-
flight controls in the LH wing,
-
flight control in the RH wing,
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flight controls in the tail section.
Measurement of internal leakage is done with a ground hydraulic supply and a
flowmeter.
The LMS manifold also makes it possible to isolate parts of the system for
maintenance.
The main system is connected with the PTU through the PTU manifold 3013GM.
The PTU manifold also has a connection to the flap system. The PTU
connections are:
- one inlet/outlet from/to the PTU,
- one inlet from the HP manifold,
- one outlet to the HP manifold,
- one outlet to the RH motor of the flap power control unit.
A solenoid valve 3012GL installed on the PTU manifold controls (together
with the equivalent solenoid valve of the Green hydraulic system ) the flow
of fluid to/from the PTU. A single pushbutton switch 1802GL in the flight
compartment controls the operation of the two solenoid valves. When the
pushbutton switch is operated, the two solenoid valves are energized and the
supply of fluid to/from the PTU is stopped.
R
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
The supply to most of the consumers goes through the HP and Leakage Measurement System (LMS) manifolds. Thus it is possible to isolate some consumers to measure the internal leakage of parts of the system. The supply to the alternate and parking brake systems goes from the HP manifold through the brake parking brake systems goes from the HP manifold through the brake manifold.
The HP manifold has ports which connect it to the other parts of the system as system as follows:
-a system pressure inlet from the pumps and ground supply,
-two outlets to the LMS manifold,
- one outlet to the PTU manifold,
- one inlet from the PTU manifold,
- one connection to the system accumulator/cargo doors/brake manifold.
A solenoid valve on the HP manifold controls the flow of fluid to the LMS manifold. The solenoid valve is usually operated from the flight compartment but it also has an automatic function. This function is related to the operation of the cargo doors. When the cargo doors are set to open or close (and the Yellow electric pump starts), the solenoid valve is automatically closed. This stops the supply of fluid to the flight controls. Thus there is no danger of movement of flight controls because of operation of the cargo doors.
The system pressure inlet to the HP manifold has a filter 3048GM with a filtration rating of 15 microns. A check valve is installed on the manifold. A sampling valve 3187GM makes it possible to take samples of fluid from the system for analysis. You can take the sample when the system is at full pressure.
A pressure relief valve (PRV) 3063GM is installed on the HP manifold to protect the system against overpressure. The PRV opens when the pressure is greater than or equal to 237 bar (3436 psi) and closes at 220 bar (3190 psi). Two pressure switches 3151GN, 10CE-3 and a pressure transducer 3065GN are also installed on the HP manifold to monitor the pressure in the system (Ref. 29-32-00).
The system accumulator 3070GM has direct hydraulic connections to the HP and brake manifolds and to the cargo door selector valve. The accumulator keeps the pressure in the system free of small changes. It also makes a supply of fluid available to replace any temporary shortage. This can occur if there is a sudden large demand and the pump has not had time to respond. The accumulator is pre-charged with nitrogen at 1885 psi (130 bar) and holds
0.18 l (0.0475 USgal) of the useable fluid when it is full. A gas charging valve 3071GM and a pressure gage 3072GM are installed on the accumulator.
The LMS manifold 3146GM makes it possible to measure the internal leakage of groups of consumers. The HP supply is divided into three separate outputs, one to each of the following:
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