What was found
PIT-MSY - FLT 1635 - DURING CLIMB TO 31,000 FT, THE AIRCRAFT WOULD NOT PRESSURIZE USING EITHER PRIMARY, STANDBY, OR MANUAL SYSTEMS. THE CABIN OXYGEN MASKS DEPLOYED. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. (M)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PIT-MSY - FLT 1635 - DURING CLIMB TO 31,000 FT, THE AIRCRAFT WOULD NOT PRESSURIZE USING EITHER PRIMARY, STANDBY, OR MANUAL SYSTEMS. THE CABIN OXYGEN MASKS DEPLOYED. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. (M)