4 Automatic Flight Flashcards
C/O (change over switch) IAS/Mach display
- auto change over:
- underspeed
- overspeed
- blank when’
- display range
A - above FL260
U - “A”, select Vmin + 15kts to get rid of “A”
O - “8”, by selecting VMO or MMO limit, landing gear limit, flap limit
B - VNAV, FMC SPD, 2 ENG GA
D - 100 KIAS - VMO in 1 KIAS increment
.60M - MMO in 0.01 M increments
n1 mode engages automatically:
depressing N1/SPEED
- will cause:
- engaging VNAV in climb
- engages LVL CHG (except first 2.5min after Takeoff)
D - A/T in arm MODE
Speed mode engages automatically:
- ALT ACQ/HOLD engages
- V/S engages
- G/S capture occurs
VNAV ARM CRITERIA
- valid flight plan has been entered
- performance data has been entered and executed
- both FD switches ON
- above 400’ SGL it will automatically engage
VNAV TERMINATED
- selecting another pitch mode
- glideslope capture
- reaching end of LNAV route
- transition to G/S when G/S is armed
- crosstrack twice the RNP value during PTH DESCENT with active leg with database vertical angle and no LNAN engaged
When pitch mode VNV SPD to ALT ACQ
- will:
during intermediate level off (not CRZ ALT) the autothrottle will targer IAS (in stead of MACH) even above automatic change over altitude. This could cause overspeed
ALT DISPLAY
- range
- arming
- altitude upon power applied
VERTICAL SPEED DISPLAY
- range
0 to 50.000 feet in 100 feet increments. Rotating ALT SELECTOR will arm V/S. Displays previous selected altitude upon power applied
VSD
- range -7.900 to +6.000 feet/minute. >1000 f/min increments of 100 feet, <1000 f/min increments of 50 feet
inhibited modes after G/S capture
ALT HOLD and LVL CHG
ALTITUDE INTERVENTION
- push during VNAV Climb
- every push deletes lowest ALT constraint (from FMC)
- if MCP ALT above current FMC ALT, FMC cruise altitude will be only increased (not decreased) to MCP cruise altitude
ALTITUDE INTERVENTION
- push during VNAV cruise
- if MCP set higher than FMC, FMC ALT will be the MCP ALT and aircraft will climb
- MCP ALT set to lower altitude, but at or above alt constraint and further than 50nm from TOD, the aircraft will descent with 1000 feet/min
- MCP ALT set to lower altitude and lower than als constraint and > 50nm will initiate a descent with 1000 feet/min until path intercept OR MCP ALT LEVEL OFF occurs
ALTITUDE INTERVENTION
- push during VNV descent
- every push deletes highest alt constraint
- aircraft currently at alt constraint and MCP lower, deletion will allow aircraft to further descent
FLYING VNV PTH and all altitude constraints deleted
VNV SPD
LNAV ARMING CRITERIA
-origin RWY in flight plan
- active route entered in FMC
- track of first leg within 5 degrees of runway heading
- both FD’s ON
- LNAV selected prior to TOGA
LNAV
-activated
- bank angle limits
activated at 50 feet RA
bank angle limited to 15 degrees < 200 feet
bank angle limited to 30 degrees > 200 feet
LNAV engagement in flight
LNAV disconnect
Engagement:
- within 3nm
- within 90 degrees from track outside 3nm
Disconnect
- route disconuity
- end of route
- loss of capture criteria
- intercepting APP cours
When LOC frequency selected, what will antennas do
VNF NAV radios automatically switch from tail to nose antenna
bank angle selector
- for which modes
- all options
- for HDG SEL and VOR MODE
- 10,15,20,25,30
DUAL AP operations
- when used
for approach and must BOTH be tuned to ILS and prior to 800’ RA
APP MODE OPERSTIONS
- when does capture occurs
When app mode disengage
GS capture 2/5 dot below GS
LOC capture 1/2 dot deviation
LOC MUST be captured before GS can be captured’
D - TOGA, retuning VHF NAV, disengaging AP and Turning off FD
CSW
- From CWS P automatically to
- From CWS R automatically to
- Push
P - ALT ACQ -> ALT HOLD when reaching selected altitude
R - VOR/LOC when course intercepted
P - when control pressure released: A/P holds existing attitude. If ailerons pressure released with 6 degrees or less bank: the A/P rolls wings level and maintains HDG. HDG hold feature inhibits:
- below 1500’ with gear down
- after LOC capture in APP mode
- after VOR capture with TAS at or above 250 KTS
AUTOPILOT
- A/P disconnect switch: tone
- A/P disengage light 🛑 steady
Tone sounds for approximately 2 seconds
A/P 🛑 steady:
- stab out of trim below 800’m RA on Dual approach
- ALT ACQ mode inhibited during A/P GA if stabilizer not trimmed for single A/P
- Disengage light test switch in pos 2
- automatic ground system test fails;
Autothrottle disengage light
- A/T flashing 🟧
A/T flashing 🟧: indicates A/T airspeed error under following conditions:
- in flight
- flaps not up
- air speed differs from commanded value by +10 or -5 its and is not approaching commanded value
NEW FMA illuminate time
10 seconds
AUTOPILOT ENGAGEMENT CRITERIA
- no force to control wheel applied
- stab trim autopilot is at NORMAL
One IRU INOP, this will cause:
Yaw damper will disconnect when A/P in use
Dual channel A/P OPS
- criteria
Only with 2 generators are powering the busses
FCC: amount of radio altimeters
- what if one INOP with A/P on
2 independent radio altimeters
- A/P disconnects after 2 sec
Independent F/D operations.
- requirements:
When A/P is OFF AND:
- app mode with LOC/G/S capture
- GA more engaged below 400’ RA
- TO mode engaged below 400” RA
FAIL OPERATIONAL AUTOLAND
- LAND 3
- LAND 2
- failure below alert height and still capable of continuing the autoland + rollout
LAND 3: 2 autopilots, three inertial sources and associated sensors are operating normally for an automatic landing + rollout
LAND 2: failure occurred above Alert height and redundancy is reduced: but the autoland Is still capable of making auto land + rollout
- land 3 will remain displayed and the failure (autoland downgrade) will be shown below 40 KIAS
TO/GA ENGAGEMENT
TAKEOFF
- both FD OFF
GA
FD OFF: press after 80 Kias below 2000’ AGL and prior to 150 seconds after lift off
FD ON: AFDS will shown -10 pitch until 60 Kias, than +15 until sufficient climb rate than v2+15
GA:
- inflight below 2000 feet
- inflight above 2000 feet with flaps not up or G/S captured
FLARE
ROLLOUT
BOTH DUAL A/P APP
AP DISENGAGE
FLARE: arms below 1500’ and engages below 50’ RA, recedes thrust at 27’ RA
ROLLOUT: arms below 1500’ and 2 sec after touchdown A/T disengages
AP disengaged will end rollout guidance
Autothrottle ON
- levers difference
A/T disengage when:
L - 1 knob from each other
A- thrust levers separated > 10 degrees OR significant thrust difference along with control wheel roll input of 10 degrees or more
Pressing toga
- 84 KIAS
- ENG FAIL SPEED v2
- second press toga
84 - THR HLD
E - v2 - v2+20 KIAS
S - above 800’ full GA thrust “GA”
Climbing (VNV PTH or V/S) OR Descending (V/S)
aircraft automatically changes to LVL CHG when close to VMIN, VMO,MMO
MIN SPEED REVERSION NOT AVAILABLE
A/T OFF, AFDS IN ALT HOLD or AFTER G/S capture, VNAV PTH in level segment
