What was found
BLOCK TURN BACK OILY SMELL IN CABIN AFTER TAXI OUT. RAN BOTH ENGINES AND APU WITH AIR CONDITIONING PACKS FULL HOT AND FULL COLD TO VENT AIR CONDITIONING SYS. R & R RECIRCULATION FILTERS AND OPS CHECKS NORMAL IAW AMM 21-21-41, PB 401.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BLOCK TURN BACK OILY SMELL IN CABIN AFTER TAXI OUT. RAN BOTH ENGINES AND APU WITH AIR CONDITIONING PACKS FULL HOT AND FULL COLD TO VENT AIR CONDITIONING SYS. R & R RECIRCULATION FILTERS AND OPS CHECKS NORMAL IAW AMM 21-21-41, PB 401.