77-11-00
 ALL  ú ú N01 Page 6 ú Apr 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGINE PRESSURE RATIO INDICATING SYSTEM - ADJUSTMENT/TEST
_________________________________________________________
 1.  General
_______
 A.  This task is an operational test of the engine pressure ratio (EPR) indicating system.
 B.  To do a test of the EPR indicating system, you must operate all four engines.
 C.  Do this test to make sure the EPR system will operate if you replace the EPR (PT4.95) probe or EPR (PT4.95) manifold.
 TASK 77-11-00-715-002-N00
 2.  Engine Pressure Ratio Indicating System Operational Test (Fig. 501)
________________________________________________________
 A.  References
 (1) AMM 24-22-00/201, Manual Control
SEE A
MAIN EICAS DISPLAY
A

Engine Pressure Ratio Indication
Figure 501

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 77-11-00
 ALL  ú ú N01 Page 501 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(2)  
AMM 31-61-00/501, Integrated Display System

 (3)  
AMM 32-09-02/201, Air/Ground Relays

 (4)  
AMM 71-00-00/201, Power Plant

 B. Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C. Preconditions
 S 865-005-N00
 (1)  These conditions are necessary for this task:
 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System serviceable (AMM 31-61-00/501).

 (c)  
Airplane must be in the Ground Mode (AMM 32-09-02/201).

 (d)  
The engine must be operational (AMM 71-00-00/201).

 D. Procedure
 S 865-001-N00
 (1)  Operate the engines at the same power.
 (a)  
Start the engines (AMM 71-00-00/201).

 (b)  
Make sure these engine parameters become stable and are approximately the same value: 1) N1 2) N2 3) EGT

 S 715-002-N00
 (2)  
Make sure that the EPR indication on the main EICAS display is approximately the same for each engine.

 (3)  
Stop the engines (AMM 71-00-00/201).

 S 865-003-N00
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 77-11-00
 ALL  ú ú N01 Page 502 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGINE PRESSURE RATIO (PT4.95) PROBE - REMOVAL/INSTALLATION
___________________________________________________________
 1.  General
_______
 A.  In this procedure, the engine pressure ratio (EPR) PT4.95 probe is referred to as the EPR probe. The exhaust gas temperature (EGT) TT4.95 probe is referred to as the EGT probe.
 B.  The two EPR probes are installed on the turbine exhaust case for each engine. The probes are installed at approximately the 4 o'clock and 10 o'clock positions. You can get access to the EPR probes when you open the core cowl panels.
 C.  You must remove the EGT probe before you can remove the EPR probe.
 TASK 77-11-01-004-001-N00
 2.  Remove the Engine Pressure Ratio (PT4.95) Probe (Fig. 401)
_______________________________________________
 A.  References
 (1)
AMM 71-11-06/201, Core Cowl Panels

 (2)
AMM 77-21-01/401, EGT (TT4.95) Thermocouple Probe

 (3)
IPC 77-11-01, Fig. 1

 B.  
Access

 (1)  
Location Zones 412 Engine 1 - Turbine Exhaust Case 4 or 10 o'clock 422 Engine 2 - Turbine Exhaust Case 4 or 10 o'clock 432 Engine 3 - Turbine Exhaust Case 4 or 10 o'clock 442 Engine 4 - Turbine Exhaust Case 4 or 10 o'clock

 (2)  
Access Panels
 417 Left Core Cowl Panel - Engine 1
 418 Right Core Cowl Panel - Engine 1
 427 Left Core Cowl Panel - Engine 2
　
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