(a)  To use the ammeter procedure, you connect an ammeter in series with one phase of the motor on the electric motor-driven pump (EMDP). To find the flow you measure the current subtract the basic current and use Figure 603 to change it to a flow.
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737-300/400/500MAINTENANCE MANUAL
A/P NO. __________________________________ PUMP MFR_________________________________ SERVICE NO. ______________________________DATE _____________________________________

A or B basic current (reference applicable step in section 8.C) before you
use Fig. 603.
2
Subtract only the flows; do not subtract the AMPS before you change them to flows. DFCS BITE Autopilot Actuator Internal Leakage Test Figure 605
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A 737-300/400/500MAINTENANCE MANUAL
 (b)  
To use the flowmeter procedure, you install a flowmeter on a hydraulic service cart and read the flow from it.

 (c)  
To use the amp-clamp and multimeter procedure, you put the amp-clamp adapter around one of the wires connected to a relay for the EMDP. You then read the current on the multimeter (that is connected to the amp-clamp adapter) subtract the basic current and use Figure 603 to get the flow. One person can do this procedure from the Control Cabin.

 (3)  
When you read the ammeter, make a record of the value to the nearest

 0.1 ampere. Use Figure 603 to change current to flow.

 (4)  
When you read the flowmeter, make a record of the value to the nearest 100 cc/minute.

 B. References
 (1)  AMM 29-15-00/201, Hydraulic Systems A, B, and Standby
 C. Access
 (1)  Location Zones
 101/102 Control Cabin
 216/217 Main Wheel Wells

 D. Procedure
 S 846-263
 (1) Do the Prepare for an Internal Leak Check procedure. Close the No. 1 through No. 6 isolation valves (in the tail compartment) (Fig. 604).
 S 866-264
 (2)  
If you use the ammeter procedure, set the ammeter to its highest range.

 (3)
Make sure the pressure in system B is a minimum of 2800 psi.

 S 216-265
 NOTE: System A hydraulic power must be off.
____
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 S 976-266
 (4)  If you use the ammeter or amp-clamp method do this step:
 NOTE: This amperage is the System B Basic Current, and must
____ be subtracted from all other system B amperage readings before you use Fig. 603 to find the equivalent flow.
 (a)  Read the amperage and write it here:
 NOTE: Write down a flow value of zero.
____
 Amperage _______________ (System B Basic Current)
 Flow _______________ cc/minute (Value 1)
 S 976-267
 (5)  If you use the flow meter method, read the flow value and write it here:
 Flow _______________ cc/minute (Value 1)
 S 796-268
 (6)  Do these steps to find the null leakage for the rudder power control unit (system B):
 (a)  
Open the No. 5 isolation valve (in the tail compartment) If not already open.

 (b)  
Read the amperage or the flow value and write it here:

 Amperage _______________(Subtract System B Basic Current First)
 Flow _______________ cc/minute (value 2)
 (c)  Subtract the Value 1 flow from the Value 2 flow. The
 difference must be less than 3000 cc/minute.
　
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