# US 2015/0144201 A1 · Engine inlet duct installation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144201 A1 - Document ID: US20150144201A1 - Status: Published application - Kind: A1 - Application number: 14/088,539 - Filed: 2013-11-25 - Published: 2015-05-28 - Earliest claimed: 2013-11-25 - Assignees: Sikorsky Aircraft Corporation - Applicants: Sikorsky Aircraft Corporation - Inventors: Scott A. Chasen - Web page: https://patentgrep.com/patent/US20150144201A1 ## CPC - F02C 7/04: Air intakes for gas-turbine plants or jet-propulsion plants - B64D 33/02: of combustion air intakes - F02C 7/32: Arrangement, mounting, or driving, of auxiliaries - F16B 5/07: by means of multiple interengaging protrusions on the surfaces, e.g. hooks, coils, - F16B 21/09: Releasable fastening devices with a stud engaging a keyhole slot - F16B 43/009: {with a wedging effect in order to adjust the height of the washer} - F05D 2220/329: in helicopters - F05D 2230/60: Assembly methods - F05D 2260/30: Retaining components in desired mutual position - Y10T 29/49947: by applying separate fastener - Y10T 29/49948: Multipart cooperating fastener [e.g., bolt and nut] - Y10T 137/0536: Highspeed fluid intake means [e.g., jet engine intake] - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method of securing two components to each other includes locating a mounting strip at a first mounting flange of a first component. The mounting strip is slidably affixed to the first component and includes a plurality of strip openings and a tightening ramp located at each strip opening of the plurality of strip openings. A second component is located such that a second mounting flange of the second component abuts the first mounting flange. A plurality of fasteners are located at the second mounting flange. A fastener of the plurality of fasteners extends through each strip opening of the plurality of strip openings. The mounting strip is slid in a direction to increase tension on the plurality of fasteners via an increasing height of the tightening ramp under a fastener head of the fastener, thereby securing the first mounting flange to the second mounting flange. ## Claims ### Claim 1 A method of securing two components to each other comprising: locating a mounting strip at a first mounting flange of a first component, the mounting strip slidably affixed to the first component and including: a plurality of strip openings; and a tightening ramp located at each strip opening of the plurality of strip openings: locating a second component such that a second mounting flange of the second component abuts the first mounting flange, a plurality of fasteners located at the second mounting flange, a fastener of the plurality of fasteners extending through each strip opening of the plurality of strip openings; and sliding the mounting strip in a direction to increase tension on the plurality of fasteners via an increasing height of the tightening ramp under a fastener head of the fastener, thereby securing the first mounting flange to the second mounting flange. ### Claim 2 (depends on 1) The method of claim 1, wherein sliding the mounting strip comprises: extending a tightening bolt of the mounting bracket through a stop; and tightening a nut disposed at the stop over the bolt to urge the mounting bracket toward the stop. ### Claim 3 (depends on 1) The method of claim 1, wherein sliding the mounting strip increases a tightening ramp height between a fastener head and the second mounting flange to increase the tension on the fastener. ### Claim 4 (depends on 1) The method of claim 1, wherein a strip opening of the plurality of strip openings has a keyhole shape. ### Claim 5 An inlet duct assembly comprising: a first inlet duct leg, the first inlet duct leg including: a first mounting flange; and a fastener extending from the first mounting flange, the fastener having a fastener head disposed at a preselected distance from the mounting flange; a second duct leg including: a second mounting flange configured to abut the first mounting flange; a slidably located mounting strip having: a strip opening, the fastener extending therethrough; and a tightening ramp having an increasing height in one direction; wherein sliding the mounting strip along the second mounting flange increases a tension on the fastener and thus secures the first mounting flange to the second mounting flange. ### Claim 6 (depends on 5) The inlet duct assembly of claim 5, further comprising: a tightening bolt extending from one end of the mounting strip; a stop disposed at the second mounting flange; and a tightening nut disposed at the stop, such that tightening the tightening nut over the tightening bolt urges sliding of the mounting strip toward the stop. ### Claim 7 (depends on 5) The inlet duct assembly of claim 5, wherein the tightening ramp has increasing height with distance from the stop. ### Claim 8 (depends on 5) The inlet duct assembly of claim 5, wherein sliding the mounting strip increases a height of tightening ramp between the fastener head and the second mounting flange. ### Claim 9 (depends on 5) The inlet duct assembly of claim 5, wherein the fastener is one of a bolt, screw or pin. ### Claim 10 (depends on 5) The inlet duct assembly of claim 5, wherein the first inlet duct leg and/or the second duct leg are secured to an airframe. ### Claim 11 (depends on 5) The inlet duct assembly of claim 5, wherein the strip opening has a keyhole shape. ### Claim 12 A method of installing an inlet duct assembly to a rotary winged aircraft comprising: locating a first inlet duct leg at an engine inlet of a rotary winged aircraft, the first inlet duct leg including: a first mounting flange; and a fastener extending from the first mounting flange, the fastener having a fastener head disposed at a preselected distance from the mounting flange; locating a second inlet duct leg at the engine inlet such that a second mounting flange of the second inlet duct leg abuts the first mounting flange, the second inlet duct leg including a slidably located mounting strip having: a strip opening, the fastener extending therethrough; and a tightening ramp having an increasing height in one direction; and sliding the mounting strip to increase tension on the fastener thereby securing the second mounting flange to the first mounting flange. ### Claim 13 (depends on 12) The method of claim 12, wherein sliding the mounting strip comprises: extending a tightening bolt of the mounting bracket through a stop; and tightening a nut disposed at the stop over the bolt to urge the mounting bracket toward the stop. ### Claim 14 (depends on 12) The method of claim 12, wherein sliding the mounting strip increases a tightening ramp height between a fastener head and the second mounting flange to increase the tension on the fastener. ### Claim 15 (depends on 12) The method of claim 12, wherein the fastener is one of a bolt, screw or pin. ### Claim 16 (depends on 12) The method of claim 12, wherein the first inlet duct leg and/or the second duct leg are secured to an airframe. ### Claim 17 (depends on 12) The method of claim 12, wherein the ramped strip is fixed to the flange of the second inlet leg rather than made slideable. The two legs of each inlet half are then moved relative to one another to slide the fastener head of the first inlet duct up the ramp strip on the second inlet duct leg. ### Claim 18 (depends on 12) The method of claim 12, wherein the strip opening has a keyhole shape.