I was looking through the big book o' KBOS instrument procedures when I noticed that almost all of the airport's SIDs and STARs are marked "NOTE: For turbojets only" or some variation thereof:
- Of the ten instrument departures, nine (BLZZR Five, BRUWN Six, CELTK Six, HYLND Six, LBSTA Seven, PATSS Six, REVSS Five, SSOXS Six, and WYLYY Five) are jet-only, with only one (LOGAN Four) allowing non-jet aircraft.
- Of the six instrument arrivals, four (JFUND Two, NORWICH Seven, OOSHN Five, and ROBUC Three) are jet-only, with only two (GARDNER Four and WOONS Two) available for non-jets.
Why are most of KBOS's instrument-departure and instrument-arrival procedures prohibited for non-jet aircraft?