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Extension/Retraction Controls and Indications
Figure 004A
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Extension/Retraction Controls and Indications
Figure 004B
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Brake Controls and Indications - Location
Figure 005
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Brake Controls and Indications - Location
Figure 005A
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Main Landing Gear and Doors
Figure 006
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Main Landing Gear and Doors
Figure 006A
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**ON A/C ALL
A. Main Landing Gear and Doors (Ref. 32-10-00)
Each MLG has a MLG leg which includes an oleo-pneumatic shock absorber. The L/G retracts into the available space of its MLG bays.
A two-piece side stay assembly holds the MLG in the extended position. A lock stay keeps the side stay assembly stable in the lock down postion.
Three doors close each MLG bay. These are:
-
a hydraulically-operated main door
-
a mechanically-operated hinged door
-
a fairing door on the MLG leg.
A door opening mechanism lets the main door be opened on the ground for access to the MLG bay.
B. Nose Landing Gear and Doors (Ref. 32-20-00)
(Ref. Fig. 007)
The nose door includes on oleo-pneumatic shock absorber and retracts forward into a bay in the fuselage. A two-piece drag strut assembly with a lock stay locks the leg in the extended position. The leg includes a hydraulically-operated steering mechanism (Ref. 32-51-00).
Four doors and a fairing close the NLG bay. These are:
-
two hydraulically-operated forward doors
-
two mechanically-operated rear doors
-a fixed fairing on the NLG leg.
A door opening mechanism lets the forward doors be opened on the ground for access to the NLG bay.
C. Extension and Retraction (Ref. 32-30-00)
The normal extension and retraction system (Ref. 32-31-00) extends and retracts:
-
the left and right MLG and doors (Ref. 32-11-00) and (Ref. 32-12-00)
-
the NLG and doors (Ref. 32-21-00) and (Ref. 32-22-00).
The system is electrically controlled and hydraulically operated.
Two independently wired electrical systems control the operation of the
hydraulic components. Each system has:
-a Landing Gear Control and Interface Unit (LGCIU)
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Nose Landing Gear and Doors Figure 007
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-proximity sensors to show the position of the L/G components.
The hydraulic circuit has actuators that extend and retract the gears and open and close the doors. The green hydraulic system (Ref. 29-11-00) supplies the hydraulic power to operate the actuators.
The system has two electro-hydraulic valves that control the operation of the actuators. One electro-hydraulic valve controls the actuators for the L/G. The other controls the actuators for the doors.
The LGCIU makes the selections of the valve assembly to retract or extend the L/G and move the doors in a given sequence.
The indicating and warning data for the L/G is given in (Ref. 32-61-00). The LGCIU also has Built-In Test Equipment (BITE) which is given in (Ref. 32-69-00).
The free fall extension system (Ref. 32-33-00) extends the MLG and NLG if the normal extension and retraction system is not available. The system includes electrical rotary-type actuators. The actuators operate mechanical linkages to open the gear and door uplocks and hydraulic valves. This lets gravity extend the gears.
D. Wheels and Brakes (Ref. 32-40-00)
The wheels are of aluminium alloy and can have a tubeless radial or bias ply tyre.
The normal braking system (Ref. 32-42-00) is used to decrease the speed of the aircraft when it moves on the ground. The Brake and Steering Control Unit (BSCU) controls the operation of normal braking. Each brake has two hydraulically operated pistons. When braking is necessary, hydraulic pressure is supplied from the Green main hydraulic system (Ref. 29-11-00). The system has two modes of operation, manual and automatic, and gives automatic anti-skid protection in each mode.
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