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FCOM System Description > 4. Automatic Flight > Flashcards

4. Automatic Flight Flashcards

1
Q

Automatic Speed Changeover Altitude

A

FL260

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2
Q

MCP Speed Condition Symbols

A
  • A: Underspeed limiting. Minimum speed
  • 8: Overspeed limiting. Vmo/Mmo, Landing Gear Limit, Flap Limit
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3
Q

Strange VNAV Disengagement Criteria

A
  • XTrack deviation exceeds twice the RNP,
  • During PATH descent with a database vertical angle,
  • LNAV not engaged
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4
Q

Manually Set N1 Caution

A

A/T may exceed the N1 limit

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5
Q

ALT HLD Switch

A

Commands pitch to hold uncorrected barometric altitude at which switch was pressed

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6
Q

ALT INTV Cruise Descent

A
  • More than 50NM from T/D and,
  • Selected MCP altitude above the first altitude restriction,
  • Otherwise Early Descent is initiated
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7
Q

LNAV Bank Angle Limits for T/O

A
  • 15 degrees below 200FT,
  • 30 degrees above 200FT
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8
Q

White LNAV Armed Flashing White On the Ground

A

Required FMC data (e.g. valid radio altitude) is not available

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9
Q

LNAV Engagement Criteria Inflight

A

If within 3NM of active route:
- With any heading,

If outside of 3NM of active route:
- On intercept course of 90 degrees or less and,
- Intercept route segment before active WPT

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10
Q

VOR/LOC Localizer Capture

A
  • Not later than 1/2 dot deviation,
  • When localizer frequency selected VHF NAV automatically switches from tail to nose antenna,
  • If switching does not occur, LOC mode is inhibited
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11
Q

Bank Angle Selector Affected Modes

A
  • HDG SEL and,
  • VOR
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12
Q

HDG SEL Turn Direction

A
  • Initial selection commands turn in the shortest direction toward selected heading bug,
  • After engagement, roll commands are the same direction as rotation of heading selector
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13
Q

Latest Altitude to Engage 2nd A/P

A

800FT RA

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14
Q

APP Mode Diseangagement After LOC and G/S Capture

A
  • Pushing TOGA switch,
  • Disengaging A/P and turning off both F/Ds,
  • Retuning the VHF NAV Receiver
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15
Q

Glide Slope Capture Point

A

2/5 dot below Glideslope

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16
Q

F/D Deviated Operation to A/P

A
  • While Pitch Command is more than 1/2 scale from center,
  • Pushing CMD switch engages the A/P in CWS for Pitch,
  • Related F/D Bars retract
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17
Q

CWS Engage Switch

A
  • CMD not displayed in A/P status display,
  • If F/D switches ON, FD annunciates in A/P status diplay,
  • A/P does not follow commands while in CWS
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18
Q

CWS Roll Heading Hold

A
  • If aileron pressure released within 6 degrees or less bank,
  • A/P rolls wings level and hold existing Heading

Inhibited when:
- Below 1500FT RA with Gear Down,
- After LOC capture in APP,
- After VOR capture with TAS 250KT or less

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19
Q

Steady Autopilot Disengage Light

A
  • Stabilizer out of trim below 800FT RA on Dual Channel Approach,
  • ALT ACQ Mode inhibited during A/P Go-Around if stabilizer not trimmed for Single A/P operation,
  • Automatic Ground System tests fail
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20
Q

STAB OUT OF TRIM Light

A
  • Operates only with A/P engaged,
  • Means A/P not rimming stabilizer properly
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21
Q

AFS

A
  • Automatic Flight System,
  • Consists of Autopilot Flight Director System (AFDS) and the A/T
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22
Q

MCP Switch Lights and Disengagement

A
  • If illuminated it means can be deselected,
  • ## If not illuminated it can’t be deselected,All modes can be disengaged by:
  • Selecting another mode and,
  • Disengaging A/P and turning F/Ds OFF
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23
Q

A/P Automatic Disengagement

A
  • Related IRS Failure or FAULT light,
  • Loss of related electrical power,
  • Loss of a sensor input,
  • Loss of related Hydraulic System,
  • Stick Shaker activates and persists for longer than 5 minutes
24
Q

Radio Altimeter Inoperative Operation

A
  • If failed side A/P used during ILS Approach,
  • A/P will disengage 2s after LOC and GS capture
25
Q

Independent F/D Operation

A
  • APP Mode engaged with LOC and G/S captured,
  • GA Mode engaged below 400FT RA,
  • TO Mode engaged below 400FT RA
26
Q

Generator Fail Below 800FT During Approach/Takeoff

A

FCC on the unaffected side positions the F/D command bars on both attitude indicators

