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Performance maintenance page
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EPCS maintenance page
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Propulsion data limits maintenance page
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Engine exceedance maintenance page.
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE CONTROLS -OPERATION
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ENGINE CONTROLS -TRAINING INFORMATION POINTS
Thrust Lever Check
You measure the force to move the thrust levers to make sure they are within limits. To move the reverse thrust lever, you must disconnect the T/R interlock actuator rod end from the thrust lever assembly.
TLA Resolver Adjustment
Each thrust lever connects to an ASM brake with an adjustable control rod. The ASM brake turns the TLA resolver. You adjust the length of the control rod to change the relationship between the thrust lever position and the resolver position. You make the adjustment with either portable ground support equipment (GSE) or with onboard equipment.
Adjustment -GSE
The most accurate method of adjustment for the TLA resolver is to use special GSE to:
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Measure the thrust lever position
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Excite the resolver
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Read the resolver angle.
With the thrust lever at idle, you turn the turnbarrel to change the length of the control rod to get the correct resolver angle. Jam nuts and safety wire hold the turnbarrel in position.
To make sure the adjustment is correct, you move the thrust lever to its full-forward position and back to idle. Read the resolver angle again. It should agree with the first number. You also check the resolver angle at the thrust lever positions of full-forward and full-reverse.
Adjustment -Onboard
You can adjust the resolver using airplane equipment. You supply the EEC with airplane power and read the TLA resolver angle (thrust resolver angle -TRA) on the electronic propulsion control system (EPCS) maintenance page 1.
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ENGINE CONTROLS -TRAINING INFORMATION POINTS
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D633W101-BEJ Jan 05/2003
