What was found
EXCESSIVE CABIN ALTITUDE (NO EICAS MSG) AT FL310, CABIN ALTITUDE AT 9600' - 9900', DP 6.2-6.6PSI(<P>R/R ACM IAW AMM 21-54-04-401 & AIR LEAK TEST OK.</P>)
- Difficulty date
- October 22, 2023
- Submitted
- October 23, 2023
- Operation
- Air carrier
- Aircraft
- N471MC
- Make and model
- Boeing 747412
- Aircraft serial
- 26557
- Aircraft time
- 90,310 hours, 14,767 cycles
- System (JASC)
- 2150 · Cabin Cooling System
- Part
- Acm
- Part number
- 880251
- Part serial
- 7744694
- Condition
- Unknown
- Location
- Unknown
- Stage of operation
- CR
- How discovered
- V
- Nature of condition
- I, O
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.