What was found
AT APPROXIMATELY 7000 FT, LOST THE LT AIR DATA COMPUTER. SPEED TAPE, ALTITUDE, ALL INDICATIONS ON CAPTAIN`S SIDE, ROLLING ERRATICLY UP AND DOWN. DURING TROUBLESHOOTING FOUND THE LT AIR DATA COMPUTER FAULT BALL LATCHED. RETURNED CAPTAIN'S SOURCE SELECT SWITCH BACK TO NORMAL AND LOST ALL AIR DATA SYSTEM INDICATIONS. REMOVED AND REPLACED THE LEFT AIR DATA COMPUTER IAW MM34-12-01-4. NO CURRENT FAULTS NOTED DURING MCDP TEST 30, IAW MM 22-00-02/201 AND LEFT ADC OPERATIONAL TEST PASSED, IAW MM 34-12-00-5. ACFT OK FOR SERVICE.