ICASC_Paper_on_Flight_inspection_Intervals_IFIS_template_issue_1doc.doc

Stripline and microstrip circuit technology for

Info icon This preview shows pages 7–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Stripline and microstrip circuit technology for antenna distribution and monitoring rather than discrete component s connected by coaxial cables Improved coaxial cables for both transmit and monitor antenna feed cables (with air/gas and foam core dielectric materials which provide much better performanc e over temperature than Teflon and plastic dielectric cables) Extent of Ground Monitoring [1] §1.15.6 The term ground monitoring referred to in [1] §1.15.4 is considered to mean ground maintenance activities as described in [1] §1.15.6. It is not associated with Navigation Aids internal monitoring systems. Doc 8071 [1] recognises that the overall inspection regime for a navigation aid consists of both ground and flight Inspection. There is a balance between ground and flight inspection to ensure the Signals in Space remain within the ICAO tolerances. There is an obvious limit to the extent that ground maintenance can be used to confirm that the Signals in Space as presented to an aircraft are acceptable. Some states restrict the adjustment of the safety critical parameters without a flight inspection or establish ground maintenance methods to verify that the equipment is operating within clearly defined specifications. Ground measurements of the transmitting equipment can help ensure that the radiating signal generation had not changed since the last inspection. Measurement of the following parameters should be considered as part of an overall maintenance regime: Phasing Transmitter output power Modulation depth Modulation balance Ground measurements conducted in the field especially the far field can provide confidence that the radiated signal has not deviated from the previous inspection. These ground measurements consist of measuring the alignment, width and clearance at specified points. Degree of Correlation Between Ground and Flight Inspections [1] §1.15.7 Correlation between ground and airborne measurements is one of the main factors to consider for the extension of a flight inspection interval. Correlation provides confidence that the ground measurements are representative of the flight inspection measurements. The initial ground and flight inspection measured values may not be identical because of the different position in space where the measurement are made, however there should be suitable correlation to monitor any drift of the signal in space. Doc 8071 [1] §1.15.10 to 1.15.14 gives some good guidance on the things to consider to ensure good correlation is achieved and maintained, namely: Preliminary requirement s Techniques Tolerances, Activities during flight inspection For more than 30 years, France has been carrying out ILS flight inspection activities utilising correlation between airborne and ground
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
measurements; this has enabled the ILS flight inspection interval to be extended from six months to one year.
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern