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* CMD
* CWS P
* CWS R.
CWS Reversion From CMD
Engage A/P A in CMD and push the HDG SEL and ALT HLD
mode selector switches. This engages the A/P in a roll and pitch
mode. The FMAs show these annunciations:
* ALT HOLD
* HDG SEL
* CMD.
Apply force to the control wheel and the control column until the
A/P reverts to the CWS modes. The FMAs show these
annunciations:
* CMD
* CWS P
* CWS R.
DFCS - OPERATION - GROUND OPERATIONS - CONTROL WHEEL STEERING
EFFECTIVITY
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DFCS - OPERATION - GROUND OPERATIONS - CONTROL WHEEL STEERING
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General
When you need to accurately measure the B dimension of the
stabilizer, use the trammel bar or a steel measurement tape.
Measure the distance between the center of the upper gimbal
pin and the center of the lower gimbal pin.
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DFCS - TRAINING INFORMATION POINT - STABILIZER B DIMENSION
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General
Maintenance action on the DFCS occurs only after the crew
reports a problem in the flight log. The report occurs when a
failure on the airplane causes a flight deck effect, such as
autopilot A disengages. You use the built in test equipment
(BITE) with the fault isolation manual (FIM) to find the problem.
BITE has these main properties:
* BITE uses the FMCS CDUs
* BITE shows all current failures and finds the line replaceable
units (LRU) with the failures
* BITE lets you do a test of the LRU interfaces after you change
an LRU
* BITE lets you do a rigging test of the system actuators and
sensors
* BITE stores and shows failures for the last 40 flights.
When in BITE, all of the tests that the DFCS can do are in the
DFCS ground maintenance BITE library.
BITE Library
The BITE library lists all of the DFCS tests. The library of tests
has these five sections:
* Interface - LRU interfaces and signal data buses
* Surface - flight control surfaces and sensors
* MCP - mode control panel tests
* Annunciators - lights and warnings
* FCC (internal) - selftest and discrete inputs.
The graphic shows the different library tests, with their test
numbers, in each section.
Groups
When the DFCS runs a test of a system, it groups all the tests
from the library that it needs to do the system test. The group
has a name and a number. The graphic gives two examples of
groups. One is the current status test group (group 10) and the
other is the autoflight test group (group 11).
When BITE does a test, it shows data about the test on the CDU.
The group test data will show on the CDU as **Group
name**Group number.library test number. For example, if
BITE does the CDS test as part of the autopilot test group, the
CDU will show **AUTOPILOT TEST**11.25.
The tests in the group may be divided into these three
categories:
* Autotest
* Interactive
* Surface.
Autotest
Tests in this category do not need any inputs from the BITE
operator and do not need hydraulic power. These tests can run
very quickly.
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