orporation UNS-1Fw Flight Management System. 2. One Air Data Computer (ADC). 3. One Rockwell Collins TDR-94D ATC/Mode-S/ADS-B transponder. 4. One Radio Tuning Units (RTU-4200). 5. One Attitude Heading and Reference System (AHRS). If the No. 1 ADC fails, activate the No. 2 transponder. If the No. 2 ADC fails, ac

ystone Helicopter Corporation has installed the following Sikorsky Type Certificate options in accordance with the listed Sikorsky drawing numbers. Radio Tuning Units. RTU 4200 33776-61203 FMS: 123 Dual TDR 94D 33776.61369 FMS: N/A DME 42. r 33776-61346 FMS: N/A NAV/LNAV Switch for ADI 335D 33776-61339 F