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Answering these Maximum Baggage loading questions requires use of the graph on Page 46 of the S76 Handbook. When using any graph there is always an inherent accuracy problem. The Centre Of Gravity Limits graph is a scanned, enlarged and eventually digitally printed recreation of an original S76 Flight Manual graph. During the process of producing this graph by CASA some quality was lost. The 2025 ATPL(H) Info Book no longer advises the accuracy required The actual accuracy applied by CASA has never been stated, however after many years of training experience it seems achieving a tolerance of plus/minus 15-20 kg is a good target for students amd is achievable if the methods described in these examples are followed. The answers given for this random question generator are based on fixed Weight and CG data points along the line at the rear of the envelope, with information between these points determined by mathematical interpolation. The answers produced have not been rounded off beyond the nearest whole number. Provided you can achieve a result within the tolerances mentioned for each type of question you are going real good! The tolerance is low where you would have actually exceeded the rear CG limitation, so please look again if you exceed tolerance where the upper or lower limit of +/- 10 kg had been applied. There is never a perfect answer from a graph. Just an accepted average. Please keep that in mind, as you will most likely never perfectly match answers. The final answers provided in the worked solutions and the target CG position for adding/subtracting and shifting questions has been set for these RQG's at 2 mm inside the envelope limit line. That is a good target to aim for, so if you don't match answers exactly maybe you are actually closer to the edge without exceeding the limit and still correct. Graphs are such a hard thing to work with. THE PLOTTING METHOD vs FORMULA METHOD The CASA APLH exam now consists of many SSA 'type a number in the box' questions, which means accurate plotting of the data is required. For both adding/removing baggage or cargo and passenger questions or shifting weight in/out of the baggage compartment, cargo areas or passenger seats the plotting method achieves accurate results. The plotting method used is based upon change of the CG position in MM on the CG Millimeter AFT of Datum scale, rather than plotting the change in weight in KG on the Gross Weight scale. The reason for interpolating CG in MM rather than Weight in KG, is the much greater accuracy that can be achieved using the CG MM scale. The plotting method is fully described in all load adding/removal examples. For load shifting examples you can also use the plotting method, however some students like to use a formula, so the formula method is described for all load shifting examples. Using the formula still requires some plotting to find the FWD or AFT limits at the gross weights being used. Whichever method you end up preferring, please remember staying within tolerance is your only mission. Please Click Here to return to the login page. |