27
Q

A/T Modes

A
  • GA: A/T maintains thrust at Reduced Go-around setting
  • THR HLD: Thrust Lever A/T servos inhibited, pilots can set the thrust manually
  • ARM: Difference from THR HLD = No A/T mode engaged. and Minimum Speed Protection is provided
28
Q

TOGA Takeoff F/D Guidance

A
  • 10 degrees nose down,
  • Roll Command is HDG SEL,
  • A/T is engaged in N1 mode,
  • At 60KT, 15 degrees nose up until sufficient climb rate is acquired then to maintain MCP Speed + 20KT,
  • If engine fails on the ground, Pitch target is V2 or liftoff speed whichever is greater,
  • At 84KT A/T modes changes to THR HLD until 800FT AGL then changes to ARM
29
Q

TOGA Guidance When F/D Switches OFF

A

Can be engaged by pressing TOGA switches when:
- After 80KT and,
- Below 2000FT AGL and,
- Within 150s after liftoff

30
Q

TOGA Go Around Arming Criteria

A
  • Not in T/O Mode,
  • Below 2000FT RA,
  • Above 2000FT with Flaps Extended or G/S captured
31
Q

A/T EEC Recommendation

A
  • Both EEC be ON or ALTN,
  • This produces minimum Thrust Lever Seperation
32
Q

Autothrottle Automatic Disengagement

A
  • 2s after touchdown,
  • A/T system fault,
  • Thrust Levers seperated more than 10 degrees (except GA mode),
  • Significant thrust difference along with control wheel roll input of 10 degrees or more (except GA mode)
33
Q

Pitch Commands After T/O With OEI

A
  • V2 if airspeed is below V2,
  • Existing speed if speed is between V2 and V2 + 20KT,
  • V2 + 20KT if speed is above V2 + 20KT
34
Q

Second Push of TOGA During T/O

A
  • Below 800FT AGL, N1 limit bugs increase to full GA limit but thrust levers will not move,
  • Above 800FT AGL N1 limit bugs increase to full GA limit and thrust levers advance toward full GA thrust
35
Q

Engaging A/P During T/O

A
  • Pitch Mode changes to LVL CHG,
  • Roll Mode changes to HDG SEL unless another mode has been selected,
  • MCP IAS and airspeed cursor changes to V2 + 20KT
36
Q

Terminating T/O Mode

A
  • Below 400FT AGL: F/D switches must be turned OFF,
  • Above 400FT AGL: Selecting another pitch mode, Engaging A/P
37
Q

Dual Channel Approach Self Test

A
  • After LOC and G/S captured and below 1500FT RA,
  • 2nd A/P couples with the flight controls,
  • ILS Deviation Monitor System test is performed (LOC and G/S display turns amber and flashes),
  • FLARE armed annunciated,
  • SINGLE CH extinguishes CMD illuminates,
  • A/P Go-around mode arms but is not annunciated
38
Q

Dual Channel Approach Important Altitudes After Test

A
  • 400FT RA: Stabilizer trimmed an additional amount nose up,
  • 350FT RA: If FLARE is not armed both A/Ps disengage automatically,
  • 50FT RA: FLARE mode engages and F/D bars retract,
  • 27FT RA: RETARD mode engages,
  • A/T automatically disengages approximately 2s after touchdown
39
Q

A/T Go Around Mode Criteria

A
  • Below 2000FT RA (if both RA failed below 15500FT),
  • With or without AFDS,

If above 2000FT RA (> 15500FT) with Flaps Extended or G/S captured:
- A/T will repond TOGA switch,
- But will engage in N1 mode and not the Reduced Go-around Thrust mode

40
Q

A/P Go Around

A
  • Armed when FLARE is armed until A/P sensing touchdown,
  • A/T engages in GA, using reduced GA thrust,
  • TOGA Mode ınitial pitch 15 degrees to achive 1000-2000FPM,
  • Then commands target speed for each Flap setting based on MTOW as you retract flaps,
  • Roll mode annunciation is blank but commands to hold current ground track,
  • And for some aircrafts LNAV will engage at 400FT AGL
  • IAS/Mach display is blank
41
Q

Pressing TOGA After Touchdown

A
  • A/P if engaged, disengages,
  • A/T may command GA thrust
42
Q

Second Push of TOGA During GA

A
  • GA changes to N1,
  • N1 limit increases to Full Go-around limit,
  • Thrust levers advance to full go-around limit
43
Q

TOGA Mode Termination From A/P Go-Around

A
  • Below 400FT RA, disengage A/P and turn OFF F/Ds,
  • Above 400FT RA, select a different Pitch or Roll Mode,
  • If Roll Mode changed first: Roll mode engages in Single A/P (first selected) and Pitch mode stays in dual channel,
  • If Pitch Mode changed first: 2nd A/P disengages, Pitch mode engages in Single A/P (first selected) and Roll mode changes to CWS R
44
Q

