503 
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502 
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Ram Air Modulation System Schematic  525 
21-52-0  Figure 2 (Sheet 1)  May 15/72 
Page 8 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

516  Ram Air Modulation System Schematic 
May 01/75  Figure 2 (Sheet 2)  21-52-0 
Page 9 
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Ram Air Modulation Schematic  501 
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RAM AIR SYSTEM - TROUBLE SHOOTING
1.  General
A.  If a system trips off from overheat but without excess air supply, the ram air system should be suspected. Check that ram air inlet and exhaust doors are open. Should foreign objects such as paper or cloth be ingested into the ram air system they could restrict airflow through the system. Inspection doors are provided in the ram air ducts forward of each heat exchanger for duct inspection. If difficulty occurred during flight while flaps were in any position other than fully retracted check-cooling system per adjustment/test procedure. If system has tripped off without excessive temperature being recorded, the thermal switches may be defective and should be checked per adjustment/test procedure.
2.  Equipment and Materials
A. Controlled Heat Source - Temp Cal Probe Heater (Attachment to Jet Cal Engine Analyzer)
3.  Trouble Shooting Chart
500 
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NOTE:  When an actuator has to be replaced because of an actuator motor failure the ram air control must be removed and bench checked per vendor requirements to prevent reoccurrence of actuator failure.
500 
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500 
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502 
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501 
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Pack Valve and Turbofan Valves Connectors Location  501 
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RAM AIR SYSTEM - ADJUSTMENT/TEST
1.  Ram Air System Test
A.  General
(1)  Three tests are presented for checking the ram air system. The Ram Air System Leakage Test provides a method for determining that the amount of leakage into the air conditioning equipment bay does not exceed the prescribed limits. The Ram Air System Operation Test provides a method for determining that ram air system will function correctly whether airplane is in flight or on the ground. During the test it is preferred that flaps are raised electrically; however, optional procedure to raise flaps hydraulically is also provided. The Ram Air System Drag Test provides a method for determining if mechanical friction of system is within limits. Each test is applicable to either right or left ram air system.
B.  Ram Air System Leakage Test
(1)  
Equipment and Materials

(a)  
Air source capable of delivering 15 pounds per minute at 2.5 psig.

(b)  
Flow meter capable of measuring airflow from 15 pounds per minute at 2.5 psig to 5 pounds per minute at 0.5 psig.

(c)  
Static pressure gage -0 to 2.5 psig.

(d)  
Ram Air Exhaust Plug
1) Preferred: F80233-( )
2) Optional: TE65-51575-( )

(e)  
Ram Air Inlet Plug
1) Preferred: F80155-( )
2) Optional: TE65-51201-( )

(2)  
Prepare Ram Air System for Test

(a)  
Lower air conditioning equipment bay doors.

(b)  
Install ram air exhaust plug to outside of exhaust louver frame with bolts.

(c)  
Remove ram air inlet modulation panel (Ref. 21-52-41).

(d)  
Remove ram air inlet deflector (Ref. 21-52-21).
　
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