A310-200/300 AFCS Y/D

Y/D

1. ENGAGE LOGIC:

• ADC OK OR FLAP > 15
• HYD (Y FOR #2 AND B FOR #1) OK OR MAIN L/G COMPRESS
• AT LEAST 2 IRS OK

2. FAIL SOFT: FAILURE HAS LIMITED EFFECT DOESN’T NEED DISCONNECT
EX: UPPER MODE FAIL A/P GOES TO BASIC

• FAIL PASSIVE: FAILED UNIT WILL DISCONNECT IMMEDIATELY

EX: EACH AFCS IS FAIL PASSIVE

• FAIL OPERATIONAL: IF ONE SYSTEM FAIL ANOTHER SYS DO ITS JOB

3. FAC FUNCTIONS:

• DUTCH ROLL: WHOLE FLT AVAIL, SIG FROM IRS
• TURN COORD: FROM EFCU (SPOILERS), IF A/P NOT IN CMD (IF A/P IN CMD HAS COORD)
• ENG FAIL COMPENSATION: FROM LAT ACC IN IRS, A/P MUST BE CMD IN G/A OR SRS + SLAT EXT
• PITCH TRIM
• ALFA FLOOR PROTECTION COMPUTATION

4. TURN COORD INHIBITED IF:

• BOTH EFCU FAIL
• STALL WARN
• A/P IN CMD
• FLAP>40°

5. FAC INPUTS:

• VC (COMPUTED A/S): RATE CHANGE IN HI SPD
• FLAP: RATE CHANG
• EFCU
• IRS
• A/P

6. SYS #1 HAS MACHANICAL PRIORITY

7. Y/D FAIL:

• ONE: FLT CONT IN WLDP, Y/D OFF AMBER ON WD
• BOTH: ALSO SSC

8. Y/D HAS NO FEED BACK TO PEDALS BUT A/P HAVE