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 Choice Questions
1. The purpose of antiskid generators is toa. 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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ANSWERS
Fill in the Blanks
1. current, unsatisfactory
2. blow, damage, control
3. zero
4. slip, skid
5. all the way
6. 20
7. weight, wheels (main wheels)
True or False
2. blow, damage, control
3. zero
4. slip, skid
5. all the way
6. 20
7. weight, wheels (main wheels)
True or False
1. false
2. true
3. true
4. false
5. false
Knowledge Application
2. true
3. true
4. false
5. false
Knowledge Application
1. The control unit
2. By a warning light
3. The system is off or has failed
4. An audible alert and/or a warning light
5. A horn or other aural device, and a red warning light or lights
Multiple Choice
2. By a warning light
3. The system is off or has failed
4. An audible alert and/or a warning light
5. A horn or other aural device, and a red warning light or lights
Multiple Choice
1. a
Antiskid generators measure the rotational speed of the wheel and any changes in the rotational speed. A signal is generated that varies in frequency or signal strength according to the speed of the wheel.
2. a
In an antiskid brake system, the skid control valves are located downstream of the brake control valves. When the skid control generator senses an impending wheel skid, it sends a signal to the skid control box which in turn sends a signal to the skid control valve. The skid control valve takes the brake system pressure supplied to it and bypasses some of it back to the system return line. The amount of pressure the skid control valve allows to go to the brakes should not allow a wheel skid to occur.
3. c
An antiskid system makes use of electrical components, such as the skid control generator and the skid control box, as well as hydraulic components, such as the skid control valves. This combination of electrical and hydraulic components makes the antiskid an electrohydraulic system.
4. c
The pilot can turn off the operation of the antiskid system by a switch in the cockpit.
5. b
Take-off Warning Systems will monitor the take-off position of critical control surfaces and systems. These include stabilizer trim-, trailing edge flap-, leading edge device-, and speedbrake-positions
6. a
The takeoff configuration warning system is armed when the aircraft is on the ground and one or more thrust levers are advanced to the takeoff position.
7. c
Airspeed indicators are sensitive instruments which measure the difference between the pitot and static pressures.
8. b
The operation of the angle-of-attack indicating system is based on detection of differential pressure at a point where the airstream is flowing in a direction that is not parallel to the true angle of attack of the aircraft.
OTHER QUESTIONS
Antiskid generators measure the rotational speed of the wheel and any changes in the rotational speed. A signal is generated that varies in frequency or signal strength according to the speed of the wheel.
2. a
In an antiskid brake system, the skid control valves are located downstream of the brake control valves. When the skid control generator senses an impending wheel skid, it sends a signal to the skid control box which in turn sends a signal to the skid control valve. The skid control valve takes the brake system pressure supplied to it and bypasses some of it back to the system return line. The amount of pressure the skid control valve allows to go to the brakes should not allow a wheel skid to occur.
3. c
An antiskid system makes use of electrical components, such as the skid control generator and the skid control box, as well as hydraulic components, such as the skid control valves. This combination of electrical and hydraulic components makes the antiskid an electrohydraulic system.
4. c
The pilot can turn off the operation of the antiskid system by a switch in the cockpit.
5. b
Take-off Warning Systems will monitor the take-off position of critical control surfaces and systems. These include stabilizer trim-, trailing edge flap-, leading edge device-, and speedbrake-positions
6. a
The takeoff configuration warning system is armed when the aircraft is on the ground and one or more thrust levers are advanced to the takeoff position.
7. c
Airspeed indicators are sensitive instruments which measure the difference between the pitot and static pressures.
8. b
The operation of the angle-of-attack indicating system is based on detection of differential pressure at a point where the airstream is flowing in a direction that is not parallel to the true angle of attack of the aircraft.
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