(5)  
Shutdown engine according to Chapter 71, Power Plant.

(6)  
Position GRAVEL PROTECT or ANTI-FOD switch to OFF.

E.P.R. SETTING  PRESSURE 
REQUIRED (PSIG)  ACTUAL (PSIG) 
MINIMUM  MAXIMUM 
IDLE 1.17 1.40  10 50 53  60 60 57 

D.  Restore Airplane to Normal Configuration
(1)  
Open MASTER DIM BUS, DIM and TEST circuit breakers.

(2)  
Remove pressure gage connection at tee on air sensing line and install tube cap.

(3)  
Close left and right side engine cowl panels.

(4)  
Close MASTER DIM BUS, DIM and TEST circuit breakers.

(5)  
If no longer required, remove electrical power from airplane.

5C8 
75-09-100 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/83 

2.  Engine Gravel Protection System Circuit Operational Test (Engines Running)
A.  Prepare to Test Engine Gravel Protection System
(1)  
Open left and right side engine cowl panels of engine to be tested.

(2)  
Check that engine gravel protection valve is closed.

NOTE:  The valve has a position indicator which can be seen when the valve is viewed from the right side of the engine.

(3)  
Provide electrical power.

(4)  
Check that the following circuit breakers are closed:

(a)  
Applicable ENG GRAVEL PROTECT or ENG ANTI-FOD circuit breaker

(b)  
Nine (9) MASTER DIM BUS circuit breakers

(c)  
DIM and TEST circuit breakers

B.  Test Engine Gravel Protection System
(1)  
Press-to-test applicable ENG GRAVEL PROTECT or ENG ANTI-FOD light on the P2-2 panel.

(2)  
Start engine in accordance with Chapter 71, Power Plant.

(3)  
Check that GRAVEL PROTECT or ANTI-FOD switch is on.

(4)  
Run engine at idle and check that the applicable GRAVEL PROTECT or ENG ANTI-FOD light illuminates and the gravel protection valve is open.

(5)  
Push the ground sensing test button on the M338 landing gear module on the E3-2 shelf. The light shall extinguish.

(6)  
Release the GROUND SENSING test button. The lights shall illuminate.

(7)  
Position switch to ANTI-ICE/TEST. The GRAVEL PROTECT or ANTI-FOD light shall remain illuminated.

(8)  
Momentarily depress the GROUND SENSING test button on the M338 landing gear module on the E3-2 shelf. The light shall remain illuminated.

(9)  
Open applicable ENG GRAVEL PROTECT or ENG ANTI-FOD circuit breaker. Applicable ENG GRAVEL PROTECT light shall extinguish and gravel protection valve shall close.

(10)
Close applicable ENG GRAVEL PROTECT or ENG ANTI-FOD circuit breaker. Applicable ENG GRAVEL PROTECT or ENG ANTI-FOD light shall illuminate and gravel protection valve shall open.

(11)
Shut down engine in accordance with Chapter 71, Power Plant.

(12)
Check that GRAVEL PROTECT or ANTI-FOD switch is off.

(13)
Close left and right side engine cowl panels.

(14)
Repeat all steps from 2.A.(1) through 2.B.(13) for the other engine.

(15)
If no longer required, remove electrical power.

5C8 
Oct 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  75-09-100 Page 503 

5C8 
75-09-100 Page 504  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/83 

ENGINE GRAVEL PROTECTION VALVE - REMOVAL/INSTALLATION
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510
1. General
A.  The engine gravel protection valve is located below the engine just aft of the nose cowl. Access to the valve is gained by opening both engine cowl panels (Ref 71-11-11, Engine Cowl Panels).
2.  Remove Engine Gravel Protection Valve (Fig. 401)
A.  Open applicable ENG GRAVEL PROTECT OR ENG ANTI-FOD circuit breaker at P6 circuit breaker panel.
B.  Open left and right side engine cowl panels.
C.  Disconnect electrical connector on valve.
D.  Disconnect valve air sensing line.
E.  Loosen couplings which secure valve to engine gravel protection air ducts.
F.  Support valve and push couplings towards air ducts to clear valve flanges. Remove valve and discard gaskets.
3.  Install Engine Gravel Protection Valve (Fig. 401)
A.  Using new gaskets, position valve between air ducts.
B.  Secure valve to air ducts with couplings. Tighten bolts to recommended torque.
C.  Connect air sensing line to downstream air duct.
　
中國(guó)航空網(wǎng) m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：737 AMM 飛機(jī)維護(hù)手冊(cè) 點(diǎn)火 空氣 AIR(4)