3. HOW TO GET THE IFP & APM PROGRAMS
The APM program is part of the Performance Engineers’ Package (PEP), which
includes a number of performance software.
The package is available for all Airbus aircraft types and can be customized
depending on individual needs.
It can run on many computer platforms to satisfy the airlines’ particular needs.
These platforms are:
-Personal computers equipped with Microsoft Windows.
-Mainframes (IBM-MVS/VM systems…)
-Unix workstations
The PEP is a software mostly used by airlines’ Engineering and/or Flight Operations. Airbus Flight Operations & Line Assistance department is responsible for the dispatch and the maintenance of this software. The contact address for this is:
CUSTOMER SERVICES DIRECTORATE
Flight Operations & Line Assistance - STL
1, rond point Maurice Bellonte
BP33
31707 BLAGNAC Cedex
FRANCE
Fax : + 33 (0) 5 61 93 2968/44 65
TELEX : AIRBU 530526 F
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
RESULTS APPRAISAL
E. RESULTS APPRAISAL
1. INTRODUCTION
This chapter deals with the way to relate the results of the cruise performance analysis to a practical interpretation and gives hints at understanding where the apparent deterioration that is measured on an aircraft may come from and, in some cases, gives recommendations to actually improve the aircraft’s condition.
The following is focusing on results obtained with the APM program. The pre-requisite for this chapter is a good knowledge of the APM program and of the output data that it can produce. More details on that subject are given in Chapter D-Cruise performance analysis.
As a reminder, the APM output data are: -DSR represents aircraft performance degradation (in %), in terms of Specific Range degradation. -DFFBx is the deviation of fuel flow due to the engine deterioration (engine number x). -DFFAx is the deviation of fuel flow due to the "apparent" airframe deterioration (DFFAx is equivalent to a delta of drag) linked to engine number x. -DN1x (resp. DEPRx) is the deviation of N1 (resp. EPR) for engine number x to maintain flight conditions.
2. INTERPRETING THE APM OUTPUT DATA
As a reminder, the purpose of the APM program is to compare the actual aircraft performance level versus the book level. The following lines give the possible conclusions when interpreting the output data.
Figure E1 reminds the APM principle.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
RESULTS APPRAISAL
Figure E1 - APM principle
The above figure proves that a positive N1/EPR deviation results in a positive DFFA.
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