A320 CH 22

1. ALL AFCS COMPUTORS ARE IN 80VU(FWD) EXCEPT SEC3 AND BSCU IN 90VU(AFT)

2. FMGC(FLT MANAGEMENT AND GUIDANCE COMP) FUNC:

                                                FG (FLT GUIDANCE): A/P, FD, AUTO THRUST

                                                FM (FLT MNGMNT): FLT PLAN, IRS ALIGN, RADIO TUNING

3. FMGC HAS DATA BASE FOR NAV AND PERFORMANCE

4. FAC FUNC:

                   Y/D: DUTCH ROLL, TURN COORD, ENG FAIL, YAW GUIDANCE

                   RUDD TRIM

                   RUDD TRAVEL LIM

                   FLT ENVELOPE: SPD CHARACTER, ALPHA FLOOR PROTECTION, WINDSHEAR,          

                   LOW ENERGY AWARENESS, SPD LIM

                   COMPUT CG AND WEIGHT

                  *FAC1 ALSO HAS FIDS (FAULT ISO AND DET SYS)

5. CAT 3 INDICATED IF BTC1,2 AND BAT CONTACTOR,AND DC BUS 2 CONTACT OPEN

6. APU GEN NOT ACCEPTED FOR CAT3

7. ALL FAULT FROM AFS GO TO FIDS THEN CFDS

8. A/P MODES CAN ENGAGE FROM FCU OR FMGC

9. MCDU USED FOR LONG TERM CONTROL AND FCU USED FOR SHORT TERM

10. ANY INCREASE LOAD THRESHOLD ON SIDE STICK OR PEDALS COZ A/P DISENG

11. A/P ENGAGE ON GND IF : ENG’S SHUT DOWN AND ALIGN

     *NO HYD REQUIRED

12. T/O MODE CAN BE SEL FOR FD

13. A/P ENGAGE ON FLT IF A/C AIRBORN MORE THAN 5SEC

14. BSCU RECEIVE STEERING ORDER FOR ROLL OUT FROM:

                                                                                                    HAND WHEEL

                                                                                                    FMGC VIA ELAC

15. BSCU SEND WHEEL SPD TO FMGC’S

16. NORMALLY FMGC1(2) CONNECTED TO PFD1(2) VIA DMC1(2)

17. DMC’S AUTO SEL OTHER FMGC IF ONE FAIL

18. FD BAR CLEARED IF:

                                         PUSH FD P/B (NOT DIS-ENG)

