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Step & Repeat: Reduce Derivative Aircraft Development Risk with Design Reuse

Mentor, A Siemens Business-Muhammad Askar
  • Technical Paper
  • 2019-01-1871
To be published on 2019-09-16 by SAE International in United States
Designing derivative aircraft is a complex process with potentially large amounts of program risk. In this paper we present new technologies such as digital interface control documents, and generative design that can transform this process. Employing these types of technologies makes the process more verifiable and repeatable. The paper explains how the technologies can be adopted from the early definition of components & LRUs, to their aggregation into reusable subsystems, as well as the automation and validation processes that can be built around them to reduce the associated complexity and program risk.
 

Reconfigurable Jig Tooling and In-Process Metrology for High Accuracy Prototype Compound Helicopter Wing Assembly

University of Nottingham-Richard J. Crossley
  • Technical Paper
  • 2019-01-1877
To be published on 2019-09-16 by SAE International in United States
This paper documents the potential use of reconfigurable reusable jig tooling based on the box-joint system for use in the assembly of a prototype compound helicopter wing. Due to the aircraft configuration the wing design is pinned at both ends and therefore requires a higher degree of accuracy (typically 0.2mm), over the 4m length, than conventional wings. In this paper the cost benefit of reusable tooling in a low volume prototype scenario is examined followed by the design of the jig and location features to enable accurate build and metrology documentation. A prototype 4m test jig comprising of commercially available components and bespoke machined ‘pick-ups’ is presented here. Hardware and measurement process cost modelling is documented along with results for the positional and hinge-line concentricity setting accuracy that was achieved using a laser tracking system. Subsequent measurements over a 24hr period are also discussed along with potential sources of the observed reduction in jig accuracy over time.
 

Investigation into the benefits of implementing a fully integrated MRO Software system in Airlines Maintenance and Engineering

SORT Engineering GmbH-Adel A. Ghobbar
  • Technical Paper
  • 2019-01-1908
To be published on 2019-09-16 by SAE International in United States
Case studies of various MRO organizations were researched in order to gain a better understanding of the business procedures used in each department of an aircraft maintenance company. The software systems available to aid business processes were researched to understand the computer processes, functions and operational requirements of these software programs. The planning and scheduling of inventory and manpower resources is complex and requires various parameters to be computed by the software systems in order to adequately plan the necessary aircraft maintenance resources. Case studies of aircraft maintenance companies that previously implemented integrated IT software solutions to control and monitor department functions were researched to identify and understand the various problems encountered by these companies during the software implementation phase. Understanding the problems that could potentially occur during the implementation is necessary to ensure similar mistakes are not repeated. The improvements and gains to efficiency that can be expected once the integrated IT system is operational were also considered. The work flow processes in the Brussels Airlines MRO Stores (incoming inspection) and Maintenance Planning departments…
 
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INSTALLING AND REMOVAL TOOLS, CONNECTOR ELECTRICAL CONTACT, TYPE I, CLASS 1, COMPOSITION A

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS81969/33
  • Current
Published 2019-06-14 by SAE International in United States
No Abstract Available.
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INSTALLING AND REMOVAL TOOLS, CONNECTOR ELECTRICAL CONTACT, TYPE II, CLASS 1, COMPOSITION A (FOR MIL-DTL-28840 CONNECTORS)

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS81969/34
  • Current
Published 2019-06-14 by SAE International in United States
No Abstract Available.
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National Names Phrase List

V2X Core Technical Committee
  • Ground Vehicle Standard
  • J2540/3_201906
  • Current
Published 2019-06-11 by SAE International in United States

This SAE Standard provides a table of textual messages meeting the requirements for expressing the names of street and roads and some basic building blocks for phrases commonly used in the ITS industry. The tables provided herein are taken from SAE J2369, and follow the rules of SAE J2540 and therefore allow a local representation in various different languages, media expressions, etc. to allow true international use of these phrases. The phrases are predominantly intended to provide a means to express street names including pre and post fixes (North Oak Street is an example name with a prefix "North" and main portion "Oak" and a suffix "Street"). Other phrases exist for other specific specialty areas of ITS, and all such phrases follow a set of encoding and decoding rules outlined in SAE J2540 to ensure that the use of these phrases in messages remain interoperable between disparate types of user equipment.

 
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Message Sets for Advanced Traveler Information System (ATIS)

V2X Core Technical Committee
  • Ground Vehicle Standard
  • J2354_201906
  • Current
Published 2019-06-11 by SAE International in United States

This SAE Standard describes standardized medium-independent messages needed by information service providers for Advanced Traveler Information Systems (ATIS). The messages contained herein address all stages of travel (pre-trip and en-route), all types of travelers (drivers, passengers), all categories of information, and all platforms for delivery of information (in-vehicle, portable devices, kiosks, etc.).

 
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Type IV Anti-Icing Fluid Subjected to Light Freezing Rain: Visual and Thermal Analysis

UQAC - AMIL-Jean-Denis Brassard, Caroline Laforte, Christophe Volat
Published 2019-06-10 by SAE International in United States
Deicing the aircraft using fluid, prior takeoff is mandatory; since a thin layer of ice or snow can compromise the safety. With the same idea, to use anti-icing fluid during a frozen precipitation to protect the aircraft is also essential. Commercialized anti-icing fluids all pass the process of qualification as described in the SAE documents. One of these documents specifies a set of tests that reproduce freezing precipitation to obtain endurance time and then the holdover timetables. The endurance time is determined by visual inspection: when 30% of the plate is covered with frozen contaminants. With the evolution of technology and the venue of new tools, it may simplify the process, and at least confirm the observations. This paper proposed a thermal and visual analysis of the behavior of a Type IV fluid subjected to light freezing rain. During the precipitation, the plate temperature is measured with thermocouples and recorded using a visual camera and an IR camera. The use the visual camera in conjunction with the IR camera allowed to understand how the water…
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The Influence of SLD Drop Size Distributions on Ice Accretion in the NASA Icing Research Tunnel

NASA John Glenn Research Center-Mark G. Potapczuk
Ohio Aerospace Institute-Jen-Ching Tsao
Published 2019-06-10 by SAE International in United States
An ice shape database has been created to document ice accretions on a 21-inch chord NACA0012 model and a 72-inch chord NACA 23012 airfoil model resulting from an exposure to a Supercooled Large Drop (SLD) icing cloud with a bimodal drop size distribution. The ice shapes created were documented with photographs, laser scanned surface measurements over a section of the model span, and measurement of the ice mass over the same section of each accretion. The icing conditions used in the test matrix were based upon previously used conditions on the same models but with an alternate approach to evaluation of drop distribution effects. Ice shapes resulting from the bimodal distribution as well as from equivalent monomodal drop size distributions were obtained and compared. Results indicate that the ice shapes resulting from the monomodal and bimodal drop size distributions had similar shapes, but the bimodal distributions had greater mass and volume measurements and icing limits that extended further back on the chord of the model.
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Machining Titanium Aero-Frames

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_11
Published 2019-06-01 by SAE International in United States

The rise of titanium for aerospace applications has been well documented in recent years. Equally, the challenges associated with the efficient, productive and high-quality machining of this popular material, have also been a topic of debate and scrutiny. Of course, every machine shop wants optimized performance from its cutters when milling titanium, but this can prove less than straightforward without the right technology and know-how in place. Today, however, thanks to a breakthrough in this area, things are beginning to change.

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