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63 Cards in this Set
- Front
- Back
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Normal brake system powered by?
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Hyd B
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Describe from feet to brakes on...
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-Depress Brake Pedal
-Rotates cable system -opens normal brake metering valve -pressure thru antiskid valves -brakes on |
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What can happen if you step on the brakes in flight
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High amplitude airframe vibration w/ rudder pedal oscillations (hyd chatter btwn metering vlvs and antiskid vlvs). Fun!
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Alternate brake system powered by?
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Hyd A
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How does it switch from B to A?
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When B press is low, an alternate brake selector valve opens to supply sys A pressure to alt. brake system
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What is not available with autobrakes?
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-locked wheel protection
-touchdown protection -autobrakes (antiskid is available) |
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When is antiskid deactivated?
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Below approx 7 knots taxi speed.
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Describe locked wheel protection.
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Compares inboard to inboard and outboard to outboard. If paired wheel drops below 40% of mate, slower wheel gets release brake signal. Disarmed below 18 knots for taxi turns.
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Describe touchdown protection.
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Prevents brake app before touchdown and spinup. Sends release signal to antiskid valve when air/ground safety sensor is in air.
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Alternate antiskid?
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Only two antiskid valves, one for each pair of brakes on each gear. Disabled
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What are the functions of the brake accumulator?
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-dampens press fluxes
-ensures instantaneous flow of fluid to brakes -stores hyd fluid under pressure |
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If you lose system B pressure, how is accumulator protected?
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One way check valves and if B is lost, system A closes accumulator isolation valve.
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If you lose both A and B, what happens with the accumulator?
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The isolation valve held closed by A pressure, opens, and fluid is available to the normal brake lines. About 6 apps.
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How should brakes be applied on accumulator only pressure?
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Steady pressure, no pumping or modulating.
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The accumulator uses normal brake lines, what does this mean?
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All protections w/ normal antiskid are available. You can also set the parking brake.
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Since normal antiskid is available on accumulator brakes, can you autobrake too?
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No, autobrake uses B pressure upstream of the accumulator check valves and is not available on accumulator only braking.
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What conditions must be met to arm the autobrake system?
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-air mode
-ANTISKID control switch ON |
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When does the autobrake system self-check? What happens if the self test fails?
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When a deceleration rate is selected. AUTO BRAKE DISARM light above the AUTO BRAKE select switch.
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Ways to disarm autobrake system (4):
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-manual brake pressure for 3 seconds or more
-speed brake lever to DOWN detent manually -Advancing one or both throttles -switch to off (other decel rates does not disarm) |
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Of the four ways to disarm autobrakes, which two provide for gradual release of brake pressure?
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manual brake application or manually moving speed brake lever
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4 conditions to arm RTO on autobrakes:
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-on ground
-ANTISKID control switch ON and antiskid operational -WSS<60 knots -both throttles at idle |
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Describe 3 parts of takeoff and RTO autobrakes reaction to them.
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WSS<60kts: system is not yet armed
WSS 60-90kts: IAS could be higher due to HW, AUTO BRAKE DISARM light illuminates, autobraking will not occur. WSS>90kts: brakes auto on when throttles are retarded to idle |
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Is RTO a deceleration rate?
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NO. Full 3000 psi will be applied to brakes regardless of thrust reverser and speed brake usage. No off ramp time either.
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Disarming RTO vs. deceleration rates?
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2 seconds brake application for RTO, 3 for decel rates, all methods otherwise same.
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If takeoff is continued instead of rejected, what happens to RTO?
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RTO mode is auto disarmed upon right strut extension, BUT AUTO BRAKE DISARM light does not come on.
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What happens if you land with RTO still selected?
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It is disarmed, no light comes on, no autobraking occurs, and then the AUTO BRAKE DISARM light comes on 2 minutes after landing.
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How reset autobrake system?
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Switch to OFF, then back on again.
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Is parking brake light on a sign it is working?
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No, it merely signals linkage position.
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Name systems that can operate parking brake.
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B-Normal
A-Alternate Accumulator |
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Give a brief description of the parking brake operation.
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Closes a shutoff valve in the hyd B return line, blocking the return flow from the antiskid valves.
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Sensors for gear?
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Main gear: gear down-lock sensor
Nose gear: gear down and gear lock sensors |
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What things are sensed by the red gear lights?