                                         NCD 

                                         BOTH FD LOSS

19. FD FLAG IF FD’S DISENG WITH P/B OR BOTH FMGC FAIL (ATT MUST AVAIL)

20. A/P LAT MODES:

                                  HDG HOLD

                                  NAV

                                  TRACK HOLD: IF PULL HDG/TRACK KNOB

21. A/P LONG MODES:

      V/S, FPA HOLD, ALT, ALT ACQ, DESENT, OPEN DESCENT, CLIMB, OPEN CLIMB

22. RUD TRIM:

                      MANUAL: WITH RUD TRIM SELECTOR HAS FEED BACK TO PEDALS

                      AUTO: IF A/P ENGAGED

23. WINDSHEAR INDICATED AT CENTER OF BOTH PFD

24. RUDD POSITION SHOWN ON ECAM SYS PAGE AND RUD CONT PNL

25. MAX RUD TRAVEL SHOWN IN ECAM WITH WHITE BAR

26. LAND CAPIBILITY SHOWN ON ECAM STATUS PAGE

27. FMGC CONT ELEV,THS,AIL VIA ELAC AND CONT SPOILERS VIA SEC AND ELAC   

      AND NOSE WHEEL ( IN ROLLOUT ) VIA ELAC AND BSCU AND RUDD VIA FAC

28. IN LAND MODE A/P1 IS ACTIVE A/P2 STBY

29. 1FD2 ON PFD SHOWS THAT EACH FD FEED OWN SIDE

30. –FD2 MEANS FD#1 IS NOT SHOWN ON PFD1

31. FD SYMBOLS: FD BARS AND FLT PATH DIRECTOR AND FLT PATH VECTOR

32. FD ENGAGED AT POWER UP IN HDG AND V/S MODE

33. ROLL BAR REPLACED WITH YAW BAR IN ROLL OUT AND T/O BELOW 30FT AND LOC AVAIL

34. FCU SEND AUTO THR SIG TO ECU VIA EIU

35. AUTO THR P/B INHIBITED BELOW 100FT WHEN ENG RUN

36. AUTO THR ENGAGED AUTOMATICALLY WHEN GO AROUND OR T/O MODE 
      ALSO IF ALPHA FLOOR DETECTED WHICH INHIBITED BELOW 100FT(AFTER 15S 

      FOLLOWING LIFT OFF)

37. A/T MAN ENG IF LEVER IS BETWEEM 0 AND CL OR CL TO FLX IF NO FLX SEL  
      AND ALFA FLOOR DET INDEPENDENT OF LEVER POS

38. A/T ENGAGE BUT DEACTIVED IF LEVER ABOVE CL OR FLX WITH NO ALFA FLOOR DET

39. A/T ENGAGEMENT CONFIRMED IN ECU

40. THR LEVER HAS 5 DETENT:

1- GND IDL

2- 0: FLT IDLE

3- CL: FOR CLIMB

4- FLX/MCT: FLEXIBLE T/O OR MAX CONTINIOUS THR AT ENG FAIL

5- T/O G/A

41. FMGC SELECTS HIGHER THR LIM OF BOTH ENG FOR COMPUTATION

42. A/T MODES: SPEED OR MACH AND THR SEL BY FCU OR FMGC

43. RETARD AVAIL IN AUTO LAND BELOW 40FT

44. WHEN A/P CONT SPEED WITH ELEV A/T CONT THR (THR MODE)

45. WHEN A/P NOT IN SPEED A/T CONT SPEED

46. NO VERTICAL MODE ACTIVE SO A/T CONT SPEED EXCEPT ALFA FLOOR (GOES TO THR)

47. ALFA FLOOR DET BY FAC DONE BY FMGC ( ON FMA A.FLOOR FLASHING AMBER  
       BOX AND AFTER ALFA FLOOR DISAPEARED TOGA LK (TOGA LOCK))

