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737-300/400/500MAINTENANCE MANUAL
 (j)  Standby Hydraulic System Internal Leak Check: You use this procedure to make sure the sandby hydraulic system does not have too much internal leakage.
 (3)  You can use this procedure to find the general internal condition of the hydraulic system. You can also use it for trouble-shooting the system.
 (a)  When you are trouble-shooting the hydraulic system, it is only necessary for you to do these procedures for the system (A or B) with the problem. You can feel for hot tubes or actuators, or listen for fluid leaks to find which parts have the problem. When you can, use standard tools to measure heat, vibration, or sound. Before you get near parts that move, operate them to make sure they can not hit you.
 TASK 29-00-00-796-001
 2.  Hydraulic System External Leak Check____________________________________
 A. General
 (1)  
The chart of permitted external leakage (Table 601) gives the maximum external leakage rates for different parts. You must make a decision on the total leakage you will permit from all of the parts.

 (2)  
It is possible for leakage from a static seal to be because of a crack in its housing. This type of a leak can increase with increased pressure.

 B. References
 (1)  AMM 29-15-00/201, Hydraulic Systems A, B, and Standby
 C. Access
 (1)  Location Zones
 101/102 Control Cabin
 200 Lower Half of the Fuselage
 300 Left Wing
 400 Right Wing
 500 Left Nacelle
 600 Right Nacelle
 700 Empennage

 D. Procedure
 S 016-002
 (1)  
Get access to the part that has a leak.

 (2)  
Clean hydraulic fluid from the part.

 (3)  
Supply hydraulic power (AMM 29-15-00/201).

 S 796-005

 (4)  
Do these steps to look for leakage, then compare it to the permitted value shown in Table 601.

 S 166-003
 S 866-004
 (a)  If it is possible, move the part through approximately three full cycles.
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737-300/400/500MAINTENANCE MANUAL
 (b) Measure the leakage rate of the part.
 1)  For dynamic seals, measure the leakage rate with the part moving and stopped, if it is possible.
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737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | HYDRAULIC SYSTEM PERMITTED EXTERNAL LEAKAGE CHART | | TABLE 601 | ................................................................................ | | | MAXIMUM LEAKAGE | | PART | NORMAL LEAKAGE *[1] | FOR DISPATCH *[1] | ................................................................................ |1. Tube Connections |No leakage you can see |No leakage you can see | | *[2] | | | ................................................................................ |2. Static Seals *[3] |1 drop in 10 minutes |The operator makes the | | | |decision | ................................................................................ |3. Dynamic Seals *[4] | | | | | | | | A. Engine-Driven |30 drops in 1 minute |60 drops in 1 minute | | Pump | | | | | | | | B. Electric Motor | | | | Driven Pumps | | | | | | | | (1) ABEX |10 drops in 1 minute |20 drops in 1 minute | | | | | | (2) Vickers |20 drops in 1 minute |30 drops in 1 minute | | | | | | (3) Sundstrand |20 drops in 1 minute |30 drops in 1 minute | | | | | | (4) NY Airbrake |10 drops in 1 minute |20 drops in 1 minute | | | |Correct at the first | | | |time possible | | | | | | C. Power Transfer |10 drops in 1 minute |20 drops in 1 minute | | Unit | | | | | | | | D. Other dynamic |1 drop in 10 minutes, |30 drops in 1 minute | | seals when |no repair is necessary |Correst at the first time| | stopped, at any | |possible | | pressure *[5] | | | | | | |
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