A/T Go Around Mode Termination

A
  • Selecting another pitch mode,
  • ALT ACQ engages
45
Q

F/D Go-Around Mode Criteria

A
  • Below 2000FT RA,
  • Not in T/O mode,
  • Above 2000FT with Flaps Extended or G/S captured,
  • After touchdown with wheel spin up
46
Q

F/D Go-Around Mode

A
  • Below 2000FT RA A/T engages in GA, using reduced GA thrust (Above 2000FT N1 and full go-around limit),
  • A/P disengages,
  • TOGA mode initial pitch 15 degrees to achive 1000-2000FPM,
  • Then commands target speed for each Flap setting based on MTOW as you retract flaps,
  • Roll mode annunciation is blank but commands to hold current ground track,
  • And for some aircrafts LNAV will engage at 50FT AGL
  • IAS/Mach display is blank
47
Q

TOGA Mode Termination From F/D Go-Around

A
  • Below 400FT RA, disengage A/P and turn OFF F/Ds,
  • Above 400FT RA, select a different Pitch or Roll Mode,
  • If Roll Mode changed first: Roll mode engages in selected mode and Pitch mode stays in TOGA,
  • If Pitch Mode changed first: Pitch mode engages in selected mode and Roll mode changes to HDG SEL,
  • Engaging A/P automatically engages LVL CHG for Pitch
48
Q

Single Engine F/D Go-Around Differences

A
  • MCP Speed window is open,
  • Initial Pitch Attitude is 13 degrees,

If engine failure occurs after Go-around, target speed depends whether 10s passed since G/A engagement:
- If within 10s: MCP Approach Speed,
- After 10s and Speed is within 5KT of G/A Engagement Speed: G/A Engagement Speed,
- After 10s and Speed is more than 5KT of G/A Engagement Speed: Present Speed

49
Q

LNAV in Lieu of Track Hold

A
  • For some aircrafts,
  • If missed approach exists in the flight plan and FCC are capable of entering go-around,
  • During approach with FLARE armed if LNAV armed after 400FT AGL LNAV engages,
  • During approach without FLARE armed if LNAV armed after 50FT AGL LNAV engages
50
Q

AFS Operation in Windshear

A

T/O or G/A:
- F/D commands to maintain speed until V/S decreases to +600FPM,
- Then commands 15 degrees nose-up until Stick Shaker is reached,
- Then commands intermittent activation of the Stick Shaker

APP and LDG:
- No recovery guidance unless TOGA pressed

51
Q

Command Speed Limiting

A
  • For: Vmo/Mmo, Flap Placards, Landing Gear Placard, Minimum Speed
  • Speeds greater than Vmo/Mmo cannot be selected,
  • The others limit speeds may be selected,
  • AFS allows acceleration or deceleration to slightly short of the limit then commands the limit speed,
  • Overspeed/Underspeed symbol appears in the MCP when commanded speed cannot be reached,
  • 15KT or greater speed must be selected to remove underspeed symbol
52
Q

Minimum Speed Definition

A

1.3Vs for the current Flap Configuration

53
Q

Reversion Modes

A
  • Modes for Placard Limit and Minimum Airspeed Reversions,
  • Both AFDS and A/T have reversion modes which activate slightly before reaching the limit speed
54
Q

Placard Limit Reversion

A
  • For Gear, Flap or Vmo/Mmo,
  • Overspeed limiting symbol appears in the MCP,
  • AFDS engaged but not in CWS or Speed mode and A/T is armed but not in Speed control: A/T reverts to SPEED,
  • If AFDS or A/T is in Speed control: Speed maintained slightly below the placard limit,
  • If A/T not available, no reversion for Gear or Flap placard limits

For Vmo/Mmo only:
- If A/T is engaged in a speed mode and thrust levers are IDLE and,
- If AFDS in V/S or CWS P mode, will change to LVL CHG,
- If A/T not available, AFDS reverts to speed control for Vmo/Mmo

55
Q

Minimum Speed Reversion

A
  • If actual Speed becomes equal or slightly less than minimum speed, underspeed symbol appears,
  • If operating in V/S or CWS P modes, AFDS reverts to LVL CHG,
  • Also reverts from VNAV PTH except flying level segment,
  • AFS commands 5KT above minimum speed and when reached underspeed symbol disappears,
  • If thrust levers not advanced AFDS commands nose down pitch
56
Q

Minimum Speed Reversion Exceptions

A
  • No reversion to LVL CHG when Flaps are greater than 12.5,
  • When A/T is OFF and AFDS in ALT HLD or G/S mode,
  • During LVL CHG climb with commanded minimum speed and minimum ROC cannot be maintained,
  • Also in this case A/P disengages and F/D bars retract

FCOM System Description (10 decks)

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