What was found
AFTER TAKEOFF, CAPTAINS FLIGHT INSTRUMENTS HAD ATT FLAG IN ADI, HSI. FLAG IN HSI FOLLOWING RED WARNING LIGHT ON INU NR1, CODE 591 IN INS, PLATFORM FAILURE. INS WAS SHUTDOWN, UNABLE TO RESTORE CAPTAINS HSI AND ADI. USING FHB PROCEDURE CIWS LIGHTS ON CAPTAINS SIDE WERE ATT( NR1 INU REPLACED, UPDATED SAME, REALIGNED ALL 3 INU'S ALL FUNCTIONS CHECKED NORMAL)