(d)  
Position 15 and 20 extend the flaps to 15 and 20 degrees with the slats still partially extended (no gap).

 (e)  
Position 25 and 30 extends the flaps to 25 and 36 degrees, and fully extends (full-gapped) the slats.

 (f)  
Detent positions 5, 15, and 20 are normally used for takeoff. Detent positions 25 and 30 are normally used for landing.

GO AROUND
`

C
L FLAP LEVER IN RETRACTED DETENT C
L FLAP LEVER IN FULL DOWN "FLAPS 1" POSITION
NORMAL TAKEOFF RANGE DETENT (LANDING)
Flap Lever/Flap Slat Positions Figure 24
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757 MAINTENANCE MANUAL
 AUTOFLIGHT BITE - DESCRIPTION AND OPERATION
___________________________________________
 1.  General_______
 A.  Autoflight BITE provides an automated, rapid means of testing and verifying the operational status of line replacable units associated with autoflight. BITE testing can be performed with a minimum of effort using only equipment installed on the airplane. Functions contributing to BITE include:
 (1)  
Built-In-Test-Equipment in individual LRUs.

 (2)  
Built-In-Tests in individual LRU software.

 (3)  
Monitor and reporting functions in individual LRUs.

 (4)  
Control and display functions provided by the Maintenance Control Display Panel (MCDP).

 B.  Autoflight BITE includes monitoring and reporting in-flight faults and conducting ground tests.
 (1)  
Flight fault data is available in two categories.

 (a)  
Last flight faults contains all fault data detected during the last flight leg, and represents current fault data.

 (b)  
Previous flight faults contains historical fault data from previous flights.

 (2)  
Ground tests provide a means of exercising and testing hardware on the ground. Three general categories of tests are available.

 (a)  
LRU tests provide testing of specific LRUs in the autoflight systems. There are 15 LRU tests.

 (b)  
System tests exercise the autoflight systems, including LRUs, interfaces, and supporting systems. There are 2 system tests.

 (c)  
Support tests exercise and monitor supporting functions and components. There are 12 support tests.

 C.  BITE messages are provided in four categories.
 (1)  
Fault messages identifying specific problems.

 (2)  
Diagnostic codes providing amplifying data on selected faults.

 (3)  
Status information related to selected functions or components.

 (4)  
Instruction/questions related to BITE operation and interactive testing requiring operator actions.

 2.  Component Details_________________
 A.  Autoflight BITE is supported by a hardware network and series of software controlled tests. Hardware components and interfaces are shown in Fig. 1.
 (1)  
Most autoflight BITE functions are associated with the Maintenance Control Display Panel (MCDP). Three major systems interface with the MCDP, providing fault data for system components and interfacing LRUs. These systems are: Autopilot/Flight Director System

 Thrust Mangement System Flight Management Computer System

 (2)  
The Yaw Damper System and associated LRUs provide a BITE independent of the MCDP.

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757
MAINTENANCE MANUAL

Autoflight Bite Components
Figure 1

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