What was found
AIR TURNBACK, DURING CLIMB OUT AT APPROXIMATELY 21,000 CABIN WARNING HORN CAME ON-CABIN APPROXIMATELY 10-11000FT. DESCENDED AND RETURNED TO PHX. R&R NR 1 ENGINE HIGH STAGE REGULATOR PER MM.
- Difficulty date
- August 21, 2018
- Submitted
- August 23, 2018
- Operation
- Air carrier
- Aircraft
- N747SA
- Make and model
- Boeing 7377H4
- Aircraft serial
- 29799
- Aircraft time
- 67,468 hours, 39,785 cycles
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Regulator
- Part number
- 1074847
- Part serial
- 2760C
- Condition
- Faulty
- Location
- Bleed Air Sys
- Stage of operation
- CL
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.