POSITION AND WARNING SYSTEM Flashcards
The purpose of antiskid generators is to
measure wheel rotational speed and any speed changes
In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid
control valve which
relieves the hydraulic pressure on the brake
An antiskid system is
an electro hydraulic system
Antiskid braking systems are generally armed by
a switch in the cockpit
A typical takeoff warning indication system, in addition to throttle setting, monitors the position of
which of the following?
elevators, speed brake, flaps and stabilizer trim
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
a thrust lever
(1) An airspeed indicator measures the differential between pitot and static air pressures surrounding
the aircraft at any moment of flight.
(2) An airspeed indicator measures the differential between pitot and cabin air pressures at any moment
of flight.
Regarding the above statements,
only no. 1 is true
The angle-of-attack detector operates from differential pressure when the airstream
is not parallel to the true angle of attack of the aircraft
(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,
both no. 1 and no. 2 are true
In an antiskid system, wheel skid is detected by
an electrical sensor
Which of the following functions does a skid control system perform?
1. Normal skid control.
2. Normal braking.
3. Fail safe protection.
4. Locked wheel skid control.
5. Touchdown protection.
6. Takeoff protection.
1,3,4,5
In the air with the antiskid armed, current cannot flow to the antiskid control box because the landing
gear
squat switch is open
At what point in the landing operation does normal skid control perform its function?
when wheel rotation deceleration indicates an impending skid
(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,
both no. 1 and no. 2 are true
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
trim position
The pneumatic (reed) type stall warning system installed in some light aircraft is activated by
negative air pressure
Stall warning systems are generally designed to begin warning the pilot when a stall
is imminent
(Refer to Figure 19.) What is the indication of the red landing gear position light under the following conditions?
Aircraft on jacks.
Landing gear in transit.
Warning horn sounding.
extinguished
(Refer to Figure 19). Which repair should be made if the gear switch was placed in UP position and the gear does not retract?
replace electrical wire no. 12
Which of the following conditions is most likely to cause the landing gear warning signal to sound?
landing gear not locked down and throttle retarded
(Refer to Figure 20.) What will illuminate the amber indicator light?
closing the nose, left and right wheel gear full retract switches
(Refer to Figure 20.) What is the minimum circumstance that will cause the landing gear warning horn to indicate an unsafe condition?
any gear not down and locked , and one throttle retarded
Where is the landing gear safety switch usually located?
on the main gear shock strut
What safety device is actuated by the compression and extension of a landing gear strut?
ground safety switch
Which repair would require a landing gear retraction test?
gear downlock micro-switch
Landing gear warning systems usually provide which of the following indications?
red light for unsafe gear, green light for gear down, no, light for gear up
In most modern hydraulically actuated landing gear systems, the order of gear and fairing door operation is controlled by
sequence valves
What landing gear warning device(s) is/are incorporated on retractable landing gear aircraft?
a horn or other aural device and a red warning light
When a landing gear safety switch on a main gear strut closes at liftoff, which system is deactivated?
antiskid system
The rotor in an autosyn remote indicating system uses
an electro magnet
The basic difference between an autosyn and a magnesyn indicating system is the
rotor
The rotor in a magnesyn remote indicating system uses
a permanent magnet
Microswitches are used primarily as limit switches to
control electrical units automatically
Which of the following are some uses for a dc selsyn system?
1. Indicates position of retractable landing gear.
2. Indicates the angle of incidence of an aircraft.
3. Indicates the altitude of an aircraft.
4. Indicates cowl flaps or oil cooler door position.
5. Indicates fuel quantity.
6. Indicates the rate of climb of an aircraft.
7. Indicates position of wing flaps.
1,4,5,7
(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,
both no. 1 and no. 2 are true
