Service difficulty report · Control Valve · Beech B300

Difficulty date
July 21, 2019
Submitted
July 24, 2019
Operation
Air carrier
Aircraft
N49WC
Make and model
Beech B300
Aircraft serial
FL144
Aircraft time
11,212 hours, 8,662 cycles
Engine
Pwa PT6A60A
Engine time
10,614 hours, 8,211 cycles
Part
Control Valve
Part number
10138002521
Part serial
8AB218
Condition
Inoperative
Location
Cabin Pressure
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
B

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

What was found

WHILE CLIMBING TO OUR CRUZE ALTITUDE OF 26000 THE WHITE CABIN ALTITUDE LIGHT ILLUMINATED AND THE HORN SOUNDED WHILE CLIMBING THROUGH 23500. THE CABIN ALTITUDE WAS 10200. WE LEVELED OFF AT 24000 FOR 3-4 MINUTES BUT THE CABIN ALTITUDE KEPT CLIMBING. WE STARTED A DESCENT AND WHILE DESCENDING THROUGH 23500 THE RED CABIN ALT HIGH LIGHT ILLUMINATED AND THE HORN SOUNDED. WE DECLARED AN EMERGENCY AND DIVERTED TO KTWF. WHILE DESCENDING THROUGH 11000 THE CABIN ALT WAS 10000 AND DIFF PRESS WAS 1.5,

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