Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
HOW TO RECORD IN-FLIGHT PARAMETERS
3. MANUAL RECORDING
Manual readings have to be performed when the aircraft is not equipped with the appropriate equipment required for automated data retrieval. The required material is detailed in the next paragraph.
Doing manual readings requires to comply with strict rules to avoid irrelevant points. Some highlights will also be given concerning analysis procedures and the use of recording systems.
3.1. Measurement procedures and precautions
A performance monitoring must be carried out considering all the following measurement procedures and precautions.
These recommendations have been summarized in the form given at the end of this paragraph.
3.1.1. At dispatch
- Take a copy of the computerized flight plan, the weather forecast and of the load sheet.
- Take a fuel sample from the refueling truck for analysis and determination of the fuel LHV. The FLHV of the sample can be determined by specialized laboratories.
- Check the external aspect of the aircraft to detect any seal degradation, any flight control surface and door misrigging, any airframe repair, the airframe surface condition, which all could increase the aircraft drag. Take pictures and annotate aircraft schematics to detail observations.
- Note aircraft tail number, date and flight sector.
3.1.2. Prior to take off
- Record the fuel on board (FOB) at Main Engine Start (MES), either by the on-board fuel quantity indication (FQI).
- Note Zero Fuel Weight (ZFW) from the load sheet.
- Calculate aircraft gross weight at MES (read it on the ECAM).
- Note APU running time after MES and compute APU fuel consumption to amend engine fuel used (100 / 150 kg / hour).
- Note the take off Center of Gravity
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
HOW TO RECORD IN-FLIGHT PARAMETERS
3.1.3. In flight
-Check the aircraft is flying in cruise on a straight leg that will take at least 15 minutes.
-Perform fuel balancing if unbalance between wing tanks exists. Check fuel unbalance is not due to a fuel leak.
-Disconnect autothrust and set N1/EPR at an appropriate value to maintain a constant speed
-Do not touch the thrust levers during the whole subsequent period unless recordings are stopped because of instability.
-Engage autopilot in ALT HLD/HDG SEL mode.
-Select air conditioning flow normal, both bleeds packs ON, engine anti-ice OFF, wing anti-ice OFF.
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