Questions - Position and Warning Systems

Fill in the Blanks

1. Instruments are installed for two purposes: to display ___________ conditions and to notify of ___________ conditions.

2. If a locked wheel is not quickly released, the tire is likely to ___________, causing aircraft ___________ or loss of ___________.

3. The braking effectiveness of a skidding tire is nearly ___________.

4. To achieve maximum braking, the wheel should just start to ___________ but not ___________.

5. To achieve maximum braking and to stop the aircraft in the shortest possible distance, the pilot depresses the brake pedals ___________.

6. Anti-skid systems typically deactivate automatically at about _______ MPH.

7. An auto-brake system automatically applies the brakes when the system senses ___________ on the

8. The three principal components of an anti-skid system are the:
a. ___________
b. ___________
c. ___________

9. An AC wheel speed sensor produces a variable frequency ___________ while a DC wheel speed sensor produces a variable ___________.

10. The control valve maintains an output ___________, which is proportional to the signal from ___________ the control unit.

11. A(n) ________-________ detector prevents the pilot from landing with the brakes applied.

12. On wet or icy runways, the locked-wheel detector prevents a wheel from ___________.

13. Anti-skid systems include ___________ circuits and controls to verify proper operation.

14. The most logical place to begin troubleshooting an anti-skid system is with the ___________.

15. A stall occurs when an airplane reaches a critical ___________ of ___________.

True or False

1. The typical AC wheel speed sensor has not a stator mounted in the wheel axle. True/False

2. Anti-skid control valves are fast-acting, electrically controlled hydraulic valves that respond to the input from the anti-skid control unit. True/False

3. Anti-skid control valves are typically located in the main wheel. True/False

4. It is essential that the brakes are applied when the aircraft contacts the runway upon landing. True/False

5. An inoperative anti-skid system cannot be shut off without affecting normal brake operation. True/False

6. Anti-skid components are normally repaired in the field. True/False

7. The anti-skid system is included in the pilot’s pre-landing checklist. True/False

8. Many Autosyn® systems use dual indicators. True/False

9. The stator of a Magnesyn® system is a toroidal coil: a coil wound around a box-shaped iron core. True/False

10. The ground proximity warning system (GPWS) provides warnings and /or alert to the flight crew when windshear condition uncounted. True/False

Knowledge Application Questions

1. What unit in an anti-skid system generates the anti-skid warning signal?

2. How is a pilot alerted that an anti-skid system has automatically returned to a manual brake system?

3. What is the significance of an anti-skid warning?

4. By what usual means does the stall warning system in a small aircraft alert the pilot of an impending stall?

5. What devices are used to provide warnings for a retractable landing gear system?

6. How can a pilot determine that the landing gear is down and locked?

7. Name at least two conditions that would activate a takeoff configuration warning system in a jet transport aircraft.

8. What landing gear positions must be indicated by regulations?

9. Under what conditions will a landing gear aural warning sound?

10. How does a takeoff configuration warning differ from a landing gear warning?

Multiple Choices Questions

1. The purpose of antiskid generators is to
a. measure wheel rotational speed and any speed changes.
b. monitor hydraulic pressure applied to brakes.
c. indicate when a tire skid occurs.

2. In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid control valve which
a. relieves the hydraulic pressure on the brake.
b. acts as a bypass for the debooster cylinders.
c. equalizes the hydraulic pressure in adjacent brakes.

3. An antiskid system is
a. a hydraulic system.
b. an electrical system.
c. an electrohydraulic system.

4. Antiskid braking systems are generally armed by
a. the rotation of the wheels above a certain speed.
b. a centrifugal switch.
c. a switch in the cockpit.

5. A typical takeoff warning indication system, in addition to throttle setting, monitors the position of which of the following?
a. Ailerons, elevators, speed brake, and steerable fuselage landing gear.
b. Elevators, speed brake, flaps, and stabilizer trim.
c. Aerodynamically actuated slats, elevators, flaps, and speed brake.

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
a. a thrust lever.
b. an 80 knot airspeed sensor.
c. an ignition system switch not set for takeoff.

7. (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,
a. both No. 1 and No. 2 are true.
b. only No. 2 is true.
c. only No. 1 is true.

8. The angle of attack detector operates from differential pressure when the airstream
a. is parallel to the longitudinal axis of the aircraft.
b. is not parallel to the true angle of attack of the aircraft.
c. is parallel to the angle of attack of the aircraft.

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,
a. only No. 1 is true.
b. No. 1 and No. 2 are true.
c. only No. 2 is true.

10. In an antiskid system, wheel skid is detected by
a. a sudden rise in brake pressure.
b. a discriminator.
c. an electrical sensor.

11. 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.

a. 1,2,5,6
b. 1,3,4,5
c. 1,2,3,4

12. In the air with the antiskid armed, current cannot flow to the antiskid control box because
a. landing gear squat switch is open.
b. landing gear down and lock switch is open.
c. landing gear antiskid valves are open.

13. At what point in the landing operation does normal skid control perform its function?
a. When wheel rotation deceleration indicates an impending skid.
b. Anytime the wheel is rotating.
c. When wheel rotation indicates hydroplaning condition.

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,
a. only No. 1 is true.
b. both No. 1 and No. 2 are true.
c. only No. 2 is true.

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
a. speed break position.
b. flap/slat position.
c. trim position.

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