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panel can be used. Pressing the DN LCK REL button mechanically withdraws the solenoid
lock, permitting UP selection of the landing gear lever.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
LANDING GEAR (CONT'D)
Normal Gear Extension
Figure 15−10−4
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
LANDING GEAR (CONT'D)
Gear Extension
During gear extension, the NLG extends rearward and the MLG extends outward. Maximum
extension speed is 197 KIAS (0.6 M).
When the LDG GEAR handle is selected to the DN position, the PSEU commands and monitors
the following events:
• NLG door selector valve is energized, to open the forward NLG doors.
• NLG and MLG selector valves are energized, to direct hydraulic fluid to release the
respective uplocks and extend the landing gear.
• NLG and MLG downlocks are mechanically engaged, to secure the landing gear in the
extended position.
• NLG door selector valve is energized, to close the forward NLG doors.
• The hydraulic selector valves remain energized, to provide full-time hydraulic pressure
on the NLG and MLG actuators, and to hold the NLG door closed
NOTE
The maximum airspeed at which the airplane may be flown with the
landing gear extended and locked is 250 KIAS (0.7 M).
NOTE
If the landing gear position does not match the LDG GEAR handle
position within 28 seconds, the amber gear in transition indication is
replaced by the red gear not safe indication, accompanied by the
GEAR DISAGREE warning EICAS message and “GEAR DISAGREE”
aural warning.
Alternate Landing Gear Extension
Should a failure occur with the landing gear control circuitry or hydraulic system 3, landing gear
extension is still possible, by pulling the red landing gear manual release handle.
Pulling the handle mechanically releases the nose gear forward door uplock and the three
landing gear uplocks. In addition, the handle operates dump valves that remove hydraulic
pressure, allowing the gear to free-fall.
The nose doors open as the landing gear free-falls under its own weight. The nose gear extends
rearward, and is assisted to the down-and-locked position by two downlock assist springs
(which lock the drag brace), and by the airflow pushing against the gear. The nose door will
remain open.
The MLG free-falls to the extended position. The main landing gear are assisted to the
down-and-locked position by the MLG downlock assist actuators, which are powered by
hydraulic system 2. The MLG downlock assist actuators force the MLG actuators to full
extension, which engages the internal downlock mechanisms.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
LANDING GEAR (CONT'D)
A ball-detent retains the landing gear manual release handle in the extended position. To reset
the handle, the button in the center of the handle must be depressed, and the handle lowered to
the stowed position.
NOTE
To ensure priority to the primary flight controls, a
spring-loaded-closed priority valve cuts off hydraulic system 3
pressure to the landing gear selector valves, if system 3 pressure
drops below 2,100 psi. Alternate landing gear extension will be
required in this case.
NOTE
When normal hydraulic system 3 pressure is available, stowing the
manual gear release handle returns the landing gear selector valves
to normal operation.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
LANDING GEAR (CONT'D)
Alternate Gear Extension
Figure 15−10−5
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
LANDING GEAR (CONT'D)
Landing Gear Horn
When the aircraft is weight off wheels for more than two minutes, with any gear not down and
locked, the landing gear horn will sound according to the logic in the following tables:
Gear Horn Logic with “Precision Plus”
RADAR
ALTITUDE
RATE OF
DESCENT
AIRSPEED FLAPS THROTTLES HORN
CAPABLE
OF MUTING
>1,000 ft Any Any Any Any position Off N/A
Radalt inop Any <185 kt 0 Both idle On No
Radalt inop Any <185 kt 0 One idle On Yes
Radalt inop Any <163 kt <30 One idle On Yes
　
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