scholarly journals Microstructural Characterization of Failed Aircraft Antenna

2018 ◽  
Vol 3 (4) ◽  
pp. 171-181
Author(s):  
Premkumar Manda ◽  
A Sambasiva Rao ◽  
Satyapal Singh ◽  
Ashok Kumar Singh
Keyword(s):  
Collision Avoidance ◽  
Traffic Control ◽  
Microstructural Characterization ◽  
Aircraft Engine ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
External Objects ◽  
Large Particles ◽  
Collision Avoidance System

This paper presents the failure analysis of aircraft antenna which is a sub-assembly of Traffic Collision Avoidance System (TCAS) used with Air Traffic Control (ATC) transponder. The base of the damaged antenna (metallic part) is made from Al-based alloy. The micrographs exhibit the typical solidification microstructure consisting of Al-rich matrix along with Si- and Mg-Si-Fe- rich phases. The antenna is coated with the paint consisting of three layers. First and third layers display the presence of Ti and C while second layer consists of Si, Cr and C elements. The small amount of oxygen is also present in all the three layers. The cracks are appeared in the central region of the fin due to impact of external objects (appears to be blankings and particles). Three types of foreign object damage particles are observed on the damaged / hit area. The antenna appears to be damaged during gale as a result of hitting of the large particles lying in aircraft parking area and aircraft engine blankings.

Why Air Traffic Control?

1961 ◽  
Vol 65 (606) ◽  
pp. 416-418
Author(s):  
R. F. Hansford
Keyword(s):  
Collision Avoidance ◽  
Traffic Control ◽  
Air Traffic Control ◽  
Air Traffic ◽  
Technical Problems ◽  
The Future ◽  
Collision Avoidance System

To avoid any misunderstandings, it should be made clear that in the author's opinion the techniques of Air Traffic Control are not likely to be significantly affected by the future advent of an air-to-air collision avoidance system. This is admittedly a contentious view and this paper is a brief survey of some of the factors which lead the author to hold this opinion. After clarifying what is meant by an air-to-air collision avoidance system, the paper deals first with some of the operational problems, then with some of the technical problems and concludes with general comments.

Microstructural characterization of a Cr2Nb-Nb(Cr) microlaminate composite

1994 ◽  
Vol 52 ◽  
pp. 706-707
Author(s):  
M. Larsen ◽  
R. G. Rowe ◽  
D. W. Skelly
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Metal Layer ◽  
Intermetallic Layer ◽  
Weight Ratio ◽  
Microstructural Characterization ◽  
Aircraft Engine ◽  
Intrinsic Defect ◽  
Lamellar Thickness

The thrust to weight ratio of an aircraft engine is limited by the density and elevated temperature performance of high temperature structural materials. Many material systems are currently under investigation as potential next generation engine materials. Microlaminate composites consisting of alternating layers of a ductile refractory metal for toughening and a high temperature intermetallic compound for elevated temperature strength have applicability in aircraft engine turbines. The lamellar thickness of such a composite must be small because the intrinsic defect size, a crack across the intermetallic layer, will be controlled by the intermetallic layer thickness. The microstructural characterization of a Cr2Nb-Nb(Cr) microlaminate composite produced by Magnetron® sputtering was carried out by cross-sectional TEM. Both the as-deposited composite and one heat treated at 1200°C for two hours were examined.Figure 1 shows a micrograph of the as-deposited composite. The metal and intermetallic layers are 2um thick. The metal layer has a composition in atomic percent of 95% Nb and 5% Cr.

Characterization of Expert Drivers' Last-Second Braking and Its Application to a Collision Avoidance System

2010 ◽  
Vol 11 (2) ◽  
pp. 413-422 ◽  
Author(s):  
Takahiro Wada ◽  
Shun'ichi Doi ◽  
Naohiko Tsuru ◽  
Kazuyoshi Isaji ◽  
Hiroshi Kaneko
Keyword(s):  
Collision Avoidance ◽  
Collision Avoidance System

Assessment and Rehabilitation of Foreign Object Damage Potential on Airfield Shoulder and Blast Pavements

2005 ◽  
Vol 1915 (1) ◽  
pp. 105-111
Author(s):  
Katherine Keegan ◽  
Scott D. Murrell ◽  
Guy Zummo ◽  
Gonzalo Rada
Keyword(s):  
New York ◽  
Flight Control ◽  
Aircraft Engine ◽  
Rehabilitation Program ◽  
Pavement Management ◽  
Aviation Industry ◽  
Foreign Object ◽  
Damage Potential ◽  
Foreign Object Damage ◽  
Pavement Maintenance

Foreign object damage (FOD) is a term used by the aviation industry to describe damage caused by any object that can be ingested by an aircraft engine or flight control mechanism. FOD is estimated to cost the global aerospace industry up to $4 billion annually. Deteriorated pavements are one source of FOD and fall into two categories: runway, taxiway, and apron pavements that aircraft traverse and shoulders and other infield pavements that are not traversed but are subjected to jet blast. Widely recognized procedures for the assessment of pavements traveled on by aircraft are well documented. However, procedures for the assessment of FOD potential for shoulder and blast pavements at commercial airports are not widely recognized. In an effort to manage shoulder and blast pavements proactively and eliminate pavement-related FOD incidents, the Port Authority of New York and New Jersey undertook to assess the current condition of these pavements, rehabilitate and repair areas with unacceptable FOD potential, and initiate periodic inspections on these pavements to facilitate the implementation of an effective pavement maintenance and rehabilitation program. To achieve this goal, a dual project- and network-level inspection approach was implemented. The project-level objective was to identify immediate repairs needed to address unacceptable FOD potential. The network-level objective was to assess the current condition and initiate a proactive inspection regime to assist in maintaining these pavements. The approaches to assessment and rehabilitation are detailed and steps to implement a pavement management system for these pavements are discussed.

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