(5)  
Open shutoff valve on air source.

(6)  
Gradually increase regulator setting until absolute pressure gage reads 1.5 times barometric pressure.

(7) 
 Close valve.

(8)  
Note pressure reading on absolute gage. A drop in pressure indicates line leakage. Correct as necessary to obtain zero leakage.

(9)  
With 1.5 times barometric pressure trapped in system, the EPR indicator must read 1.50 +

0.015.

(10)
Increase pressure with regulator until 2.20 times barometric is registered on absolute gage. Check that EPR indicator now reads 2.20 + 0.015.

(11)
If either check point is out of limits, install a serviceable indicator to determine whether transmitter or indicator is at fault.

(12)
Replace the faulty unit and recheck as per steps 9 and 10.

(13)
Disconnect engine PT7 line from test unit and reconnect line to 6 o'clock fitting of turbine exhaust case.

(14)
Close engine cowl panels.

501 
77-11-0 Page 506  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/85 

500  Engine Pressure Ratio Indicating System Test Connection 
Oct 20/83  Figure 502  77-11-0 
Page 507 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

INLET PRESSURE SENSING PROBE - REMOVAL/INSTALLATION
1.  General
A.  The engine inlet pressure (Pt2) sensing probe is assembled to the engine nose dome and is removed and installed with the dome.
2.  Remove Engine Inlet Pressure Sensing Probe
A.  Remove engine nose dome (Ref Chapter 71).
B.  Remove mounting bolts from brackets A and B (Fig. 401).
C.  Lift out inlet pressure sensing probe.
3.  Install Engine Inlet Pressure Sensing Probe
A.  Check the tubes of the inlet pressure sensing probe for foreign material and remove if present.
B.  Place probe inside the nose dome.
C.  Install mounting bolts (Fig. 401).
D.  Install engine nose dome (Ref Chapter 71).

543  Inlet Pressure Sensing Probe Installation 
Nov 01/75  Figure 401  77-11-11 
Page 401 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

ENGINE PRESSUR E RATIO TRANSMITTER - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Cleaning Solvent - General Purpose, Varsol No. 1, Esso Standard Oil Co., 15 West 51st Street, New York 19, New York
B.  Abrasive Cloth -Aluminum Oxide, Closed Coat, 180 grit or finer, Federal Specification P-C-451
2.  Remove Engine Pressure Ratio Transmitter (Fig. 401)
A.  Pull applicable ENGINE PRESS RATIO circuit breaker on circuit breaker panel P6.
B.  Obtain access to pressure ratio transmitter in air conditioning bay.
(1)  
For engine No. 1 transmitter, open access panel to left side of air conditioning bay.

(2)  
For engine No. 2 transmitter, open access panel to right side of air conditioning bay.

C.  Disconnect electrical connector from pressure ratio transmitter.
D.  Disconnect inlet (Pt2) and exhaust (Pt7) pressure lines from pressure ratio transmitter.
E.  Remove mounting bolts with washers and lift transmitter off mounting bracket.
501 
Feb 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  77-11-21 Page 401 

Engine Pressure Ratio Transmitter Installation  500 
77-11-21  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Install Engine Pressure Ratio Transmitter (Fig. 401)
A.  Prepare faying surfaces on transmitter and airplane structure for faying surface bond.
(1)  
Clean upper surface of mounting bracket around transmitter mounting holes with abrasive cloth to remove primer.

(2)  
Wash faying surfaces on mounting bracket and transmitter mounting bracket with cleaning solvent. Scrub as necessary to remove visible contamination. Dry immediately with lint-free cloth.

B.  Place transmitter in position on mounting bracket.
C.  Install mounting bolts with washers (Fig. 401).
D.  Connect inlet (Pt2) and exhaust (Pt7) pressure lines to transmitter.
E.  Perform Engine Pressure Ratio Indicating System test (Ref. AMM 77-11-0).
F.  Connect electrical connector to transmitter.
G.  Close access panel.
H.  Close applicable ENGINE PRESS RATIO circuit breaker.
　
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