LOKON,
Not a trick question !!, it was a question asked by the engineers.
We do follow the IPC as required, but then again you normally have commercial stock of ty-wraps as well, the question was only, can you fit Ty-wraps with the metal barbs or not ?
Keepitup
NB. I have been told an MD11 had an avionics fire and the cause was put down to the failing of a ty-wrap with the metal barb and the barb caused arcing which resulted in a fire.