Hi Richard and Bob,

Just doing CPL Performance "On-Line" Section 3 - Solving Balance Problems - Using Minimum Fuel as Ballast.

When checking the answers in the explanations the Moment Index does not appear correct.

Refer to Step 1 Adding the Hard Ballast

Slide 5/9 shows the ZFTotal Moment Index as 705.9 but when you go to the working out sheet

1. about 15 seconds into slide 5, the current Moment Index is only 700.6
2. at 39 seconds into slide 5 you add the 35Kg to the nose locker (moment index of 1.75)
3. then at 1 min and 5 sec, the addition is showing 707.65 (which is correct)

but on the screen 700.6 + 1.75 doe not equal 707.65. This repeats for the "Adding the Fuel" lesson as well.

Just a little thing as feed back

Then on Page 5.40 of the EText, Exercise 5.10 appears to ask for 2 answers to each problem.

1. MTOW permitted and
2. Ballast Fuel Required.

The answers on Page 215 only show the Ballast added and talks about ensuring the ballast fuel is not contained in the required fuel but it does not show the MTOW.

For Ex 5.10 (1) I would assume would be 2721Kg (being made up of given ZFW of 2540 + Total Fuel being 133Kg of required fuel including reserves (not including Start & Taxi as the questions wants TO not Start-up) and the 48Kg of ballast fuel.

Would this be correct???

Regards

OPPS..... I see now. You re not using the Echo ZFW.

Got it.

Thanks for pointing out that glitch in the presentation. it was just a typo on the worksheets. I'll correct that and get a new version uploaded to the course.

Cheers,

Rich

The new version is uploaded. You may need to refresh your browser cache to see the new version though. Thanks again!

Cheers,

Rich

Hi Bob/Richard,

Just a quick question regarding fuel ballast and shifting. If the fwd compartment is full and nothing next to the pilot and the COG is behind COG rear limit can you put weight next to the pilot if it is asking to add weight? Or shift from the rear compartment to seat 2 if it is asking to shift?

Another question unrelated to weights. When working out the weight of fuel burned in flight I assume you work it out as a deduction of flight fuel + taxi/start allowance?

Yes you can put weight on an occupied control seat as long as the aircraft is below 5700kg MTOW (see CAO 20.16.2 para 6.1). If the nose locker was full, that would be the next best thing, having regard for the ZFW limit of course. Shifting weight from the rear to row 2 would help but you would probably have to shift quite a lot of weight to get a reasonable result.

Remember however, that in the CASA exam, the question will always specifically state whether weight is to be added or subtracted or, if shifted, from where to where. They have to do that because there would often be many correct options to get the CofG onto the aft limit but a multi choice question can only have one correct answer. That actually makes it easier for you.

Bob