Thanks for answers.
9.G, it seems to me that your Jeppesen extract is not equivalent to ICAO? In Doc 81/68 PANS-OPS Volume II, the definition is just the same without "under emergency conditions". (ok I got the Fifth Edition 2006, maybe some things have changed since...)
BTW, your quote of PANS-OPS about racetrack is interesting, but I was precisely disturbed because of this;
- what is your understanding of "entry into a reversal is not practical"?
- what is your understanding of "increase operational flexibility"?
And any idea about using procedure turn rather than base turn or vice versa?