S 434-015-N00
(5)
Install the four connecting rods between the brake shaft and the position resolver for the thrust levers.
S 834-016-N00
(6) Do this task: Adjust the Thrust Lever Assembly (AMM 76-11-01/501).
S 834-017-N00
(7) Do this task: Adjust the Thrust Lever Position Resolvers
(AMM 76-11-02/501).
S 414-008-N00
(8)
Install the cross member on the left side of the control stand.
S 414-018-N00
(9)
Do this task: Install the Servomotor Generator Gearbox Assembly (AMM 76-12-01/401).
S 414-019-N00
(10)
Do this task: Install the Control Stand Side Panels (AMM 76-11-03/201).
S 444-020-N00
(11)
Do this task: Activation Procedure for the Autothrottle Servomotor (AMM 76-11-03/201).
S 444-021-N00
(12)
Do this task: Activation Procedure for the Captain and the First Officer Seats (AMM 76-11-03/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
AUTOTHROTTLE SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________
1. General
_______
A. The Autothrottle (A/T) System computation is done by the Thrust Management Function (TMF) of the Flight Management Computer (FMC). A description of the autothrottle is in the thrust management portion of the FMCS (AMM 34-61-00/001).
B. The Central Maintenance Computer System (CMCS) (AMM 45-10-00/001) monitors the FMCS for autothrottle related faults or failures and is accessed through the Control Display Unit (CDU). The CDU acts as the focal control and display to start and interact with BITE and to identify faults in systems monitored by the CMCS.
C. Faults or failures monitored by the CMCS show as maintenance messages on the CDU. Autothrottle faults or failures will show, therefore, on the CDU in maintenance messages identified by ATA Chapter 34-61, Flight Management (AMM 34-CMCS MESSAGE INDEX).
D. A receptacle in the main equipment center (when installed) permits a remote CDU to interface with the CMC. The remote CDU permits access to autothrottle related BITE, faults, or failures from the main equipment center.
E. The test of the autothrottle system is in the thrust management portion of the FMCS Adjustment/Test (AMM 34-61-00/501).
2. Autothrottle System Component Description
_________________________________________
A. Autothrottle Servomotor Generator, Gearbox, and Brake Assembly
(AMM 76-11-05/401 and 76-12-01/401)
(1)
The autothrottle servomechanism/brake assembly is a single unit which positions all thrust levers as commanded by the flight management computer.
(2)
The autothrottle servomechanism is connected indirectly to each thrust lever by a connecting rod and indirectly to each position resolver for the thrust lever by a second connecting rod, through the brake assembly.
(3)
The brake assembly supplies a friction feel force for the thrust lever and rotates to make contact with the interlock mechanism for the reverse thrust lever when reverse thrust is selected and the thrust reversers have not yet completed translation beyond the null thrust position which is 50 percent of the distance from stow to deploy.
B. Autothrottle Switches (AMM 76-12-02/401)
(1)
An autothrottle disconnect switch and a reset switch are found in thrust lever assembly 1, and also in thrust lever assembly 4.
(2)
The disengage switches are used to manually disengage the autothrottle system.
C. Go-Around Switches (AMM 76-12-02/401)
(1) Three switches are found in thrust lever assembly 2, and three are found in thrust lever assembly 3. Two of these switches are used to activate the takeoff and go-around mode of the autothrottle.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
76-12-00
ALL ú ú N01 Page 1 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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