ICASC_Paper_on_Flight_inspection_Intervals_IFIS_template_issue_1doc.doc

Quality of maintenance doc 8071 1 1154 1158 e mention

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Quality of Maintenance Doc 8071 [1] §1.15.4 & §1.15.8 e) mention the need to consider the quality of maintenance, but does not state what constitutes good quality maintenance. When extending a Flight Inspection Interval an assessor should consider the following items to ensure that the maintenance is of a good quality: Experience d engineers Well formed maintenanc e regime Reviews of ground and flight inspection results Recording monitor readings Keeping record of adjustment Cooperatio n between ground and flight department A Quality Manageme nt System in place Closer Tolerances [1] §1.15.13 Tolerances may be developed setting stricter criteria which define the exact value to initiate investigation or adjustment of a particular parameter. Using closer tolerances to initiate adjustment back to its nominal value can help give confidence that the Signal in Space will remain within the acceptance standard for the duration of the flight inspection interval. An example is given in Doc 8071 [1] §1.15.8 a) using 75 % of the nominal acceptance standard. Italy has a policy of readjusting critical ILS parameters to close-to-nominal values (Localiser alignment and width, glide path angle and width) if they are found outside the 50% of maximum allowed by ICAO documents”. DUE DATE WINDOW Doc 8071 3rd Edition [2] provided a due date window on the flight inspection interval i.e. +/- 15 days for periodic inspection and +/- 60 days for annual inspections. The 4th Edition removed these windows. As can be seen from Table 1, many states still use a due date window as part of their inspection regime. A due date window should be considered as a period of time in which the inspection should be completed if it has not been operationally possible to conduct the inspection on or before the due date. For example, if the inspection has been delayed due to poor weather conditions. A due date window is a useful tool for tactical planning of flight inspection missions, improving the efficiency of flight inspection operations. When the inspection is undertaken within the due date window the next inspection can still be performed at the next planned date, meaning that it would not be necessary to change the long term planning of the flight inspection schedule. The due date window is not designed as a means to systematically extend the flight inspection interval. The due date window should be considered as part of the overall inspection interval, it should not be so long as to significantly increase the risk of the Signal in Space drifting out of tolerance. Table 1 gives examples of due date windows applied by ICASC represented countries. The absence of clear specified guidance in Doc 8071 [1] opens the way for various interpretations and figures to be used.
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