A.
First of all, Table 10.9.B gives the TI and CSI Limits for Aircraft.
For passenger aircraft on a regulars cheduled flight (not under exclusive use or charter) the TI Limit is 50 TI for both non-fissile and fissile material. The CSI Limit for fissile material is 50 CSI. No one is going to charter a passenger aircraft for cargo, therefore there is no entry for passenger flights under exclusive use. For cargo aircraft, if not under exclusive use (regular scheduled flight) the TI Limit is 200 TI for both non-fissile and fissile material. The CSI Limit for fissile material is 50 CSI. When cargo aircraft is chartered (under exclusive use) the TI Limit is lifted to “No Limit” for both non-fissile and fissile material. The CSI Limit for fissile material is 100 CSI.

To processs a shipment containing both non-fissile and fissile material, the step is to (1) determine the sum of TI for both non-fissile and fissile material and confirm the sum is within TI Limits. (2) Then confirm minimum Separation Distance can be maintained between the radioactive material packages and the passenger/crew per Tables 10.9.C or 10.9.D. When the sum of the TI of all packages whether non-fissile or fissile is, for instance, 10.0 TI, a minimum separation distance of 165cm must be maintained between the passenger. The aircraft lower deck cargo hold has a height of 165cm, thus minimum separation distance can not be obtained. Thence it will be necessary to scatter the radioactive material packages applying the “3 times the separation distance applicable to the one that has the larger sum of transport indices” criteria. And, (3) confirm the sum of CSI is within CSI Limits. And (4) Finally, this is an APIO and a Q calculation must be done. Refer ro DGR 10.3.11.4.3 where you will see two Sigma formulae. You can have an APIO of Special Form and Other Form. Q value must not exceed 1.0, and not needed to enter on the Declaration.

Non-Fissile and Fissile Material packed in One Type A package
You did not indicate the TI value of the Fissile Material. Let’s say the TI value of the fissile material was 3.0 TI. The total sum of TI becomes 4.0 TI, and the required separation distance will be 85 cm. The passenger lower deck cargo hold height is 165cm so the package may be 80cm tall and will still have the minimum separation distance from the passenger cabin floor. So the procedure is: (a) check the TI for both non-fissile and fissile material and confirm the sum is within the aircraft TI limits. (b) check the CSI of the fissile material and confirm it is within aircraft CSI limits. (c) check separation distance for the TI sum and ascertain required distance between the package and the passenger compartment floor is cleared. (d) confirm Q calculation. Q value must not exceed 1.0. (Refer 10.3.11.4.3)

How to ship two Type A packages, one Non-Fissile and one Fissile.
There are two options. You can load them apart following separation distance between the two packages or load them next to each other. With either option, you need to check the sum of TI of both packages and ascertain it is within TI Limits. You will also need to check separation distance from the passengers if you are using a passenger aircraft. For the fissile package, you need to check the CSI and confirm the CSI value is within limits. You must check the minimum separation distance between the packages and the passenger compartment floor. If placed together, you must use the sum of TI to determine the separation distance between the passenger. If you isolate the packages, you will be able to maintain easier separation distance between the passenger compartment.