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