- Difficulty date
- July 9, 2021
- Submitted
- July 13, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737752
- Aircraft serial
- 34297
- Aircraft time
- 47,339 hours, 26,761 cycles
- Part
- Line
- Condition
- Damaged
- Location
- 9th Stge Duct
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACKS UNABLE TO MAINTAIN CABIN PRESSURISATION WITH IDLE THRUST @ FL280 ALTITUDE WARNING ; / [01] TROUBLESHOT & FOUND DAMAGED SENSE LINE FROM 9TH STAGE DUCT; CONNECTING TO HIGHSTAGE REGULATOR. REF SOPM 20-50-00. PERFORMED PACK CONFIDENCE CHECK MT 721-00-01 & EXCESSIVE CABIN PRESSURE LEAKAGE CHECK REF AMM 05-51-91. ALL CHECKS GOOD.