Help on question

[Buffalowings]

Parameter P is:

A Fore and aft magnetism affecting coefficient C
B Fore and aft magnetism affecting coefficient B
C Fore and aft magnetism affecting coefficient A

And what is the proper definition of Parameter P???

Thanks

[Solid Rust Twotter]

http://www.pprune.org/tech-log-15/

http://www.pprune.org/questions-67/

http://www.pprune.org/professional-pilot-training-includes-ground-studies-14/

[Der absolute Hammer]

Is not Parameter P the hard and soft iron component of magnetism acting in the fore and aft fuselage axis and composed of Coefficient B.
Parameter Q is the same in the athwartships axis and is composed of Coefficient C.
Parameter R is the one in the vertical axis and give rise to Coefficient D.
???????
The Coefficient A is the residual magnetism?
It has been a long time but I think Kermode has a word or two to say on the subject. So the answer to your question would be B?
Hard iron ball back in to the court?