48. ALFA FLOOR CAN BE CANCEL BY DISENG THE A/T

49. FLX TEMP CAN SEL IN MCDU

50. LEVER SET TO T/O OR FLX (IF TEMP SELECTED) CAZ A/T ENG BUT NOT ACTIVE

51. LEVER SET TO 0 COZ A/T DESING AND SPOILERS ACTIVE IF ARM

52. MCDU FAIL GOES TO FIDS VIA FMGS'S CMD PART

53. ALL SAFTY TEST DONE ONLY IN GND WITH ENG STOP AND HYD AVAIL FOR FAC ONLY

54. FCU SAFTEY TEST CAN DONE IN GND OR FLT

55. Y/D ORDER CALC IN ELAC SENT TO FAC IF NO A/P

56. IF BOTH ELAC FAIL DUTCH ROLL DONE IN FAC ALT LAW (USE ADIRU DATA)

57. IF A/P ENGAGE Y/D DONE BY FAC USING ADIRU (EXCEPT TURN COORD USE FMGC)

58. IN LAND MODE YAW ORDER DONE IN FMGC VIA FAC

59. RUDD TRIM DONE BY FAC IF A/P ENGAGE

60. TURN COORD DONE IN FAC BY Y/D AND RUDD TRIM ACTUATOR (USING FMGC ROLL ORDER)

61. ENG FAIL COMPENSATION ALSO SENT FROM FAC TO TRIM AND Y/D ACTUATOR(USES ADIRU)

62. RUD TRIM LIM DONE BY FAC USING VC FROM ADIRU

63. ENG FAIL COMPENS AVAIL IN TO/GA MODE IF A/P ENGAGE

64. RUDD TRIM CAN DO BY TRIM SEL VIA FAC IF NO A/P

65. FAC CAN'T ENGAGE DURING POWER UP TEST ON GND (30S FAULT LIT FLASH)

66. FAC FUNC'S FAIL IT REMAIN ENGAGED CAN RESET

67. FAC RESET IN FLT ONLY BY FAC P/B BUT GND CAN ALSO RESET FROM ECAM

68. Y/D1 IS G AND Y/D2 IS Y

69. Y/D POWER LOOP MONITORED BY A COMPRATOR BETWEEN YAW ORDER AND RUD POS

70. DMC AUTO SW TO OTHER FAC IF ANY PARAMETER FAIL

71. IF FAC SPEED AND DMC SPD IS DIFF ADR DISAGREE ON ECAM

72. COMPUTE WEIGHT THEN CG USE ADIRU, FMGC AND SFCC ON GND ONLY FROM FMGC

72. WINDSHEAR NOT AVAIL IN CLEAN CONFIG

73. DUAL ADIRU FAIL ALFA FLOOR LOSS

74. ALFA FLOOR DET IN FAC AND ELAC DONE BY A/T (A/T WILL ENGAGE AUTO)

75. TARGET SPD SHOWN ON PFD MAGENTA FROM FMGC

76. V MAX REPRESENT LOWEST VALUE OF VMO, MMO,VFE(FLAP EXT) AND VLE(L/G EXT)

77. VF AVAIL IF FLAP LEVER IS IN POS 2 OR 3 AND VS AVAIL IF FLAP IN POS 1

78. VFE AVAIL BELOW 15000 FT SHOWN BY AMBER DASH

79. VM SHOWN BY GREEN DOT REPRESENT BEST LIFT TO DRAG RATIO

80. V TREND SHOWN BY YELLOW ARROW (SPD AFTER 10S)

81. V1 (DECISION SPEED) DISAPEARED AFTER LIFT UP

82. FAC WARN INHIB IS DUE TO FLT PHASE OF FWC (NOT FMC)

83. ONE Y/D OR RUD TRIM OR TRAVEL LIM FAIL RESET AUTO

84. ONE P/B FOR ENGAGE OF BOTH A/THR , PRIORITY DEPENDS ON WHICH FMGC IS ACTIVE

85. A DOT LIT ON FCU WILL ON IF A LAT MODE ARM OR ACTIVE (NAV, LAND,)

86. HDG P/B ONE TURN COZ SHOW PRESENT HDG/TRACK 45S THEN DASH IF MORE  
      TURN CAN CHANGE VALUE, PULL TO ACTIVE HDG OR TRACK

87. HDG KNOB PUSH ACTIVE THE NAV MODES

88. ONLY ALT WINDOW NEVER SHOW DASH

89. V/S KNOB FUNC IS SIMILAR TO HDG

90. APPR MODE BELOW 400FT CAN DISENG ONLY BY G/A

91. DURING T/O AND G/A SPEED WINDOW IS DASH AND FMGC USE V2

92. DURING MANAGED FLT SPEED/MACH SW IS AUTO

93. IN FMS INDEPENDENT MODE CROSS TALK AVAIL

94. EACH FMS TUNE OWN SIDE RADIO VIA RMP BUT OPPOSITE FMS DIRECTLY TUNE THE RADIO

95. A/C SYMBOL ON ND IS ALWAYS FIXED EXCEPT PLAN

96. ALT ALERT CANCELLED IF : ALT KNOB TURN, OR L/G DOWNLOCK, OR LEVER 

      DOWN WITH SLAT EXT

97. FAC AND FMGC FRONT FACE IS OBRM(ON BOARD REPLACEBLE MEMORY)

98. EACH FMGC HAS 2 PHYSICALLY SEPERATED : COMMAND AND MON CHANNEL  

      WHICH COMMAND HAS FM AND FG PART BUT MONITOR CHANNEL ENSURE 

      ONLY FG PART

99. FCU HAS 2 COMPUTER WHICH POWERED SEPERATELY

100. SECOND PUSH OF TAKE OVER P/B COZ CANCELL WARNINGS OF A/P

A310-200/300 AFCS ATH

ATH
1. ATH LOGIC:

