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 When the Yellow electric pump starts because of operation of the cargo doors, movement of the flight controls is prevented. Electrical power is supplied to the two solenoid valves of the Green and Yellow systems and the solenoid valve of the Yellow-leakage measurement system. Thus no hydraulic power is supplied to the Green or Yellow system.
 The two solenoid valves keep the PTU either armed or off. The solenoid valve of the Green system is connected to the Green PTU manifold. The solenoid valve of the Yellow system is connected to the Yellow PTU manifold. The two solenoid valves operate at the same time. The PTU switch on the overhead panel 40VU controls the solenoid valves.
 There is no transfer of power when the isolation coupling is disconnected.
 The PTU switch is installed in the overhead panel 40VU. All other components are installed in the main landing-gear compartment.

 **ON A/C ALL
 PTU Performance
 -------------------------------------------------------------------------------I MOTOR INLET I PUMP OUTLET I PUMP
 FLOW DIRECTION I FLOW I FLOW I PRESSURE -------------------------------------------------------------------------------YELLOW TO GREEN I 119 l/min (31.44 I 95 l/min (25.10 I 206 bar
 I USgal/min) I USgal/min) I (2987 psi) I (max.) I (max.) I between 20 I I I and 80 l/min I I I (5.28 and 21.13 I I I USgal/min)
 -------------------------------------------------------------------------------
GREEN TO YELLOW  I 76 l/min (20.08 I 55 l/min (14.53 I 206 bar
 I USgal/min) I USgal/min) I (2987 psi)
 I (max.) I (max.) I between 13
 I I I and 55 l/min
 I I I (3.43 and 14.53
 I I I USgal/min)

 -------------------------------------------------------------------------------
4. Power Supply
____________
 **ON A/C 001-049, 051-058, 101-101,
 (Ref. Fig. 003)
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 003A)

 Power Supply
 Figure 003

R 1EFF : 001-049, 051-058, 101-101, 1 29-23-00Page 9/10 1 1 May 01/05 1 1 1CES
1

 INTENTIONALLY BLANK

R 1 1

29-23-00Page 11
1 1 May 01/99 1 1 1CES 1

 Power Supply
 Figure 003A (SHEET 1)

R 1EFF : 059-099, 102-149, 151-199, 201-299, 1 29-23-00Page 12 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 Power Supply
 Figure 003A (SHEET 2)

R 1EFF : 059-099, 102-149, 151-199, 201-299, 1 29-23-00Page 13 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 The power transfer system gets electrical power from the DC System of the aircraft. The service bus 602PP supplies 28 V DC to the solenoid valves through the PTU switch.
 5. Component Description_____________________
 A. PTU 1088GM (Ref. Fig. 004) The PTU is made up of a variable displacement unit coupled to a fixed displacement unit. The variable displacement unit is connected to the yellow hydraulic system. The fixed displacement unit is connected to the green hydraulic system. Displacement of the variable displacement unit is varied to maintain the required running and breakdown pressure differentials between systems. Displacement of the variable unit is controlled by means of a control which senses the system delta pressure.
 The variable displacement unit is at maximum displacement during the power transfer from the Yellow to the Green system. Then it is at minimum displacement during the power transfer from the Green to the Yellow system.
 The variable displacement unit includes a hydraulic servo valve and a variable cam. The servo valve gets input from the pressure differential, which starts the PTU. It controls the displacement of the variable cam which in turn gives the quantity of stroke. During PTU operation, the servovalve controls the pressure differential.
 There are three hydraulic connections on the fixed displacement unit and three on the variable displacement unit. The connections are:
 -high pressure,
 -low pressure,
 -case drain.
 The seal drain connection on the PTU is a standard hydraulic union. The high pressure and case drain connections are also standard hydraulic unions. The low pressure connections are self-sealing quick-release couplings.
 **ON A/C 001-049, 051-058, 101-101,
 B. Solenoid Valves 1012GL, 3012GL
 (Ref. Fig. 005)

 1EFF : ALL 1 29-23-00Page 14 1 1 Aug 01/05R 1 1 1CES 1

 Power Transfer Unit (PTU) Figure 004 
R 1EFF : 1 1 1CES  ALL  1 111 29-23-00 Page 15 Aug 01/05

 

 Solenoid Valve Figure 005 
R 1EFF : 1 1 1CES  001-049, 051-058, 101-101,  1 111 29-23-00 Page 16 Aug 01/05
　
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