1.
When flying on a long-range flight, it is recommended to collect data at different gross weight/altitude combinations whenever possible (high gross weight/low altitude at the beginning of a flight, low gross weight/high altitude at the end of a flight).
2.
A visual inspection of spoilers, ailerons, slats and flaps position can be conducted in cruise, to detect any possible aerodynamic disturbance which could increase aircraft apparent drag.
3.
It is recommended not to start recording before 15 minutes after the top of climb, in order to avoid transient engine behaviors.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
HOW TO RECORD IN-FLIGHT PARAMETERS
3.1.4. Data Recording
Data recording will be carried out during at least 6 minutes if favorable stability conditions are maintained.
Data recordings samples will be validated considering the following stability criteria:
-Delta pressure altitude: .Zp ≤ ± 20 ft
-Delta static air temperature: .SAT ≤ ± 1°C .GS
-Delta Ground Speed to delta time ratio: ≤1kt / min
.t -Delta Mach Number: .Mach ≤ ± 0.003.
-Drift angle less than 5 degrees
The following parameters will be recorded at the rate specified in the table below:
Parameter Note at intervals of Parameter Note at intervals of
- Altitude (Zp) -Mach (M) / TAS -TAT / SAT -N1 (or EPR) -CG and rudder trim 60 seconds 60 seconds 60 seconds 60 seconds 60 seconds - Fuel flow (FF) -EGT -Fuel used (FU) -Ground speed (GS) 60 seconds 60 seconds 60 seconds 60 seconds (check every 30 seconds for variations)
In addition the approaching station will be noted, as well as the drift angle. The drift angle is a triggering condition used to assess one record. Heading, wind velocity and direction, track will be also monitored so as to determine their respective impact due to the Coriolis effect. The latter is an optional step as the Coriolis effect is of a second order effect.
Do not forget to consult weather charts (forecasted and actual ones) to confirm actual pressure patterns.
3.2. Forms for manual reading
When collecting data manually in the cockpit, a number of data has to be written
down in a short period of time so as to constitute a complete record.
The following pages show some pre-formatted forms are available to properly
record the data:
-a check list of what to do before flight,
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