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BOEING 767 SYSTEMS REVIEW
Page 1
LANDING GEAR
1. NORMAL OPERATION AND INDICATION
Landing gear is powered by the CENTER hydraulic system. Landing gear lever is prevented from being moved to UP by the Lever lock which is : - controlled by main gear tilt sensors - released when BOTH main gear TILT after T/O LOCK OVRD switch may be pushed as the gear will tilt by itself during retraction. MAIN gear locking provided by a SIDE brace and a DRAG brace : - if DRAG brace fails to lock, try by increasing the speed (max 270 kt) - if SIDE brace fails to lock, try by reducing the speed GEAR and DOORS lights ON during gear retraction and extension The tailskid is linked to the gear operation except in ALTERNATE. No speed nor drag limitation if the tailskid remain extended.
2. NORMAL EXTENSION
When the MAIN gear & NOSE gear have extended, doors close.
3. ALTERNATE EXTENSION
ALTERNATE extension should be used when : - Center hydraulics is U/S - any gear does not extend Alternate extension = Electric motor releases the UPLOCK of the NOSE gear and LOCKING DOORS mechanism for the MAIN gears Main gear DOORS remain open, but there is adequate ground clearance. With NOSE gear down and locked, the NOSE GEAR DOOR indication is inhibited.
4. AIR/GROUND LOGIC
MAIN gear tilt sensors on each MAIN gear = air/ground sensing system. Nose gear compressed sensing system provides logic to relays controlling stall warning and portions of the caution and warning system. On some aircraft (on ground only), an EICAS advisory message for AIR/GND SYS or NOSE A/G SYS indicates that some portion of the sensing system has failed in the air position. Affected equipment and systems will not operate normally.
Copyright Smartcockpit.com Ludovic ANDRE / version 00
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BOEING 767 SYSTEMS REVIEW
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5. NOSE WHEEL STEERING
Center hydraulic or the reserve brakes and steering system provide power for the Nose wheel steering 180 turn requires a minimum of 44.5 m pavement width. NOSE gear deflection is 6 by rudder and 65 by tiller. Wing tip radius is greater than tail radius.
6. FAULTS
D O O R S G E A R
(amber) : Either MAIN gear or NOSE gear door open when NOSE gear not extended. (AOM 18.10.01)
(amber)
Gear disagrees with lever position : - Any MAIN gear door open with gear lever in OFF or UP position - Gear lever not properly seated in detent.
TAIL SKID
(amber) : Tailskid disagrees with lever position.
NOSE
(green) : Valid also for LEFT & RIGHT / Respective gear down & locked.
Copyright Smartcockpit.com Ludovic ANDRE / version 00
Smartcockpit.com
BOEING 767 SYSTEMS REVIEW
Page 3
LANDING GEAR SCHEMATIC LANDING GEAR SCHEMATIC
Copyright Smartcockpit.com Ludovic ANDRE / version 00
