S 796-269
 (7)  Do these steps to find the seal leakage for the rudder power control unit (system B):
 (a)  
Move the rudder pedal to the full left position and hold.

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

 Amperage _______________(Subtract System B Basic Current First)
 Flow _______________ cc/minute (value 3)
 (c)  
Release the rudder pedals.

 (d)  
Subtract the Value 1 flow from the Value 3 flow. The
 difference must be less than 1200 cc/minute.

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737-300/400/500MAINTENANCE MANUAL
 (e)  
Move the rudder pedal to the full right position and hold.

 (f)  
Read the amperage or the flow value and write it here: Amperage _______________(Subtract System B Basic Current First)

 Flow _______________ cc/minute (value 4)
 (g) (h)  Release the rudder pedals.Subtract the Value 1 flow from the Value 4 flow. difference must be less than 1200 cc/minute. The

 S 866-270
 (8)  
Remove hydraulic power from system B (AMM 29-15-00/201). S 866-272

 (9)  
Connect the equipment that is necessary to measure the flow to hydraulic system A.

 S 866-271 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES. 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.
 (10)
 Supply hydraulic power to system A. S 216-274

 (11)
 Make sure the pressure in system A is a minimum of 2800 psi. S 976-275

 (12)
 If you use the ammeter or amp-clamp method do this step: NOTE: This amperage is the System A Basic Current, and must

____ be subtracted from all other system A 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 A Basic Current) Flow _______________ cc/minute (Value 5)
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737-300/400/500MAINTENANCE MANUAL
 S 976-276
 (13) If you use the flow meter method, read the flow value and write it here:
 Flow _______________ cc/minute (Value 5)
 S 796-278
 (14) Do these steps to find the null leakage for the rudder power control unit (system A):
 (a)  
Open the No. 2 isolation valve (in the tail compartment).

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

 Amperage _______________(Subtract System A Basic Current First)
 Flow _______________ cc/minute (value 6)
 (c)  Subtract the Value 5 flow from the Value 6 flow. The difference must be less than 3000 cc/minute.
 S 796-277
 (15) Do these steps to find the seal leakage for the rudder power control unit (system A):
 (a)  
Move the rudder pedal to the full left position and hold.

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

 Amperage _______________(Subtract System A Basic Current First)

 (e)  
Move the rudder pedal to the full right position and hold.

 (f)  
Read the amperage or the flow value and write it here: Amperage _______________(Subtract System A Basic Current First) Flow _______________ cc/minute (value 8)

 (g)  
Release the rudder pedals.

 (h)  
Subtract the Value 5 flow from the Value 8 flow. The difference must be less than 1200 cc/minute.

 Flow _______________ cc/minute (value 7)
 (c) (d)  Release the rudder pedals.Subtract the Value 5 flow from the Value 7 flow. difference must be less than 1200 cc/minute. The
　
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