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Reverse Thrust Lever Interlock Actuator (L Eng)
This test applies to chapter 78. It makes sure that the interlock actuator for the reverse thrust lever operates correctly. The test makes sure the interlock relay drive circuit and feedback are okay for both EEC channels.
P2/T2 Probe Heat (L Eng)
This test applies to chapters 30 and 77. It automatically energizes the P2/T2 probe heater. The EEC automatically does a check of the probe heat relay drive circuit for each EEC channel and the probe heat power circuit.
FMU Fuel On And Fuel Off Solenoid (L Eng)
This test applies to chapter 73. It makes sure that the fuel-on and fuel-off solenoids in the FMU operate correctly. It also makes sure that there is aircraft electrical power to the solenoids.
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TIP -ENGINE SYSTEM TESTS

This test applies to chapters 73 and 75. It causes the EEC controlled air driven actuators to move to their minimum and maximum positions. This test makes sure that the air driven actuators can move through their full range and that their slew rate is correct. This test makes sure that both EEC channels can control the air driven actuators correctly. This test does a check on these components:
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2.9 start bleed

*
2.9 stability bleed

*
Nacelle zone vent shutoff

*
Turbine vane and blade cooling (TVBC) air shutoff valves.

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

TIP -ENGINE SYSTEM TESTS

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details. 

ENGINE COWLING -INTRODUCTION

The cowl contains and protects the engine components. The cowl also controls the airflow through and around the engine. Some of the engine cowl opens for maintenance access.
The engine cowl has four parts:
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Inlet cowl

*
Fan cowl

*
Thrust reverser

*
Turbine exhaust system.

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

ENGINE COWLING -INTRODUCTION

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ENGINE COWLING -GENERAL DESCRIPTION

The engine cowling is a cover that contains and gives protection to the engine components. The cowling also controls the airflow through and around the engine. Some parts of the engine cowling open for maintenance access.
　
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