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 water wash. Make sure no ice forms which could cause damage to the engine. Use Table 702 for the correct mixture.
 (f)  Mix 12.8 ounces (0.379 liters) of alkali cleaner with 115.2 ounces (3.411 liters) of potable water to make one gallon of cleaning solution.
 NOTE: This is 10% alkali cleaner and 90% potable water.
____
 (g)  Remove all the clamps which are necessary to move the EEC PT4.95 tube (AS02) away from the EEC PT4.95 manifold (AS03) (Fig. 703).
 NOTE: This will make a space for the installation of the
____
 cleaning adapters.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
EEC PT4.95 TUBE FWD SEE B
A
L-A1084
EEC PT4.95 Tube
Figure 703 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
EEC PT4.95 TUBE

TURBINE EXHAUST CASE
L-A4339 0288
EEC PT4.95 Tube Figure 703 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CAUTION: CONNECT THE CLEANING ADAPTER ONLY TO THE EEC PT4.95
_______
 MANIFOLD. THIS WILL PREVENT DAMAGE TO THE ELECTRONIC
 ENGINE CONTROL.

 (h)  
Install the applicable cleaning adapter to the EEC PT4.95
 manifold (Fig. 704).
 1) ENGINES PRE-PW-SB 72-134;

 Install the PWA 86457 Adapter to the EEC PT4.95 manifold. 2) ENGINES POST-PW-SB 72-134; Install the PWA 86458 Adapter to the EEC PT4.95 manifold.

 (i)  
Attach the PWA 86453 Pump to the adapter on the EEC PT4.95
 manifold (AS03) with the hose that is part of the pump.

 (j)  
Connect the PWA 86453 Pump to a shop air source and to a
 container of cleaning solution.

 (k)  
Put a container with a minimum capacity of 2 gallons (7.57 liters) under the engine, directly under Flange P, between the LPT (low pressure turbine) and the exhaust case.

 NOTE: This will collect the cleaning solution so it will not
____ drain on the ground or on the area under the engine.
 S 177-095-N00
 (2)  
Do the steps that follow to clean the EPR PT4.95 probes.

 (a)  
Set the inlet air pressure to the PWA 86453 Pump to 75-105 psig (517.1-723.9 kPa).

 (b)  
Make the one gallon (3.79 liters) of cleaning solution flow
 through the PT4.95 manifold and the PT4.95 probes.

 

 NOTE: The cleaning solution will go directly into the gaspath
____ area of the turbine exhaust case duct. The cleaning solution will probably also come through Flange P under the engine.
 CAUTION: IF THE ENGINE WILL BE IN AN AMBIENT TEMPERATURE OF 40°F
_______ (4.4°C) OR LESS BEFORE THE YOU OPERATE THE ENGINE AGAIN, MIX ANTIFREEZE WITH THE POTABLE WATER. THE ANTIFREEZE WILL MAKE SURE THAT THE WATER WILL NOT MAKE ICE IN THE EXHAUST CASE. ICE OR FROZEN LIQUIDS IN THE TURBINE EXHAUST CASE CAN CAUSE THE N1 ROTOR TO CATCH OR CAN CAUSE DAMAGE TO THE 6TH-STAGE LPT (LOW PRESSURE TURBINE) ROTOR.
 (c)  
Set the inlet air pressure to the PWA 86453 Pump to 75-105 psig (517.1-723.9 kPa).

 (d)  
Make the one gallon (3.79 liters) of potable water flow through the PT4.95 manifold and the PT4.95 probes.

 (e)  
Disconnect the pump at the quick disconnect fitting.

 (f)  
Attach a source of dry compressed air.

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