-
If the leakage rate is less than 4 drops per minute, no further action is necessary
-
If the leakage rate is between 4 and 14 drops per minute, replace the yaw damper servo-actuator(s) before the next 600 flight hours (Ref. TASK 27-26-51-000-001) and (Ref. TASK 27-26-51-400-001)
-
If the leakage rate is between 15 and 30 drops per minute, replace the yaw damper servo-actuator(s) before the next 100 flight hours (Ref. TASK 27-26-51-000-001) and (Ref. TASK 27-26-51-400-001)
-
If the leakage rate is more than 30 drops per minute, replace the yaw damper servo-actuator(s) immediately (Ref. TASK 27-26-51-000-001) and (Ref. TASK 27-26-51-400-001).
NOTE : 5. A leak rate of 10 drops per minute is permitted, if the
____
temperature is lower than -40 deg.C (-40.00 deg.F).
(3) System leak rate limits
(a)
The total leak rate of the Green system must not be more than 50 drops/min.
(b)
The total leak rate of the Yellow system must not be more than 50 drops/min.
(c)
The total leak rate of the Blue system must not be more than 50 drops/min.
(d)
If the temperature at the next airport is lower than -20 deg.C (-
4.00 deg.F) fill the applicable reservoir to the maximum level shown on the reservoir:
-14.5 l (3.8304 USgal) for the Green system
-12.5 l (3.3021 USgal) for the Yellow system
-6.5 l (1.7171 USgal) for the Blue system.
R 1EFF : 001-049, 051-061, 101-105, 201-203, 1 29-00-00Page 607 1 1 May 01/05 1 1 1CES 1
(e) If the total leak rate of a hydraulic system is more than the system leak rate, aircraft dispatch is permitted if:
1 The reservoir of the applicable system is full:
_
-14.5 l (3.8304 USgal) for the Green system
-12.5 l (3.3021 USgal) for the Yellow system
-6.5 l (1.7171 USgal) for the Blue system.
2 The total leak rate for the applicable system is not more than
_ the dispatch limits given below:
-
for the Green system, the total leak rate must not be more than 100 drops/min.
-
for the Yellow system, the total leak rate must not be more than 100 drops/min.
-
for the Blue system, the total leak rate must not be more than 100 drops/min.
(f)
Make sure that the drops of the hydraulic fluid do not fall on electrical equipment.
(g)
If an aircraft has component leaks or system leaks which are more than the normal operation limit or systen leak rate, aircraft dispatch is permitted if:
-component leak rate is lower than the dispatch limit
- one hydraulic system only has component leaks more than the maximum limit
-for one system, the quantity of the leaks is less than the dispatch limit authorized for the system
-the hydraulic reservoirs are full
-you do the above checks again, before each flight.
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
Subtask 29-00-00-790-050-A
B. External Leak Test of the Component
(1)
Operate the component.
(2)
Do an inspection of the component for external leaks. If you find leaks, you must compare the quantity of the leaks with the values given in the table below:
-------------------------------------------------------------------------------| Equipment | Normal Operation Limit | Dispatch Limit to | | | | Avoid Delay | |---------------------------|------------------------|------------------------| |1. HYDRAULIC PUMP | | | | Engine Driven Pump (EDP) | | | | Electric Motor Pump (EMP)| | | | Ram Air Turbine (RAT) | | | | Power Transfer Unit (PTU)| | | |---------------------------|------------------------|------------------------| | Static Seals | None | 2 drops in 10 min. | |---------------------------|------------------------|------------------------| | Static Casing | 1 drop in 10 min. | 1 drop/min. | |---------------------------|------------------------|------------------------| | Shaft Seal | 2 drops/min. | 8 drops/min. | | (system pressurized) | | | |---------------------------|------------------------|------------------------| | Shaft Seal | EDP: 5 drops/min. | EDP: 60 drops/min. | | (in operation) | EMP: 5 drops/min. | EMP: 30 drops/min. | | | RAT: 1 drop/min. | RAT: 1 drop/min. | | | PTU: 5 drops/min. | PTU: 30 drops/min. | |---------------------------|------------------------|------------------------| |2. SERVOCONTROL | | | | Elevator | | | | Aileron | | | | Rudder | | | | Spoiler | | | |---------------------------|------------------------|------------------------| | Yaw Damper | (see NOTE 4.) | (see NOTE 4.) | |---------------------------|------------------------|------------------------| | Static Seal | None | 2 drops in 10 min. | | (system pressurized) | | | |---------------------------|------------------------|------------------------| | Dynamic Seal | 1 drop in 10 min. | Elevator: 6 drops in | | (system pressurized) | | 10 min. (see NOTE 1.) | | | | Aileron: 6 drops in | | | | 10 min. (see NOTE 1.) | | | | Rudder : 30 drops/min. | | | | Spoiler: 30 drops/min. | |---------------------------|------------------------|------------------------| | Dynamic Seal | 1 drop in 10 cycles | Elevator: 3 drops in | | (in operation) | | 10 cycles (see NOTE 1.)| | | | Aileron: 3 drops in | | | | 10 cycles (see NOTE 1.)| | | | Rudder: 15 drops/cycle | | | | Spoiler: 15 drops/ | | | | cycle |
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