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PEDESTAL
HYDRAULIC
SYSTEM
#3
TE
RN
HYDRAULIC
SYSTEM
#2
EXT AC
PUSH
CKPT CALL
PUSH
HDPH
LAMP MIC
TEST
PKG BRK
ON
BATT
ON
AVAIL
IN USE
CALL
APU
SHUT--OFF
NOSE
DOOR
OPEN
FLT/
NORM
Vol. 1 16--20--9
REV 56, Jan 31/03
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual
CSP A--013
MASTER
Landing Gear EICAS Messages <MST>
Figure 16---20---7
NOSE DOOR OPEN
Primary Page
Status Page
HORN MUTED
<0039>
<0039>
NOSE DOOR OPEN Warning (red)
Indicates that nose landing gear bay doors are
open for more than 10 seconds after gear has
locked or with airspeed greater than 250 kt.
NOSE DOOR
GEAR DISAGREE Warning (red)
Indicates that landing gear position does not
agree with landing gear selector lever position.
GEAR DISAGREE
GEAR DISAGREE
HORN MUTED
Status (white)
Indicates that landing
gear warning horn
has been manually
muted.
<0006>
<0039>
REV 56, Jan 31/03
Vol. 1 16--20--10
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual MASTER
CSP A--013
Landing Gear --- Primary Page Gear Indications <MST>
Figure 16---20---8
Primary Page
<0039>
<0006>
Landing Gear Position Indicator
UP (white) -- Indicates that respective
landing gear is in the up and locked position.
DN (green) -- Indicates that respective landing
gear is in the down and locked position.
(amber) -- Indicates that respective
landing gear is in transition.
(red) -- Indicates that respective
landing gear is not safe.
(amber dashes) -- Indicates that
respective landing gear is in
unknown position.
”Landing Gear Warning Horn”
Comes on to warn that the landing gear
are unsafe if:
Airplane is below 1,000 AGL, and
Rate of descent is 400 fpm, and
Landing gear are not down and locked.
NOTE
The gear symbols and flap position indicators
come on whenever the landing gear warning
horn is active.
<0039>
NOTE
The amber gear symbols will flash if the
landing gear warning horn is on for more
than 10 seconds.
<0039>
TOO LOW GEAR (Aural warning)
Is heard if any landing gear is not down
and locked with the radio altitude less
then 500 ft AGL and the indicated
airspeed is less than 190 knots.
Vol. 1 16--20--11
REV 56, Jan 31/03
LANDING GEAR
Nose and Main Landing Gear
Flight Crew Operating Manual
CSP A--013
MASTER
The PSEU monitors the position of the landing gears, nose landing gear doors and the
uplocks and downlocks. Landing gear position is displayed on the EICAS primary page.
The gear position information is removed from the primary page 30 seconds after the gear is
up and locked.
A. Landing Configuration Warning
The landing gear warning horn will sound if:
S 2 minutes after ground to air transition, any landing gear is not down and locked,
and
S The indicated airspeed is less than 163 knots with one or both thrust levers selected
to IDLE, or
S The indicated airspeed is less than 185 knots with the flaps at less than 5_ and one
or both thrust levers selected to IDLE.
NOTE
1. The landing gear warning horn may be muted with one thrust
lever at IDLE and the landing gear not in the down and locked
position.
2. The landing gearwarning horn cannot bemuted when the flaps
are selected to greater than 30_, or both thrust levers are set
to IDLE.
3. The landing gear warning horn is inhibited during take--off
windshear conditions.
4. The landing gear warning horn will not sound during a radio
altimeter test in flight and the horn is inhibited during take--off
windshear conditions. <0039>
B. Alternate Landing Gear Extension
Should a failure occur in the landing gear control system or in hydraulic system 3,
landing gear extension is still possible by pulling the landing gear manual release
handle.
When the handle is pulled, the nose landing gear forward door camlock and the three
landing gear uplocks are released by mechanical means. At the same time the
associated dump valves are opened to route No.3 hydraulic system pressure to return
which permits the landing gear to extend under its own weight.
The main landing gear is assisted to the down-and-locked position by the main gear
down lock assist actuators which are powered by No.2 hydraulic system. The nose
　
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