• FAC, ADC, FADEC OK
• IRS OK FOR SPD/MACH
• ONE TRP MODE SEL

2. ATH MODES :

• SPD/MACH: AUTO SEL IF V/S,ALT, LAND, PROFILE ACTIVE
• THRUST: MAX THR IS FOR T/O , G/A, P-CLIMB, P-THR
• RETARD

3. ON TRP AUTO P/B PUSH ATH CONT BY FMS AND SHOWN IN TARGET
4. ATH LATCH : AT G/A AND ALFA FLOOR , MANUALLY MUST RETARD
5. ATH DECLUTCH IN T/O IF T/O PWR REACH AND SPD>100KT
6. BOTH ATH DECLUTH AT THE SAME TIME EXCEPT IN T/O
7. MANUAL SEL IN PROFILE NOT POSSIBLE(AUTO SEL)

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

A310-200/300 AFCS A/P

A/P

1. A/P#1 USE G HYD,     #2 USE Y
2. A/P ENG LOGIC:

HYD PRESS OK

Y/D OK

PITCH AND ROLL SERVO OK

YAW SERVO OK WHEN SLAT EXT IN CMD

BANK<45

3. A/P COMPUTERS  POWERED IF:

ENG RUN

LIT TEST

AFCS TEST OR GND SCAN ON MTP

A/C IN FLT

P/T ENG

4. F/D LOGIC:

FCC AND FAC AND FCU OK

2 IRS OK

L/G SW AND ADC OK

5. A/P#1 HAS MECH PRIORITY IN LAND
6. BASIC MODE: FIRST WING LEVEL ,HDG HLD, V/S
7. ROLL BELOW 5DEG MEANS WING LEVEL
8. ON GND INITIAL MODE IS CWS BUT IF ENG SHUT  CMD IS INITIATED AND IN FLT IS CMD
9. YAW SERVO OPERATIVE IN CMD + SLAT EXT FOR HDG HLD
10. A/S HELD BY ELEV IN CLIMB AND DESCEND(LVL CHANGE MODE) , ATH GOES TO THRUST MODE
11. COMMON MODE BETWEEN LAT AND LONG:

T/O, G/A: THR FULL, SRS, LOC OR HDG HOLD OR HDG SEL

LAND, APPR: LOC+G/S (SPD HELD BY ATH)

12. FCU OUTPUTS ARE DIGITAL
13. FCU IS FAIL PASSIVE HAS DUAL POWER
14. PRESET GREEN LIT ON AFTER REACH THAT ALT
15. HDG SEL BUTTON:  PUSH TO SEE PRESENT  HDG AND PULL TO HDG SEL ENGAGE
16. SPD P/B : PUSH TO PRESET AND PULL TO SPD OR MACH MODE
17. ALT SEL P/B: PUSH TO CHANGE 100FT TO 1000FT AND PULL TO SEL LEVEL CHANGE
18. V/S P/B : TURN TO SELECT DESIRE V/S  AND TURN 1 CLICK TO SEE PRESENT  V/S IN 12SEC
19. HDG SEL KNOB HAS 2 POS: NORMAL(25DEG),15DEG
20. IF ANOTHER LONG MODE SEL V/S DISPLAY DASH
21. PROFILE SEL SO A/P AND ATH (IF AUTO ) WILL COUPLE  TO FMS
22. SPD SEL IN PROFILE COZ A/P GO TO LVL CHANGE
23. IN LEVEL CHANGE  INCREASING ALT MAX THR SEL AND DECREASING ALT THR WILL GO TO IDLE BUT SPD HELD
24. SPD AUTO CHANGE TO MACH IN 25400FT
25. YAW BAR SHOWN ONLY IN ALIGN AND T/O DISABLED BELOW 30FT
26. FD DISENG COUSES A/P DISENG
27. BOTH CWS CAN’T BE SELECT AT THE SAME TIME
28. ALL DATA ARE ARINC EXCEPT DISENG SW’S (DESCRET)
29. A/P DISENG WARN :

