Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
HOW TO RECORD IN-FLIGHT PARAMETERS
The correspondence between this file and the standard report can be obtained by
tracking the lines identifiers. For instance, the aircraft registration is identified as
A/C in the standard report. It is written on line CC.
In the ACARS-transmitted file, the first characters are:
- A02/A32102,1,1/CCAI-002 […]
Each data is separated by a comma “,”. After a slash “/”, the line identifier is written. So in this record, we can read AI-002 is the aircraft registration.
4.4.2.3. Report specification
Both Print-like report and ACARS report have been defined in accordance with a specification.
The exhaustive description of the print-like file is given to the operators in another part of the Airbus documentation, the Aircraft Maintenance Manual (AMM) in section 31-36-00. Read Chapter H-Appendix 5 – AMM extracts, Cruise Performance Report <02> description.
As far as the ACARS format is concerned, no specification is made available to the customers. Airbus is ready to provide such a description of the ACARS report upon request.
4.4.3. The trigger logic
A trigger logic is a set of conditions checked before the DMU/FDIMU generates a report. There are several trigger logics for the cruise performance report <02>. For example, one is for the manual selection via the MCDU; another one is for the use of the remote print button as an order for the data collection. In particular, trigger logic n°5000 (or 4000 depending on the aircraft model) is called the best stable frame report logic. This trigger logic aims at detecting stable flight conditions in order to avoid report triggering in flight phases where parameters are of no use. Airbus recommends the use of these reports for aircraft performance-monitoring purposes.
The AIDS/ACMS Cruise Performance report <02> is generated when the DMU/FDIMU detects that the conditions defining a stable cruise are met. When the cruise flight phase is reached, this stability searching is made by monitoring some aircraft parameters. When the variation of all these parameters are within a range defined for each one of them during a customizable time-period, then the stable cruise conditions are met and the report is generated. If the conditions are not met, the report <02> will not be generated. Note that the operator is not allowed to change any of the trigger limits.
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