Service difficulty report · Sensor · Pilats PC1247E

Difficulty date
May 7, 2024
Submitted
May 14, 2024
Operation
Air carrier
Aircraft
N399LA
Make and model
Pilats PC1247E
Aircraft serial
1884
Aircraft time
3,036 hours, 7,941 cycles
Engine
Pwc PT6A67P
Engine time
3,036 hours, 7,941 cycles
Propeller
Hartzl HCE5N3
Part
Sensor
Part number
9754421423
Condition
Stuck
Location
Aoa
Part time
1,635 hours, 4,343 cycles
Stage of operation
CL
How discovered
O
Nature of condition
N
Precautionary procedure
A

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

What was found

A ROUTINE FLIGHT FROM HNL TO LNY, FLIGHT NUMBER 216 DEPARTED, EXPERIENCED A NON REQUIRED SHAKER ACTIVATION APPROX 5 SECS AFTER TAKEOFF. LEVELED ACFT & HELD PUSHER INTERRUPT BUTTON TO PREVENT PUSHER ACTIVATION, & TO TROUBLESHOOT BRIEFLY & ULTIMATELY DECIDED TO ABORT TAKEOFF. PIC PITCHED AIRCRAFT DOWN TO LAND BACK AT RUNWAY & ADVISED TOWER. UPON PITCHING DOWN & FOR EXTRA SAFETY THE PIC UTILIZED THE BETA RANGE OF POWER TO ENSURE PROPER LANDING DISTANCE. ONCE THE ACFT TOUCHED DOWN, CREW SHUT ACFT DOWN & FOLLOWED SHUT DOWN PROCEDURES. APPROX 500FT LEFT OF AVAILABLE RUNWAY. CREW ADVISED TOWER THAT THEY HAD SHUTDOWN ON THE RUNWAY & DID NOT REQUIRE MEDICAL OR EMERGENCY ASSIST. CONTACTED MAINTENANCE OPS & ADVISED NEEDED AN AIRCRAFT TOW. MAINT DOWNLOADED CVFDR & SENT FILES TO ENGINEERING FOR ANALYSIS. FDR DATA SHOWED THAT AS SOON AS THE WOW SWITCHES WENT INTO AIR, STICK PUSHER COMPUTER ACTIVATED SHAKER DUE TO ONE OF THE AOA SENSORS WAS STUCK AT A HIGH ANGLE. FDR DATA DIDN'T SHOW WHICH AOA SENSOR WAS STUCK SO MAINT HAS REPLACED BOTH SENSORS.