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priority valve cuts off hydraulic system 3 pressure to the
landing gear selector valves if system 3 pressure drops below
2100 psi. Alternate landing gear extension will be required in
this case.
When normal hydraulic system 3 pressure is available, stowing
the manual gear release handle returns the landing gear selector
valves to normal operation.
NOTE
NOTE
LANDING GEAR / BRAKES
15-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Alternate Gear Extension
Figure 15-5
NOSE LANDING
GEAR SELECTOR
VALVE
NLG DOORS
SELECTOR VALVE
NOSE LANDING
GEAR DUMP
VALVE
NLG DOORS
DUMP VALVE
NLG DOOR
UPLOCK
NLG DOOR
ACTUATOR
NLG
UPLOCK
NOSE LANDING
GEAR ACTUATOR
NLG
DOWNLOCK
MAIN GEAR
SELECTOR
VALVE
MAIN GEAR
DUMP VALVE
LH MAIN GEAR
ACTUATOR
LH MAIN GEAR
UPLOCK
RH MAIN GEAR
ACTUATOR
RH MAIN GEAR
UPLOCK
LH MAIN GEAR
DOWNLOCK
ASSIST
ACTUATOR
RH MAIN GEAR
DOWNLOCK
ASSIST
ACTUATOR
MAIN GEAR
DOWNLOCK
ASSIST
SELECTOR
VALVE
ACCUMULATOR ACCUMULATOR
NO. 3 HYDRAULIC
SYSTEM
NO. 2 HYDRAULIC
SYSTEM
PSEU
LANDING GEAR
MANUAL RELEASE HANDLE
LANDING GEAR CONTROL
• NLG DOWNLOCK
• NLG UPLOCK
• NLG DOOR UP
• MLG DOWNLOCK
• MLG UPLOCK
P604_15_010
M
A
N
U
A
L
R
E
L
A
G
L
E
A
S
E
N
D
I
N
G
E
A
R
PUSH
FULLY TO
STOW
LGG PULL
Legend
Commands
MUTED
OFF
TEST
MLG BAY OVHT TEST
OVHT FAIL
UP DN
LDG GEAR
DN LCK
REL
ANTI-SKID
ARMED
NOSE STEER
ARMED
HORN
OFF
Mechanical
Release
Pressurized
#3 System
Pressurized
#2 System
No Hydraulic
Pressure
LANDING GEAR / BRAKES
For Training Purposes Only
Jan 04
15-11
P I LOT T R A I N I N G GU I D E
Landing Gear Horn
The landing gear horn will sound when the aircraft is weight off wheels for more than
two minutes, any gear is not down and locked, and one of the following conditions is
fulfilled:
RADAR
ALTITUDE
RATE OF
DESCENT AIRSPEED FLAPS THROTTLES HORN CAPABLE OF
MUTING
> 1000 ft Any Any Any Any position Off N/A
Radalt inop Any < 185 kts 0 Both idle On No
Radalt inop Any < 185 kts 0 One idle On Yes
Radalt inop Any < 163 kts < 30 One idle On Yes
Radalt inop Any < 163 kts Any Both idle On No
Radalt inop Any < 163 kts > 30 Any position On No
< 1000 ft VSI inop Any Any Any position On No
< 1000 ft > 400 fpm Any Any Any position On No
< 500 ft Any Any Any Both idle On No
< 500 ft Any Any > 30 Any position On No
Gear Horn Logic with “Precision Plus”
Table 15-1
AIRSPEED FLAPS THROTTLES HORN CAPABLE OF
MUTING
> 185 kts 0 Both idle Off N/A
< 185 kts 0 Both advanced Off N/A
< 185 kts 0 One idle On Yes
< 185 kts 0 Both idle On No
> 163 kts > 0 Both idle Off N/A
< 163 kts < 30 Both advanced Off N/A
< 163 kts < 30 One idle On Yes
< 163 kts < 30 Both idle On No
< 163 kts > 30 Any position On No
Gear Horn Logic without “Precision Plus”
Table 15-2
LANDING GEAR / BRAKES
15-12 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Proximity Sensing Electronic Unit (PSEU)
Description
The proximity sensing electronic unit (PSEU) receives data from various proximity
sensors, microswitches, and cockpit controls and switches. The PSEU processes this
data to control the landing gear extension and retraction sequences, and to provide
aircraft configuration information to various systems for flight and ground operations.
Operation
Proximity sensors measure the physical relationship between two aircraft components
(sensor and target). If the components are close, the sensors or microswitches provide
a “near” signal. If the components are separated, a “far” signal is generated. The PSEU
processes this information to command landing gear and other aircraft systems’
operation.
In the case of the landing gear, the PSEU monitors the position of the landing gear,
nose doors, uplocks, downlocks and Weight On Wheels (WOW). It also electrically
　
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