Landing Gear Flashcards
Type of landing gear?
fully-retractable, single-wheel, tricycle type
How is the LG system powered, by what, and how is it sequenced?
hydraulically, by the right hyd sys, sequenced by hyd selector valves
How is the LG system controlled, by what?
electronically, by 19 (double channel) proximity-sensor electronic unit (PSEU)
How many doors on each MLG, what are they, and which is attached to the gear itself?
3, fwd rear and mid
mid attached to gear itself
How many doors does the NLG have, what are they, where are they hinged?
3, 1 fwd 2 aft
all fuselage hinged
The emergency hydraulic system is fully _____
independent
Where is the EMERG LDG GEAR handle located?
left console in FCP
How do the legs downlock mechanisms operate?
via gravity
Will the doors close when emerg LG are operated and what indication will this give?
no, red light in handle remains on
When will the emergency accumulator be recharged automatically?
when A/C is on the ground
for a total time of 90 sec from WoW to WoW in flight
THE EMERG LDG GEAR HANDLE SHALL NOT BE _______________________ AFTER ACTUATION
RETURNED TO ITS INITIAL POSITION
What are the three LG-position indicator lights controlled by?
the FCCs
Where can you see the gear indications?
control surface display and the FCS format of the MFD
The red warning light in the handle is controlled by?
the MISCO
Red handle light illuminates when position of gear/doors s not consistent with the position of the handle or when:
- Airspeed <170 KIAS
- <10 000ft MSL
- One or both throttles <35deg PLA (power lever angle)
LDG ACC caution
low pressure in the LG emerg sys <173bar (off>175bar)
LDG caution
low pressure in the right hyd sys, normal ops not guaranteed
PSEU DEGR caution
LG retraction is not possible bc PSEU has no sufficient info to guarantee safe retraction
PSEU FAIL caution
LG extension/retraction not possible bc of PSEU failure, both PSEU channels are unavailable or NOGO
Steering system hydraulically powered by the _____ hyd sys
right
What are the 2 steering control laws that can be selected by the pilot only when NG on the ground?
- Low-gain steering +/-3deg (by default)
- High-gain steering +/-40deg
When is shimmy dumping active?
more than +/-1deg and no WoW detected
Min hyd pressure in right system for NWS?
168 bar (higher than R HYD LP warning)
When does the STEER NOT ENG special alert display?
If steering is not engaged when A/C is on the ground below 70kts and at least one engine throttle is >75% NH
When does the STEER HIGH special alert display?
If steering is High-gain when A/C is on the ground and at least one engine throttle is >75% NH
STHI NWS mode shall be selected <____kts gs to retain directional control in case of ______.
50, tire burst
NWS caution
pressure in R HYD sys drops to 100 bar (even though the sys min op pressure is 168 bar)
Below what pressure in the R HYD sys/volume in the right reservoir (at/below) is the brake sys powered by L HYD sys?
175 bar, 2.5L
L HYD SYS SUPPLY FOR NORM BRAKING IS ACTIVATED BY THE BRAKE CONTROL UNIT (BCU) ONLY IF _____ AND SPEED IS HIGHER THAN _____
WOW, 5KTS
How many (minimum) brake applications are guaranteed by the LG/brake emerg accumulator in case of loss of all hyd systems? Caveat?
6, no antiskid/differential braking, if the emerg circuit has already been used for LG extension
ANTI-SKID sys becomes active when wheel speed increases above ____kts and inoperative for wheel speeds below ____kts.
15, 10
IF LEFT ENGINE IS STARTED BEFORE RIGHT ENGINE, NORMAL BRAKING IS _____________ UNTIL _____________________.
NOT AVAILABLE, RIGHT ENGINE IS STARTED
BRAKES DEGR caution
operation of brake system is degraded
BRAKES FAIL caution
there is a failure in the brake computer
WITH BCU FAILURES _____________ AND ____________ ARE NOT AVAILABLE. DO NOT PRESS THE BRAKE PEDALS DURING LANDING IF __________ CAUTION IS DISPLAYED AS IT MAY CAUSE ________.
PEDAL BRAKES, ANTI-SKID
BRAKES FAIL, ASYMMETRIC BRAKING
FWD or AFT BRAKES caution
front/rear brake pedal sensor inop, pedal sensor in other cockpit controls both brakes w same pedal pressure application
L/R BRAKE T caution
brake temp >450C
BRAKE 1 caution
L HYD sys is supplying pressurized fluid to the brake sys due to R HYD sys failure
WHEELS LKD caution
lock wheel w A/C airborne, PARK & EMER. BK handle (FCP) or EMERGENCY BRAKE handle (RCP) is pulled out
