APPENDICES
2.2.2. In flight
.
Verify aircraft to be flying level in cruise for at least 40 minutes
.
Perform fuel balancing if tank balance exists
.
Establish nominal aircraft configuration for the cruise segment where measurements will be taken, i.e. :
-Autothrottle: ON
-Autopilot: As required e.g. ALT HLD / HDG / NAV
or ALT HLD / NAV
or PROF / NAV
-Air conditioning: NORM
-Anti-icing: OFF
-Trimming: ZCW on A310 / A300-600
.
Whenever possible, the analysis will be conducted on selected data frames, meeting
the following stability criteria:
.Zp < 50 feet/ 30 minutes
.SAT < 5°C / 30 minutes
.GS < 10 kts / 30 minutes
.TAS < 10 kts / 30 minutes
.
Note the accurate values of fuel used engine 1 & 2 (FU1 & FU2) at initial time
.
Record data for at least 30 minutes, if conditions permit, from start of period every 5 minutes until the end, using adjacent fuel-used recording form:
-UTC, latitude or station -Track / course
-CG, -Wind speed / direction
-FU1 / FU2 - Heading and drift
-Total fuel on board (FQI) -TAS / Ground Speed
-altitude (Zp) – (channel 1 and 2) - N11 / N12 (EPR1 / EPR2) (engine 1 & 2)
-Mach – (channel 1 and 2) - FF1 / FF2 (engine 1 & 2)
-SAT / TAT
.
Note the accurate values of fuel used engine 1 & 2 (FU1 & FU2) at initial time
.
Note also latitude or station approaching, drift, heading, wind velocity / direction, track / course for calculation of effects mentioned in section 3.
.
Do not forget to consult weather charts (forecasts and actual) to confirm pressure patterns
.
On A310/A300-600, do not omit to mention TCCS / ARCCS on or off
.
Do not omit to note tail number, date flight sector for referencing
2.3. Data analysis procedure
Based on the flight data over the recorded time span, the following parameters will be
calculated:
.
Time span (.T) = UTCStop – UTCStart
.
Gross weight at start
.
Average altitude (Zp)
.
Average Mach number (M)
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
APPENDICES
.
Average TAT/SAT
.
Fuel used = (fuel used at end – fuel used at start) or (FQI start – FQI end)
.
Aircraft CG (based on takeoff CG and fuel burn schedule (if not mentioned).
The IFP is then used to compute the predicted fuel used for the aircraft flying at the
average recorded flight conditions, over a time span equal to .t and starting at a weight
equal to GW start. The ratio of measured and predicted fuel used will provide the level of
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