on occassion of a recent incident (not yet on AVHerald) with a 777 hitting a lighting pole on BB2 between K1 and Z (being sent there by ATC as confirmed on liveatc.net recordings), I was reviewing taxi charts on KORD. Interestingly, there is conflicting information:
- 20-9 has operational note 13 stating BB2 closed for wingspan >36m.
- 20-9D2 has only turn restrictions from K and Z1 into BB2 between K1 and Z for >B737. No indication that BB2 is blocked anywhere between K1 and BB.
- 20-9K confirms 20-9D2 turn restrictions but shows BB2 approved for B747-8 between AA and BB, directly contradicting 20-9!
- 20-9L same as 20-9K but for A380.
(20-9M provides a nice zoom-in for the taxiway designators)
So, given that ATC has ordered the 777 (coming from CC, left onto K) to taxi via BB, then into BB2 (to join Z northbound), that was legal according to 20-9D2, and up to AA according to 20-9K&L, but blank illegal according to 20-9.
Anyway, my point is that the B748 & A380 taxi charts explicitly permit BB2 between AA and BB, but the 20-9 chart does not. Sounds like 20-9 is “over-restricting” at least between AA and BB.
Could you forward this to Jeppesen for review?