ALT>200FT: A/P OFF LIT FLASHES + INTERMITTENT CAVALRY CHARGE

ALT<200FT: AUTO LAND FLASHES+ INTERMITTENT CAVALRY CHARGE

30. ROLL OUT LOSS INDICATED  ON PFD
31. TRIPLE CLICK HEARD IF LAND MODE CAPIBILITY REDUCTION
32. AUTO LAND LIT FLASHES IF:

ONE A/P OFF

LOC OR G/S HI DEV

ALFA LONG FLARE

R/A ‘S DIFF >10FT

B747-100/200 AFCS -AUTO THR

A/T

1. ATH TAKE ALT FROM R/A#2 FOR FINAL FLARE RETARD IN 30FT
2. ATH HAS 4 FWD LIMIT SW AND 4 AFT
3. ATH RECEIVES SPD ERR FROM CAPT A/S IND
4. FWD THR LEVER MOVE STOP NEED ONE MSW BUT AFT NEED 2
5. ATH COMPUTOR HAS ACC INSIDE TO MAINTAIN AND PREDICT SPD
6. FULL REGIM A/T TAKE SIG FROM AOA AND INS#1
7. ACC #3 IS FOR ATH NOT I/W OTHERS

B747-100/200 AFCS -Y/D

Y/D

1.   Y/D IS FAIL OP

2.   UPPER Y/D: CAPT SIDE , HYD 3 ,INBOARD FLAP POS, INS #1(FOR TURN COORD), ACC#1

      LOWER:  F/O, HYD 2, OUT FLAP POS, INS#2

3.  IN 747-SP FLAP POS REPLACED WITH A/S AND AIL LVDT (FOR TURN COORD INHIB)

4. LCLU GIVE A LOGIC TO Y/D FOR FINAL APP PRECISION INCREASING

B747-100/200 AFCS -PITCH TRIM

PITCH TRIM

1. FEEL COMP OUTPUT GOES TO ASTU (AUTO STAB TRIM UNIT) FOR TRIM TRESHOLD

2. 2 ELEC SIG (ARM ,CONT) FROM ROCKING LEVER GOES TO STAB INTERFACE UNIT

3. THERE ARE 2 MSW FOR GREEN BAND

4. ASTU HAS 2 PART THAT IS FAIL OP

5. ASTU #A SEND TO R/H CONT MODULE

6. FEEL COMPUTOR LIMIT TRIM DEPEND ON STAB POS AND A/S AND OPPOSE FORCE TO CONT WHEEL

7. BRAKE RELEASE LIT ON WHEN PRESS OK (STAB IS TRIMING)

B747-100/200 AFCS -A/P

22

A/P

1.      A/P CAN’T T/O JUST F/D PROVIDE PITCH AND ROLL

2.      A/P OFF, F/D ON ALT HOLD SELECTED WHICH PITCH BAR CONT BY CADC ALT ERROR AND ROLL BAR BY MODE SEL PNL

3.      A/P ENG SW LOCKED IN OFF POS IF LOGICS NOT SATISFY (PITCH MORE THAN 25DEG TK (TURN KNOB) NOT IN CENTER)

4.      A/P AND F/D MAN  BASIC MODE: WING LVL THEN PITCH ATT HOLD IF BELOW 25DEG THEN HDG HOLD

5.      PCW AND ENABLED IN MAN OR CMD WITH NO UPPER SELECTED

6.      ALT HOLD HAS PRIORITY OVER PCW

7.      TK OUT OF DETENT HDG HOLD DISABLED

8.      TK MUST BE MORE THAN 7DEG TO GEN TK COMMAND

9.      IN ALT HOLD PTW INOP AND PCW DECLUTCH

10.  VOR ILS SIG GOES TO LCLU (LAND CONT LOGIC UNIT)

11.  COURSE SEL SW HAS 3 POS :

                                                 NO1 : ALL SYS USE NO1

                                                 DUAL: OR TRIPLE: SPLIT SYS (ONLY IN LAND CAN BE SEL)