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-down/lock sensors
-throttle (idle) sensors -gear uplock sensors -landing gear lever position sensors |
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When do the red gear lights come on?
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-lever not down and gear not up and locked
-gear not down and locked and lever not down -gear not down and locked and either throttle is near idle |
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Where are the landing gear viewports?
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Nose: in cockpit just fwd of the door
Mains: left of the aisle, three windows aft of overwing exit. Yellow tab in carpet left of the emergency escape path lighting. |
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Gear horn warning with different flap conditions, and is it silenceable?
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Flaps 1-10: 1/2 throttles near idle, yes
Flaps 15: 1/2 throttles near idle, yes if one throttle is advanced Flaps>15: horn on regardless of throttle posn, no |
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If you lose engine 1 on takeoff (Hyd A) how do you retract the gear?
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LGTU (triggered via N2) uses hyd B.
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What if you just lose Hyd A?
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LGTU not triggered b/c elec pump still outputs 3000psi, however volume is not enough to raise gear.
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what happens to the LGTU if no. 1 N2 tach generator fails?
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LGTU is inoperative. Can be recognized by the failure of the no. 1 engine N2 failure or failure of No. 1 engine cutout.
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When is manual gear extension necessary?
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Hyd A fails or all of LG do not extend using normal means.
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What is the design force to manually release gear? Is this what it will take?
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45 lbs, but it could take a lot more.
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Describe operation of the solenoid lock.
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If a/c is in ground mode, solenoid lock prevents raising of landing gear handle.
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How can you tell the difference between solenoid lock failure and ground shift failure?
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Flaps up before gear, horn comes on...
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Primary Hyd for NWS?
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Hyd A
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When is NWS available?
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Hyd A Power and Nose gear strut compressed.
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NWS side to side?
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Pedals 7, handle 78 degrees either way
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In order to have rudder pedal steering?
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AC and DC electrical power and hydraulic power.
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In order to have NWS from the handle?
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Hyd power only.
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How is NWS input transmitted?
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Cables to a steering metering valve. 3000psi to actuators.
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Alternate NWS?
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Some airplanes, NOSE WHEEL STEERING to ALT provides sys B hyd to NWS actuators through the LGTU
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How do you avoid losing hyd B (alt NWS) in event leak is downstream of LGTU?
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A sensor closes the LGTU transfer valve. NWS n/a.
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NWS steering bypass pin does what?
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Its in the depressurization valve for pushback and towing. You can start #1 without risk of injury or damage. Remove prior to taxi.
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What can cause ANTISKID INOP light? (3)
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-system faul
-power lost to inboard and outboard a/s -ANTISKID control switch is OFF (light disarmed w/gear lever up) |
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What happens if ANTISKID control switch is turned off?
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-ANTISKID INOP light illumminats
-SPEED BRAKE DO NOT ARM light if s/b lever moved to ARMED or aft of ARMED |
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AUTOBRAKE DISARM light (7)
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-RTO selected and 2 second bit in prog
-Failed bit w/ decel or RTO selected -autobrake malfunction -Pilot manually disarmed system (3 ways) -RTO btwn 60-90 kts and no autobraking will occur -Landing w/RTO selected -ANTISKID control switch is off |
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What is max brake pressure?
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3500 psi
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When you pull the landing gear manual extension handles, where must the gear handle be?
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Gear handle must be in OFF position.
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What is the difference between nose and main gear manual extension handle distance?
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Nose: 8 inches
Mains: 18 inches |
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How do you light the visual inspection windows for the nose and main gear?
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WHEEL WELL light switch on the forward overhead panel.
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What if the parking brake is set, but system B pressure is low? What if it is 1000psi?
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If it is merely low, you can pressurize B for a moment, you don't have to reset parking brake. If it is 1000, it is at precharge and brake is not considered set.
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Why does the main gear have to caster 3 degrees?
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Because there are no rudder inputs to the autopilot.
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When is the locked wheel protection disabled and why?
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Below 18 knots so you can make tight turns.
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Where do the three green landing gear lights receive their power from?
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Landing gear lock and position sensors. They come on when the sensors are triggered.
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What is final, red or green?
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Green, if there are red too, it is most likely due to a malfunction in the gear handle sensor.
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