What was found
AIRCRAFT WAS GROUNDED: IN FLIGHT WITH SPEED BRAKES DEPLOYED, LANDING GEAR HORN SOUNDED IN CONJUNCTION WITH THREE RED LANDING GEAR LIGHTS. GEAR HANDLE WAS IN THE OFF POSITION, FLAP HANDLE WAS IN THE "FLAP UP" POSITION. REMOVED AND REPLACED ALL FOUR RADIO ALTIMETER ANTENNAS (AALA202511246778), (AALA202511246336), (AALA202511244860), (AALA202511246100). PER AMM 34-33-11. INSTALLATION TEST CHECKS GOOD.