RTOW Charts Interpolation
Thread Starter
Joined: Dec 2007
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From: There !
RTOW Charts Interpolation
Hello,
I am looking for reference from EU OPS that you can interpolate for Wind / Weight on RTOW Charts
For example, If your RTOW Charts on A320 for Conf 1+F shows only for the wind -10 0 +10 and if the wind is calm , according to Airbus you have to use 5 Wind but if your chart don't have +5 / -5 would it still be legal to interpolate ?
Thanks in advance !
I am looking for reference from EU OPS that you can interpolate for Wind / Weight on RTOW Charts
For example, If your RTOW Charts on A320 for Conf 1+F shows only for the wind -10 0 +10 and if the wind is calm , according to Airbus you have to use 5 Wind but if your chart don't have +5 / -5 would it still be legal to interpolate ?
Thanks in advance !
Fleet Manager
Joined: Apr 2001
Aviation Qualifications: ATPL
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From: various places .....
As a general observation, the end user doesn't know the physical layout of the chart.
Specifically, where discontinuities exist and the extent of non-linearities.
While one can get around some of these problems by crossplotting that is beyond the line pilot's approach to the question during operations.
Therefore, unless the operations manual provides specific guidance regarding interpolation techniques, it is better to take the published conservative data point and accept whatever penalty is associated.
Re the specific question, and acknowledging nil specific background with Airbus, why ever would one use other than the nil wind line if the wind is calm ? There might be some rationale in L&V conditions.
Specifically, where discontinuities exist and the extent of non-linearities.
While one can get around some of these problems by crossplotting that is beyond the line pilot's approach to the question during operations.
Therefore, unless the operations manual provides specific guidance regarding interpolation techniques, it is better to take the published conservative data point and accept whatever penalty is associated.
Re the specific question, and acknowledging nil specific background with Airbus, why ever would one use other than the nil wind line if the wind is calm ? There might be some rationale in L&V conditions.
Joined: Apr 2013
Posts: 42
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From: Civilization .
Check the FCOM, pages PER-TOF-TOC and you're gonna see that interpolations are pretty commom, specially using speeds and temperatures. I remember in CBT an explain about data interpolation, but I cannot assure you where (probably on performance CBT).
Joined: Jun 2007
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From: Wanderlust
SU-GCM
Can you quote the Airbus document that says you have to use 5kt wind for calm? Because in type rating course documents and performance CD it is not mentioned. Also seems bit odd that if you have to use 5 knot wind then why there is no column for that and why the charts provide zero wind column when it is useless.
Can you quote the Airbus document that says you have to use 5kt wind for calm? Because in type rating course documents and performance CD it is not mentioned. Also seems bit odd that if you have to use 5 knot wind then why there is no column for that and why the charts provide zero wind column when it is useless.
Thread Starter
Joined: Dec 2007
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From: There !
Thank You FoxForce44
TAKEOFF DATA - NET TAKEOFF FLIGHT PATH
PER - TOF - TOD 50 P 1/8
HOW TO PROCEED
2. READ THE ASSOCIATED WEIGHT CORRECTION . INTERPOLATE IF NECESSARY . THE SECOND SEGMENT GRADIENT IS GIVEN FOR INFORMATION ONLY
TAKEOFF DATA - NET TAKEOFF FLIGHT PATH
PER - TOF - TOD 50 P 1/8
HOW TO PROCEED
2. READ THE ASSOCIATED WEIGHT CORRECTION . INTERPOLATE IF NECESSARY . THE SECOND SEGMENT GRADIENT IS GIVEN FOR INFORMATION ONLY
