Position and Warning Systems

Question 1

An antiskid system is designed to what?

Answer 1

sense the deceleration rate of every main landing gear wheel and release then reapply pressure at a slightly lower value when a skid is detected.

Question 2

In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid control valve which…

Answer 2

relieves the hydraulic pressure on the brake.

Question 3

An antiskid system is what?

Answer 3

an electrohydraulic system.

Question 4

Antiskid braking systems are generally armed by…

Answer 4

a switch in the cockpit.

Question 5

A typical takeoff warning indication system, in addition to throttle setting, monitors the position of which of the following?

Answer 5

Elevators, speed brake, flaps, and stabilizer trim.

Question 6

The primary purpose of a takeoff warning system is to alert the crew that a monitored flight control is not properly set prior to takeoff. The system is activated by what?

Answer 6

a thrust lever.

Question 7

An airspeed indicator measures the differential between what?

Answer 7

pitot and static air pressure.

Question 8

The angle of attack detector operates from differential pressure when the airstream…

Answer 8

is not parallel to the true angle of attack of the aircraft.

Question 9

(1) When an airplane is slowed below approximately 20 mph, the antiskid system automatically deactivates to give the pilot full control of the brakes for maneuvering and parking.

(2) An antiskid system consists basically of three components; wheel speed sensors, control box, and control valves.

Regarding the above statements,

Answer 9

both 1 and true are true.

Question 10

In an antiskid system, wheel skid is detected by what?

Answer 10

An electrical sensor.

Question 11

Which of the following functions does a skid control system perform?

Answer 11

Normal skid control, fail safe protection, locked wheel skid control, touchdown protection.

Question 12

In the air with the antiskid armed, current cannot flow to the antiskid control box because landing gear…

Answer 12

squat switch is open.

Question 13

At what point in the landing operation does normal skid control perform its function?

Answer 13

when wheel rotation deceleration indicates an impending skid.

Question 14

(1) An antiskid system is designed to apply enough force to operate just below the skid point.

(2) A warning lamp lights in the cockpit when the antiskid system is turned off or if there is a system failure.

Regarding the above statements,

Answer 14

Both 1 and No. 2 are true.

Question 15

When an airplane’s primary flight control surfaces are set for a particular phase of flight, such as landing or takeoff, the corresponding control-surface indicating system will show…

Answer 15

trim position.

Question 16

The pneumatic (reed) type stall warning system installed in some light aircraft is activated by…

Answer 16

negative air pressure.

Question 17

Stall warning systems are generally designed to begin warning the pilot when a stall…

Answer 17

is imminent.

Question 18

(Refer to figure 19.) What is the indication of the red landing gear position light under the following conditions?

Answer 18

extinguished.

Question 19

(Refer to figure 19) Which repair should be made if the gear switch was placed in UP position and the gear does not retract?

Answer 19

Replace electrical wire No. 12

Question 20

Which of the following conditions is most likely to cause the landing gear warning signal to sound?

Answer 20

Landing gear not locked down and throttle retarded.

Question 21

(Refer to figure 20.) What will illuminate the amber indicator light?

Answer 21

Closing the nose, left and right wheel gear full retract switches.

Question 22

(Refer to figure 20) What is the minimum circumstance that will cause the landing gear warning horn to indicate an unsafe condition?

Answer 22

Any gear not down and locked, and one throttle retarded.

Question 23

Where is the landing gear safety switch usually located?

Answer 23

On the main gear shock strut.

Question 24

What safety device is actuated by the compression and extension of a landing gear strut?

Answer 24

Ground safety switch.

Question 25

Which repair would require a landing gear retraction test?

Answer 25

Gear downlock microswitch.

Question 26

Landing gear warning systems usually provide which of the following indications?

Answer 26

Red light for unsafe gear; green light for gear down; no light for gear up.

Question 27

In most modern hydraulically actuated landing gear systems, the order of gear and fairing door operation is controlled by what?

Answer 27

Sequence valves.

Question 28

What landing gear warning device(s) is/are incorporated on retractable landing gear aircraft?

Answer 28

A horn or other aural device and a red warning light.

Question 29

When a landing gear safety switch on a main gear strut closes at liftoff, which system is deactivated?

Answer 29

Antiskid system

Question 30

The rotor in an Autosyn remote indicating system uses what?

Answer 30

An electromagnet

Question 31

The basic difference between an autosyn and a magnesyn indicating system is the what?

Answer 31

rotor

Question 32

The rotor in a magnesyn remote indicating system uses what?

Answer 32

a permanent magnet

Question 33

Microswitches are used primarily as limit switches to what?

Answer 33

control electrical units automatically.

Question 34

Which of the following are some uses for a DC selsyn system?

Answer 34

Indicate the position of retractable landing gear, cowl flaps position, cooler door position, fuel quantity, and position of wing flaps.

Question 35

(1) A DC selsyn system is a widely used electrical method of indicating a remote mechanical movement or position.

(2) A synchro-type indicating system is an electrical system used for transmitting information from one point to another.

Regarding the above statements,

Answer 35

Both 1 and 2 are true.