(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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(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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~.............................................................................. | 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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