                                                  NO2:

12.  A/P CMD BASIC IS PITCH ATT HOLD, HDG SEL

13.  A/P GOES TO CMD ALT SEL TRIP , ALT HOLD REMAIN ON

14.  ALT SEL IS AMBER IN ARM AND GREEN IN CAPTURE (1200FT TO SELECTED)

15.  PCW CAN SEL AS SUB MODE OF ALT SEL

16.  ALT SEL HOLD IS MORE ACCURATE THAN ALT HOLD WHEN ALT ERR BELOW 6.5FT

17.  OSS (OVER STATION SENSOR IN VOR INHIBITES THE DAVATION (IF MORE THAN 8 MV/S) AND HDG HLD ACTIVE

18.  IN TURB MODE: WING LVL ,PAH, CMD TRIP TO MAN , ALT HLD INOP, GAIN IS 50%

                                 BUT VOR, PCW, TK IS OK

19.  CHANGE MAN TO CMD : TURB TRIP

20.  IN INS MODES CMD SIG:

                     ARM: HDG SEL

                     CAPTURE: TKE AND XTK

21.  V/S WHEEL SHOWS EXISTINIG V/S BUT IF V/S SELECTED IT CAN BE CHANGED

22.  IN LOC APPROACH MODE ROLL CONT SWITCHED TO LCLU (OR LCRU)

23.  BOTH A/P CAN’T BE ENGAGED IN MAN

24.  B/B (BACK BEAM (NO G/S)) IS FD MODE SO A/P MUST OFF OR MAN

25.  B/B SW ON THEN CMD TRIP TO MAN, NAV ARM,SIGNALS 180DEG CHANGED

26.  G/S ARM IF ILS OR NAV SELECTED

27.  G/S CAPTURE : G/A ARM , PITCH DONE BY LCLU

28.  G/A ACTIVE IN ILS OR LAND TRACK WILL BE HOLDEN

29.  LAND MODE : POWER ISOLATED TO ENSURE FAIL OPERATION

30.  TRIPLE WHITE : ALL A/P  ENG BUT FIRST ONE GIVE CMD

31.  TRIPLE GREEN MEANS ALL A/P HYDROLICALLY ENG (ALL GIVING CMD)

32.  LAND SELECTED WITH ONE A/P ,IT DISC IN 150FT

33.  A/P IS FAIL PASSIVE IN DUAL AND FAIL OPERATION IN TRIPLE

34.  THERE ARE 3 ACC FOR LCLU

35.  CADC#1 GIVE ALT ERR TO A/P A+C AND CADC#2 TO B

36.  CADC#1 FAIL A/P DON’T DISENG

37.  V/S FOR A/P #C FROM ALT RATE UNIT

38.  CCA AND PCU GOT MECH SIG FROM CONT COLMN AND ELEC SIG FROM A/P

39.  COMPUTOR BITE SW OUT OF OFF POS OR FAIL OF SENSOR IN USE COZ STEADY RED WARN A/P

40.  MAN ELEC TRIM COZ A/P TRIP BEFOR G/S ARM

41.  ILS OR LAND SEL FRQ NOT SET SO A/P TRIP

42.  VOR/ILS RX AND PITCH COMP ARE HARD WIRED TO LCLU

43.  R/A TEST INHIB WHEN A/P USING IT

44.  Y/D TEST INHIB IN FLT

45.  TURB IS INHIB IN ILS AND LAND

46.  MAN TRIPS ALT HLD

47.  F/D FAIL A/P DISENG

48.  A/P #A GOES TO R/H CCA AND L/H PCU

49.  LAT ACC IS NEAR THE CG

50.  2 VERT ACC ABOVE IRS BAT

51.  MECH VOTER CHOOSE LEAST VALUE OF 2 INPUT AND MID VALUE OF 3

52.  ROLL AND PITCH COMPUTORS HAVE RATE GYRO INSIDE

53.  ZERO V/S CAN BE USED AS ALT HLD