Service difficulty report · Cabin Press Sys · Cessna 525A

Difficulty date
August 24, 2026
Submitted
August 24, 2026
Operation
General aviation
Aircraft
N525KY
Make and model
Cessna 525A
Aircraft serial
0369
Aircraft time
6,813 hours, 5,496 cycles
Part
Cabin Press Sys
Condition
Faulted
Stage of operation
DE
How discovered
O
Nature of condition
J
Precautionary procedure
B, G

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

STARTED ENGINES AT 2W6 AT 1948 LOCAL. TAXIED TO RUNWAY 11, GOT A CLEARANCE, AND TOOK OFF AT 2007, AND REACHED FLIGHT LEVEL 450 AT 2047. WE STARTED THE DESCENT AT ABOUT 2121:30. AT FL360 (2129:30), WE GOT THE DOOR SEAL ANNUNCIATION. ISAIAH STARTED INCREASING HIS DESCENT RATE. IMMEDIATELY FELT MY EARS POPPING BECAUSE OF THE RISING CABIN ALTITUDE. TOLD ATC WE WOULD NOT BE LEVELING AT 34000. THE CONTROLLER GAVE ME 28000. THE DECOMPRESSION WAS SLOW, BUT NOT STOPPING. WE GOT THE RED CABIN ALTITUDE ANNUNCIATION, PUT O2 MASKS ON, AND LET ATC KNOW THAT WE WERE LOSING PRESSURE IN THE CABIN AND COULD NOT LEVEL AT ALL. ATC TURNED US 15 DEGREES RIGHT AND THEN GAVE US 18000. FO REQUESTED THE CHECKLIST WHICH WE COMPLETED. WE WERE ASKED FOR SOULS ON BOARD (8), FUEL REMAINING (1.5 HOURS), AND IF THERE WERE ANY INJURIES (NONE). THE PRESSURIZATION SYSTEM STARTED WORKING AGAIN AT 20000FT (2133:42) AND THE CABIN STARTED PRESSURIZING AGAIN AT 400FT/MIN. WE CONTINUED DOWN TO 12000FT AT ABOUT 80 MILES OUT.

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