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* A/T mode changes from MCP SPD to RETARD
* A/T mode lights are off.
If the DFCS is not engaged for the approach, the A/T goes into
flare retard at 27 ft radio altitude if on glideslope in MCP SPD
mode and flaps more than 12.5 degrees.
A/T SYSTEM - OPERATION - APPROACH
EFFECTIVITY
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The A/T disengages two seconds after touchdown. The A/T
mode on the FMA is blank. There are no aural or visual
warnings when the A/T disengages during a normal landing.
A/T SYSTEM - OPERATION - APPROACH
EFFECTIVITY
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A/T SYSTEM - OPERATION - APPROACH
A/T SYSTEM - OPERATION - APPROACH
EFFECTIVITY
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General
During approach to landing while on glideslope, the A/T is in the
speed mode and controls engine thrust to control to the
selected MCP airspeed. The A/T arms for go-around when
below 2000 feet RA. After it is armed, if you push TO/GA during
the approach, the A/T goes to the go-around mode and
increases thrust for go-around climb.
The A/T may be used for go-around with or without the DFCS
engaged. For an autopilot go-around, both autopilots must have
been engaged in command mode prior to pushing TO/GA.
During go-around, the DFCS uses the elevators to control pitch
to hold the airspeed selected on the MCP, while the A/T controls
thrust.
Reduced Thrust Go-Around
You push a TO/GA switch to enter go-around mode. The A/T
moves the thrust levers forward and engine thrust increases for
the go-around climb. These are the indications for go-around:
* GA becomes the A/T mode on FMA (reduced thrust)
* T/Ls move forward for reduced thrust go-around
* GA is the FMC thrust mode
* N1 ref cursors are at FMC max go-around N1 limit.
After the first push of a TO/GA switch, the A/T commands
reduced go-around thrust to achieve a nominal climb rate. The
A/T calculates a thrust value to achieve an eight percent climb
gradient. Normally, this will be less than the full rated goaround
thrust available.
Maximum Thrust Go-Around
During go-around when you push a TO/GA switch a second
time, the A/T moves the thrust levers to the full-rated go-around
N1 calculated by the FMC. The A/T mode indications on the
FMA and the FMC thrust mode indications on the engine display
are the same as for reduced thrust go-around except for these
changes:
* A/T changes from GA to N1 mode on FMA (max thrust)
* T/Ls move forward to FMC N1 limit for max thrust.
Level-Off At Altitude
During go-around, the DFCS pitch mode annunciates TO/GA on
the FMA. When the airplane gets near the MCP altitude, the A/P
acquires and levels off at this altitude and goes to ALT HOLD
mode. The A/T mode changes from N1 (or GA) to MCP SPD as
the A/T controls the thrust levers to control to the airspeed
selected on the MCP.
A/T SYSTEM - OPERATION - GO-AROUND
EFFECTIVITY
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A/T SYSTEM - OPERATION - GO-AROUND
A/T SYSTEM - OPERATION - GO-AROUND
EFFECTIVITY
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General
To start A/T BITE, these conditions are necessary:
* Both EECs inactive (both start levers in CUTOFF position and
both engine start switches OFF) or both engines off (N2 less
than 50%)
* FMC is valid
* A/T BITE request from the CDU.
After you push A/T, LSK L3, on the maintenance BITE index
page, the CDU shows one of two pages. If the A/T system starts
BITE, the CDU shows the A/T BITE TEST menu and both A/T
warning lights come on. If the A/T system fails to start BITE, the
CDU shows the A/T BITE INOP page.
A/T BITE TEST Main Menu
This page lets you choose a fault isolation or verification test.
A/T BITE INOP
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