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 S 226-007-N00
 (7)  Make sure the slots on the leading edge of the EPR probe are open to the minimum (width and length) dimensions (Fig. 601). (a) Replace the EPR (PT4.95) probe (AMM 77-11-01/401) if the slot dimensions are less than the minimum.
 S 226-008-N00
 (8)  Make sure the three discharge slots on the trailing edge of the EPR probe are open to the minimum (width and length) dimensions (Fig. 601). (a) Replace the EPR (PT4.95) probe (AMM 77-11-01/401) if the slot dimensions are less than the minimum.
 S 426-009-N00
 (9)  Install the EPR (PT4.95) probe (AMM 77-11-01/401).

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 77-11-01
 ALL  ú ú N01 Page 605 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGINE PRESSURE RATIO (PT4.95) MANIFOLD - REMOVAL/INSTALLATION
______________________________________________________________
 1.  General
_______
 A.  This section contains two tasks. One task is for the removal of the engine pressure ratio (PT4.95) manifold. The other task is for the installation of the manifold.
 B.  The manifold is installed on the turbine exhaust case.
 C.  The manifold connects two EPR probes. The probes are installed (one each) at the 4 and 10 o'clock positions.
 D.  You must open the core cowl panels to get access to the EPR (PT4.95) manifold.
 TASK 77-11-02-004-001-N00
 2.  Engine Pressure Ratio (PT4.95) Manifold Removal (Fig. 401)
_______________________________________________
 A.  References
 (1)  
AMM 71-11-06/201, Core Cowl Panels

 (2)  
IPC 77-11-02, Fig. 1

 B.  
Access

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

 (2)  
Access Panel
 417 and 418 Core Cowl Panels - Engine 1
 427 and 427 Core Cowl Panels - Engine 2
 437 and 438 Core Cowl Panels - Engine 3
 447 and 448 Core Cowl Panels - Engine 4

 C.  
Procedure

 (1)  
Open the core cowl panels (AMM 71-11-06/201).

 S 034-003-N00

 (2)  
Disconnect the manifold tube nuts from the adapters on the EPR probes at the 4 and 10 o'clock positions.

 S 014-002-N00
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 ALL  ú ú N01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A  FLANGE T FLANGE S  FLANGE P  FLANGE P  FLANGE S FLANGE T  SEE  B 
CASE EXHAUST TURBINE 
SEE  D 
(PT4.95) LEFT EPR MANIFOLD 
CASE TURBINE EXHAUST  ESEE CLAMP TUBE NUT  CLAMPS FSEE 
SEE  C  RIGHT EPR (PT4.95) MANIFOLD 
SEE  G  TEE 
SEE  H  A  TUBE NUT  A  CENTER EPR (PT4.95) MANIFOLD 
FWD  A  B  FWD 
Figure 401 (Sheet 1) Engine Pressure Ratio (PT4.95) Manifold Installation 

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 77-11-02
 ALL  ú ú N01 Page 402 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BRACKET
BOLT
CLAMP
NUT
4 O'CLOCK POSITION C
EEC PT4.95 PRESSURE TUBE
TUBE NUT
BOLT NUT CLAMP
FWD
TUBE NUT LEFT EPR (PT4.95) MANIFOLD
TUBE NUT EPR (PT4.95) PROBE
EPR
(PT4.95)
PROBE

TUBE NUT
BOLT
CLAMP
RIGHT
EPR (PT4.95)
MANIFOLD

10 O'CLOCK POSITION
LEFT
D
　
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