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You initially open the T/R halves to 37 degrees. Then, connect the forward hold-open rods to the extension adapters. You do not use the aft T/R hold-open rods. Now you can open the T/R halves to 45 degrees and let the hold-open rod collars lock. The hold-open rods transmit the weight of the T/R halves to the engine. This makes it safe to install the T/R hold-open tools.
Thrust Reverser Hold-Open Tool
The T/R hold-open tools let the strut hold the weight of the T/R halves. There is one tool for each T/R half.
The tool connects to strut adapters with quick-release pins. You remove the tool pin from the 37 degree open hole. Then, extend the tool and insert the pin in the 45 degree position. When you unlock the hold-open rod and lower the T/R half, the third (counting aft) upper bifurcation compression pad will come against the pad on the hold-open tool. With each tool installed, it is safe to continue the engine change.
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TIP -THRUST REVERSER HOLD-OPEN EQUIPMENT

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TIP -ENGINE DISCONNECTS (LEFT)

When you change an engine you must disconnect many things. You make the disconnects above the fan case and above the engine core just below the strut.
Fan Disconnects
There is a fan/strut disconnect panel above the fan case. The left side of this panel contains five electrical connectors and the left fan cowl PDOS hydraulic tube.
Core Disconnects
There is a core/strut disconnect panel on the left side of the engine that attaches to the bottom of the strut. The panel has eleven electrical connections.
The core/strut disconnect panel also has a strut drain line connection on the forward side of the panel.
The IDG terminal block is immediately forward of the core/strut disconnect panel. This is where the airplane power feeders and IDG power feeders connect. The airplane power feeders go through the front of the core/strut disconnect panel.
When you change an engine, you must also disconnect the left thrust reverser aft cowl load share strap and remove the pressure regulating and shutoff valve (PRSOV).
Training Information Point
The engine wires have these colors that show their purpose:
*
Blue -EEC channel A signals

*
Green -EEC channel B signals

*
Gray -non-EEC signals

*
Yellow -thermocouple signals.

Each engine wire harness bundle has a white tracer cord on the outside of the bundle. You use the tracer cord to set the position of the engine wire harnesses correctly when you install the wire harness. The tracer cord should face out (radially outboard) when you install the wire harness correctly.
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