getting to grips with aircraft performance monitoring(43)

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-The year of recording may not be stored in reports for some aircraft type. The year should then be provided for the analysis and for history purposes.
-When the parameters are automatically recorded thanks to the DMU/FDIMU, non relevant points are simply eliminated (for instance, points which are recorded below FL200 are not taken into account). It may happen that such points are recorded due to DMU/FDIMU malfunctions. As a consequence, particular attention is required so as to assess the validity of each particular point. This check is often performed when a discrepancy in the cruise performance analysis is noticed on a few points.
The analysis of the resulting points can be performed with an Airbus specific tool, based on the specific range method: the APM program. Airbus has implemented a specific routine that allows automatic loading of cruise performance reports number 02, when in digital format.
Statistical elimination can be selected before the actual analysis with the APM program. For each parameter (fuel flow, N1/EPR,…), the mean value and the standard deviation is calculated over all the records. The user can then filter the records so as to get rid of inappropriate low quality readings. Two filters are implemented in the APM program: -standard elimination which discards the points which are outside a 95%-
confidence interval
-pre-elimination window which enables the user to eliminate the parameters which are outside a user’s defined window, which is centered on the mean value
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

CRUISE PERFORMANCE ANALYSIS

D. CRUISE PERFORMANCE ANALYSIS
Several Airbus tools are available to perform cruise performance analysis. The Airbus Aircraft Performance Monitoring (APM) program comes first for routine aircraft performance monitoring due to the amount of data to process. Indeed, this program features a DMU/FDIMU report loading function, which relieves from tedious handling operations.
Some other Airbus tools (the IFP program…) are available for these analyses and may be used. The tool choice is at the airline's discretion.
The following lines deal with the software aspect of cruise performance analysis. The pre-requisite for this chapter is a basic comprehension of how to get the parameters from the aircraft, as well as general background on the specific range method itself.
1. THE BOOK LEVEL
As a reminder, the aircraft performance book level is established by the aircraft manufacturer and represents a fleet average of brand new aircraft and engines. This level is established in advance of production and is derived from flight tests. Normal scatter of brand new aircraft leads to performance above and below the book value. The performance data given in the Airbus documentation (Flight Crew Operating Manual) reflects this book value.
The high-speed book value data is stored in the high-speed performance databases used by Airbus performance software such as the IFP, the FLIP or the APM programs. This aircraft Performance model is built based on results from extensive performance flight tests: the IFP model. Most of the Computerized Flight Plan systems as well as the published Performance tables in the Flight Crew Operating Manual and in the Quick Reference Handbook use the IFP model.
　
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