Flap Carriages Figure 029
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Flap Carriages
Figure 029A
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R Flap Carriages
R Figure 029B
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1 1
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Flap and Track Fairing Operating Mechanism
Attached to the flap bottom surface, immediately outboard of each track position, is a flap link arm. Bolted to the drive lever, on its related actuator, is the forward end of each link arm. At tracks 1 and 4 are links arms made of machined aluminium. At tracks 2 and 3 are link arms made of machined titanium. The link arms transmit the movement from the rotary actuators to the flap surface.
Attached to the flap bottom surface, at tracks 2, 3 and 4, is an arm which operates the track fairing. Attached to the operating arm is a linkage which operates the moveable track fairing during flap extension and retraction.
L. Not Applicable
**ON A/C 301-399,
L. Flap and Track Fairing Operating Mechanism
(Ref. Fig. 005A, 006)
Attached to the flap bottom surface, immediately outboard of each track position, is a flap link arm. Bolted to the drive lever, on its related actuator, is the forward end of each link arm. At tracks 1 and 4 are link arms made of machined aluminium. At tracks 2 and 3 are link arms made of machined titanium. The link arms transmit the movement from the rotary actuators to the flap surface.
Attached to the flap bottom surface, at tracks 2, 3 and 4, is an arm which operates the track fairing. Attached to the operating arm is a linkage which operates the moveable track fairing during flap extension and retraction.
Fairings attached to the flap and tab bottom surfaces cover the hinges at the 1A, 1B, 3A, 3B and 3C positions.
M. Inboard and Outboard Tab Operating Mechanism
The inboard tab is attached to the rear spar of the flap at hinge 1A,
hinge 1B and at flap Track 2.
The outboard tab is attached to the rear spar of the flap at the tracks 3
and 4 and at the hinges 3A, 3B and 3C.
When the flaps move, the tabs are operated by a linkage connected from:
-
the shroud box assembly to the hinge 1A tab attachment bracket
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the roller carriages of the tracks 2, 3 and 4 to the tab attachment brackets.
**ON A/C ALL
7. Operation/Control and Indicating
________________________________
(Ref. Fig. 003, 011, 013, 014)
A. Hydraulic Actuation
The SFCC 1 controls the valve block of the GREEN hydraulic system and the related motor on the PCU. The SFCC 2 controls the valve block of the YELLOW hydraulic system and the related motor on the PCU.
NOTE : The operation of the valve block of the GREEN hydraulic system and
____ the related motor is given. The operation of the valve block of the YELLOW hydraulic system and the related motor is the same.
NOTE : The operation of the valve block is almost the same for the
____ extension and retraction of the flaps. The extend and retract solenoid valves control the direction of the movement of the hydraulic motor.
(1) Flap Extension (Retraction)
(a)
When the SFCC 1 receives a command to extend (retract) the flaps, it energizes the extend (retract) solenoid valve of the PCU valve block.
(b)
The energized extend (retract) solenoid valve lets hydraulic fluid flow to one end of the spool of the PCU control valve (referred to as the valve spool).
(c)
The valve spool moves from the neutral position and lets hydraulic fluid flow to:
-
the POB solenoid valve
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the extend (retract) side of the motor.
(d) When the valve spool reaches the "pressure on point", a signal from the LVDT causes the SFCC 1 to energize the POB solenoid valve:
-
the POB releases
-
the motor starts to turn
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-the flaps extend (retract).
(e) As the flaps get near to the commanded position:
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the FPPU sends a signal to the SFCC 1 when the flaps are 6.69 deg. (FPPU) away from the commanded position
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the SFCC 1 energizes the retract (extend) solenoid valve (all three valves are now energized)
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the opposite end of the valve spool receives fluid pressure
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