V: Valid registration. All codes |
| N421TB | Socata TB21 |
Fixed-wing, single engine | Hale Concepts LLC Marietta, Ohio |
Standard | 2025-10-07 | ValidFAA registration status code V: Valid registration. All codes |
| N60TT | Piper PA-32-300 |
Fixed-wing, single engine | Ourhappyfamilyplane LLC Mason, Ohio |
Standard | 2025-10-07 | ValidFAA registration status code V: Valid registration. All codes |
| N245AG | Piper PA-23-250 |
Fixed-wing, multi-engine | Individual owner Washington |
Standard | 2025-10-06 | ValidFAA registration status code V: Valid registration. All codes |
| N787RK | Aero Commander 500 S |
Fixed-wing, multi-engine | Epitrop Foundation Wilmington, Delaware |
Standard | 2025-10-03 | Reports overdueFAA registration status code N: Non-citizen corporation that has not returned its flight-hour reports. All codes |
| N8794P | Piper PA-24-260 |
Fixed-wing, single engine | Individual owner Arizona |
Standard | 2025-10-02 | ValidFAA registration status code V: Valid registration. All codes |
| N4322E | Piper PA 46-350P |
Fixed-wing, single engine | Hk9 Air LLC Bryson City, North Carolina |
Standard | 2025-10-01 | ValidFAA registration status code V: Valid registration. All codes |
| N5513N | Cessna T182 |
Fixed-wing, single engine | Big Blue Aviation LLC Pinehurst, North Carolina |
Standard | 2025-09-29 | ValidFAA registration status code V: Valid registration. All codes |
| N55RR | Smith AEROSTAR 601P |
Fixed-wing, multi-engine | Mountain Boss Hoss Cycles INC Somerset, Pennsylvania |
Standard | 2025-09-29 | ValidFAA registration status code V: Valid registration. All codes |
| N6944Y | Piper PA-23-250 |
Fixed-wing, multi-engine | Lg Aztec LLC Boynton Beach, Florida |
Standard | 2025-09-29 | ValidFAA registration status code V: Valid registration. All codes |
| N9292N | Piper PA-32R-301T |
Fixed-wing, single engine | N9292N LLC Valdosta, Georgia |
Standard | 2025-09-29 | ValidFAA registration status code V: Valid registration. All codes |
| N4135R | Piper PA-32-300 |
Fixed-wing, single engine | Individual owner Idaho |
Standard | 2025-09-28 | ValidFAA registration status code V: Valid registration. All codes |
| N9262Y | Piper PA 31P 350 |
Fixed-wing, multi-engine | Twin Star Montana LLC Kalispell, Montana |
Standard | 2025-09-28 | ValidFAA registration status code V: Valid registration. All codes |
| N9331P | Piper PA-24-260 |
Fixed-wing, single engine | Individual owner Minnesota |
Standard | 2025-09-28 | ValidFAA registration status code V: Valid registration. All codes |
| N8173P | Piper PA-32-301T |
Fixed-wing, single engine | Lao Investments LLC Meeker, Colorado |
Standard | 2025-09-27 | ValidFAA registration status code V: Valid registration. All codes |
| N8428P | Piper PA-24-250 |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2025-09-26 | ValidFAA registration status code V: Valid registration. All codes |
| N8759P | Piper PA-24-260 |
Fixed-wing, single engine | Individual owner California |
Standard | 2025-09-26 | ValidFAA registration status code V: Valid registration. All codes |
| N2461M | Piper PA-32-300 |
Fixed-wing, single engine | Individual owner Texas |
Standard | 2025-09-25 | ValidFAA registration status code V: Valid registration. All codes |
| N6092Y | Piper PA-23-250 |
Fixed-wing, multi-engine | Clean Waste Solutions LLC Indianapolis, Indiana |
Standard | 2025-09-25 | ValidFAA registration status code V: Valid registration. All codes |
| N3117K | Piper PA-32R-301T |
Fixed-wing, single engine | Degatech Systems INC Van Nuys, California |
Standard | 2025-09-24 | ValidFAA registration status code V: Valid registration. All codes |
| N390AS | Piper PA-23-250 |
Fixed-wing, multi-engine | Ocala Aviation Services INC Ocala, Florida |
Standard | 2025-09-24 | ValidFAA registration status code V: Valid registration. All codes |
| N4505X | Piper PA-32R-300 |
Fixed-wing, single engine | Black Hound Aviation LLC Austin, Texas |
Standard | 2025-09-24 | ValidFAA registration status code V: Valid registration. All codes |
| N1069X | Piper PA-32-300 |
Fixed-wing, single engine | Entelechy One LLC Wichita, Kansas |
Standard | 2025-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N638RJ | Mooney M20M |
