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A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | HYDRAULIC SYSTEM PERMITTED EXTERNAL LEAKAGE CHART | | TABLE 601 | ................................................................................ | | | MAXIMUM LEAKAGE | | PART | NORMAL LEAKAGE *[1] | FOR DISPATCH *[1] | | E. Other dynamic |1 drop each cycle |1 drop each cycle | | seals while they | | | | move *[5] | | | 2..........................….........................….........................1
 *[1]  There are approximately 20 drops in a cubic centimeter or 75600 drops
 in a gallon. *[2] Make sure the connection is tightened to the correct torque. *[3] A static seal is a seal between two parts that don't move relative to each
 other (Example: Manifold cover, pump housing cover). *[4] A dynamic seal is a seal between two parts that move relative to each other (Example: Piston rod seal, pump shaft seal, swivel seal).
 *[5]  The center vent on the rudder PCU is actually the drain for two dynamic seals. Thus, when evaluating leakage from the center vent at the rudder PCU, all dynamic seal limits can be doubled.
 TASK 29-00-00-846-006
 3. Prepare for an Internal Leak Check
__________________________________
 A. Special Tools and Equipment
 (1)  
Cable Assembly, Hydraulic Leak Check - F80135-1, or equivalent (Fig. 602)

 (2)  
Digital multimeter - Model 8024B, John Fluke Mfg. Co. Inc., Redmond, WA.

 (3)  
Amp-Clamp Adapter, AC Current - Model 80i-600, John Fluke Mfg. Co. Inc., Redmond, WA (used with digital multimeter)

 B. Standard Tools and Equipment
 (1)  
AC Ammeter - Amp ranges 0-25 and 0-50 with a short circuit selector switch. The switch contacts must be the make-before-break type to prevent arcing when you switch them. The meter scales most be accurate to 0.10 amp on the 0-25 scale and 0.20 amp on the 0-50 scale

 (2)  
Flowmeter - that can measure flows of 50 to 20,000 cc/min (a remote readout that you can put in the control cabin makes the job easier)

 (3)  
Hydraulic service cart - 0 to 3000 psi

 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 (3)  
AMM 32-00-01/201, Ground Lock Assemblies

 D. Access
 (1)  Location Zones
 101/102 Control Cabin
 216/217 Main Wheel Wells

 E. Procedure

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A 737-300/400/500MAINTENANCE MANUAL
Not Used
Figure 601

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F65589
A 737-300/400/500MAINTENANCE MANUAL

SHORT CIRCUIT SWITCH
Ammeter Wiring Harness for the A and B EMDP Figure 602
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737-300/400/500MAINTENANCE MANUAL
 S 846-007
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES DURING THE LEAK CHECK. THE AILERONS, RUDDER, ELEVATOR FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON ALL OF THE LANDING
_______ GEAR. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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