TABLE OF CONTENTS
_________________
Chapter Section
Subject_______ Subject ____ Effectivity_______ Page ___________
Removal, Microswitches 231
Removal, Side Panels, 210
Control Stand Removal, STAB TRIM Indicator 233 Removal, Thrust Lever Rail 214
AUTOTHROTTLE SYSTEM 76-12-00
Description and Operation 1 ALL General 1 Description 1
Autothrottle Servomotor and 1
Brake Assembly Autothrottle Switches 1 Go-Around Switches 1
Inspection/Check 601 ALL
SERVOMOTOR GENERATOR AND GEARBOX 76-12-01
-AUTOTHROTTLE Removal/Installation 401 ALL SWITCHES - AUTOTHROTTLE 76-12-02
DISCONNECT AND GO-AROUND Removal/Installation 401 ALL Adjustment/Test 501 ALL
Switch Check - Disengage 501 Switch Check - Go-Around 506
EMERGENCY SHUTDOWN 76-20-00
__________________ ENGINE FIRE - EMERGENCY SHUTDOWN 76-21-00 Description and Operation 1 ALL Aural Warning Speakers 1 Engine Fire Switch 1 EICAS Main Display Screen 1 Fuel Control Toggle Switch 1 Master Warning Lights 1 Operation 6
76-CONTENTS
NGUN Page 4 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGINE CONTROL SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________
1. General (Fig. 1)
_______
A. Thrust commands from the flight crew or the thrust management computer are transmitted to the engine by the engine control system. The engine control system includes the thrust lever assembly, the brake assembly, the resolvers for the thrust lever position, the interlock actuator for the reverse thrust, the electronic engine control, and the fuel metering unit.
2. Thrust Levers
_____________
A. There are four thrust lever assemblies found in the control stand between the captain and the first officer.
B. Each thrust lever assembly includes a select handle for forward thrust and a select handle for reverse thrust.
(1) The reverse thrust lever is inhibited by the grounding latch on the reverse thrust lever from more than 8.5 degrees of lever travel when the forward thrust lever is moved more than 2 degrees of lever travel.
C. Each thrust lever assembly includes electrical control switches within the thrust lever housing.
D. Each thrust lever assembly is connected directly to the brake assembly by a connector rod.
E. Each thrust lever assembly is connected directly to a resolver for the thrust lever position through the brake assembly by a second connector rod.
3. Autothrottle Servomotor Generator, Gearbox, and Brake Assembly
______________________________________________________________
A. The autothrottle servomechanism/brake assembly is a single unit which moves all thrust levers as commanded by the flight management computer.
B. The autothrottle servomechanism is connected indirectly to each thrust lever by a connecting rod and indirectly to each resolver for the thrust lever position by a second connecting rod, through the brake assembly.
C. The brake assembly provides 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.
4. Thrust Lever Position Resolvers
_______________________________
A. There are four position resolvers for the thrust lever found below the floor under the aft end of the control stand in the control cabin. Each position resolver is connected to the brake assembly by a control rod.
B. The position resolver is a dual unit which supplies electrically isolated signals for the thrust lever position to the two channels of the Electronic Engine Control (EEC).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
76-11-00
ALL ú ú N01 Page 1 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
THRUST LEVER ASSEMBLIES
A
TOGGLE SWITCHES FOR THE FUEL CONTROL
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