Fixed-wing, single engine | Euroaviation INC Trustee Kematen, |
Standard | 2025-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N810KC | Piper PA-32R-301T |
Fixed-wing, single engine | Individual owner Georgia |
Standard | 2025-09-23 | ValidFAA registration status code V: Valid registration. All codes |
| N70846 | Piper PA-23-250 |
Fixed-wing, multi-engine | Dc Aero LLC Ramona, California |
Standard | 2025-09-22 | ValidFAA registration status code V: Valid registration. All codes |
| N9913R | Piper PA-24-260 |
Fixed-wing, single engine | Bridges James Chico, Texas |
Standard | 2025-09-22 | ValidFAA registration status code V: Valid registration. All codes |
| N100EM | Piper PA-31-350 |
Fixed-wing, multi-engine | Kentem100 LLC Asheboro, North Carolina |
Standard | 2025-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N31795 | Piper PA-32RT-300T |
Fixed-wing, single engine | Kshr Av8Rs LLC Sheridan, Wyoming |
Standard | 2025-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N4096W | Piper PA-32-300 |
Fixed-wing, single engine | Cruisers Pacific LLC Discovery Bay, California |
Standard | 2025-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N6716Y | Piper PA-23-250 |
Fixed-wing, multi-engine | Got Wings LLC Woodbury, New York |
Standard | 2025-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N7742V | Aero Commander CALLAIR A-9B |
Fixed-wing, single engine | Individual owner Missouri |
Restricted | 2025-09-20 | ValidFAA registration status code V: Valid registration. All codes |
| N92821 | Piper PA 46-350P |
Fixed-wing, single engine | Aerinova INC Mattoon, Illinois |
Standard | 2025-09-17 | ValidFAA registration status code V: Valid registration. All codes |
| N4141G | Piper PA 46-350P |
Fixed-wing, single engine | Co-owned owner Pennsylvania |
Standard | 2025-09-16 | ValidFAA registration status code V: Valid registration. All codes |
| N56285 | Piper PA-32-300 |
Fixed-wing, single engine | Knots and Attitudes LLC Wimberley, Texas |
Standard | 2025-09-16 | ValidFAA registration status code V: Valid registration. All codes |
| N6353Y | Piper PA-23-250 |
Fixed-wing, multi-engine | Alpine Aviation LLC Oasis, Idaho |
Standard | 2025-09-16 | ValidFAA registration status code V: Valid registration. All codes |
| N893CB | Piper PA-31-325 |
Fixed-wing, multi-engine | Aec Navajo LLC Wilmington, Delaware |
Standard | 2025-09-15 | ValidFAA registration status code V: Valid registration. All codes |
| N84008 | Piper PA-28RT-201T |
Fixed-wing, single engine | Individual owner North Carolina |
Standard | 2025-09-13 | ValidFAA registration status code V: Valid registration. All codes |
| N4203R | Piper PA-32-300 |
Fixed-wing, single engine | Individual owner Illinois |
Standard | 2025-09-12 | ValidFAA registration status code V: Valid registration. All codes |
| N4159W | Piper PA-32-300 |
Fixed-wing, single engine | Northern Sky Aviation LLC Howard Lake, Minnesota |
Standard | 2025-09-11 | ValidFAA registration status code V: Valid registration. All codes |
| N568MC | Cessna T182T |
Fixed-wing, single engine | Individual owner Wyoming |
Standard | 2025-09-11 | ValidFAA registration status code V: Valid registration. All codes |
| N8907N | Piper PA-32-300 |
Fixed-wing, single engine | Individual owner Tennessee |
Standard | 2025-09-11 | ValidFAA registration status code V: Valid registration. All codes |
| N4216R | Piper PA-32-300 |
Fixed-wing, single engine | Co-owned owner Illinois |
Experimental | 2025-09-10 | ValidFAA registration status code V: Valid registration. All codes |
| N737EB | Cessna T182T |
Fixed-wing, single engine | Vx Ventures LLC Castle Rock, Colorado |
Standard | 2025-09-08 | ValidFAA registration status code V: Valid registration. All codes |
| N8218K | Piper PA-32R-301T |
Fixed-wing, single engine | N8218K LLC Chico, California |
Standard | 2025-09-06 | ValidFAA registration status code V: Valid registration. All codes |
| N317HA | Piper PA-31-325 |
Fixed-wing, multi-engine | Bauer Aviation LLC Saint Germain, Wisconsin |
Standard | 2025-09-05 | ValidFAA registration status code V: Valid registration. All codes |
Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.