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NOTE
1) The landing gear manual release handle will ratchet from the
stow to the extend position upon selection. The handle will lock
in a given detent position if released during extension only.
2) When the handle is selected to stow following a full extension,
the handle will not ratchet (lock) if released. When the PUSH
FULLY TO STOW button is pushed, care should be taken to
guide the handle (under spring tension) to its fully stowed
position.
GX_14_021
LG Manual Release Handle
• To manually extend the landing gear:
Pull the handle through all detent positions
until the handle locks in the full extended
position.
• To reset the manual release system:
Keep a slight pressure on the handle to
prevent the handle from rapidly returning to
stow while pushing in the “PUSH FULLY TO
STOW” button.
LG PULL
PUSH
FULLY TO
STOW
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-22 For Training Purposes Only
Sept 04
Manual Release Sequence
The following is the sequence of events which occur during manual landing gear
extension:
• Landing gear manual release handle PULL to full extension
• System No. 3 shutoff valve blocks pressure to all hydraulically operated gear door
uplocks and the landing gear uplocks
• Dump valve opens, transferring hydraulic system No. 3 pressure from all gear and
door actuators to return
• The main gear doors and uplocks are mechanically released
• Both main landing gear extension/retraction actuators are pressurized by hydraulic
system No. 2 (through the action of the system No. 2 alternate power valve) to
assist main gear downlock
Within approximately one to two seconds following full extension of the manual
release handle:
• The nose landing gear door and gear uplocks are mechanically released
• The nose landing gear is permitted to free-fall and is assisted by springs within the
drag brace to achieve downlock
GEAR
UP UP
GX_14_022
NOSE GEAR CAUTION
GEAR
GX_14_023
ALL GEAR IN TRANSIT
For Training Purposes Only
Sept 04
14-23
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
NOTE
With all gear indicating down and locked, the left and right main
and nose gear doors, and nose door remain open. L-R MAIN
GEAR DOOR and NOSE DOOR caution message will be
displayed.
• Upon successful completion of manual gear extension, the manual release handle
is to remain fully extended
DN DN
GEAR
DN
DOWN AND LOCKED
GX_14_020
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
14-24 For Training Purposes Only
Sept 04
Landing Gear Manual Release Schematic
The following schematic is an overview of the manual gear lowering system.
GX_14_024
GEAR
UPLOCK
RELEASE
DOOR
UPLOCK
RELEASE
MAIN AND NOSE
DUMP VALVE
SYSTEM NO. 3
SHUTOFF
MAIN GEAR
EXT/RETRACTION
ACTUATORS
SYSTEM NO. 2
ALTERNATE
POWER VALVE
DOOR
UPLOCK
RELEASE
GEAR
UPLOCK
RELEASE
DOOR
UPLOCK
RELEASE
NOSE GEAR
UPLOCK
RELEASE
LEFT MAIN
GEAR ASSEMBLY
RIGHT MAIN
GEAR ASSEMBLY
NOSE GEAR
ASSEMBLY
LG PULL
PUSH
FULLY TO
STOW
For Training Purposes Only
Sept 04
14-25
P I LOT T R A I N I N G GU I D E
LANDING GEAR AND BRAKES
NOSEWHEEL STEERING SYSTEM
The steering control system is electrically controlled and hydraulically actuated.
The nosewheel steering system is armed from a switch on the landing gear control
panel in the flight compartment. It is activated once the WOW signal and nose landing
gear down-and-locked signals are present. Steering commands are input to the
Steering Control Unit (SCU) through the pilot’s hand wheel (full authority ± 75°) and/
or the rudder pedals (limited authority ± 7.5°).
NOTE
If handwheel and rudder pedal input commands are received at
the same time, the SCU will sum these inputs to a maximum of
± 75°.
Nosewheel position feedback is provided to the SCU by two transducers mounted on
the steering actuators. The SCU controls an electrohydraulic servovalve in the
hydraulic manifold (mounted on the nose gear assembly), which ports hydraulic
pressure to each of the steering actuators as required. The steering actuators (mounted
on the main fitting of the nose gear) operate in a push/pull manner to rotate the
steering collar. Mechanical torque links are provided to transmit the movement of the
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