Hydraulic Systems

Question 1

How many independent hydraulic systems are used on a Bell 212?
A. One
B. Two
C. Three
D. Four

Answer 1

C. Three

Question 2

How many servos are used for main rotor system control?
A. Two
B. Three
C. Four
D. Five

Answer 2

B. Three

Question 3

How are the No. 1 and No. 2 hydraulic pumps driven?
A. Electrically from the essential buses
B. Pneumatically by bleed air from the engines
C. Mechanically by the N1 section of each engine
D. Mechanically by the main transmission

Answer 3

D. Mechanically by the main transmission

Question 4

Which statement concerning the hydraulic filters is correct?
A. The return filter has a bypass, and the pressure filter does not.
B. The pressure filter has a bypass, and the return filter does not.
C. Neither the pressure nor the return filters have bypass capability.
D. Both the pressure and the return filters have bypass capability.

Answer 4

A. The return filter has a bypass, and the pressure filter does not.

Question 5

At what pressure does the pressure relief valve open?
A. 650 psi
B. 750 psi
C. 1,000 psi
D. 1,100psi

Answer 5

D. 1,100psi

Question 6

How is each electrical solenoid valve controlled?
A. By the associated HYDR SYS switch on the center pedestal
B. By a pressure switch in the valve and filter assembly
C. By the other hydraulic system’s pressure switch
D. Both A and C

Answer 6

A. By the associated HYDR SYS switch on the center pedestal

Question 7

How does a loss of electrical power affect the hydraulic system that is switched off?
A. The system comes back on.
B. There is no effect on the system.
C. The HYDRAULIC caution light illuminates.
D. The hydraulic pressure gage indicates 0 psi.

Answer 7

A. The system comes back on.

Question 8

How does loss of pressure in one hydraulic system affect the other hydraulic system?
A. There is no effect on the remaining hydraulic system.
B. The remaining system cannot be switched off.
C. The fluid return shutoff valve interconnects both systems.
D. The solenoid valves of both hydraulic systems close.

Answer 8

A. There is no effect on the remaining hydraulic system.

Question 9

What device illuminates the HYDRAULIC caution panel light?
A. The pressure switch at 650 psi
B. The solenoid valve as it opens
C. The shutoff valve at 750 psi
D. The solenoid valve as it closes

Answer 9

A. The pressure switch at 650 psi

Question 10

What is the purpose of the return fluid shutoff valve?
A. To shut off return fluid to the associated pump
B. To trap return fluid within the servo loops
C. To shut off return fluid at the solenoid valve
D. To trap return fluid within the return filter

Answer 10

B. To trap return fluid within the servo loops

Question 11

How may the pilot check if any of the hydraulic filters are clogged?
A. Check the pop-up button on the top of each filter.
B. Check the FILTER CLOGGED caution panel light.
C. Check the remote indicator in the pilot’s chin window.
D. The HYDRAULIC caution light indicates a clogged filter.

Answer 11

C. Check the remote indicator in the pilot’s chin window.

Question 12

What is the approximate hydraulic fluid operating temperature difference between the No. 1 and No. 2 systems?
A. There is no temperature difference.
B. The No. 1 system operates 88C hotter.
C. The No. 1 system operates 15C hotter.
D. The No. 2 system operates 15C hotter.

Answer 12

D. The No. 2 system operates 15C hotter.

Question 13

What is the purpose of the temperature switch?
A. T o open the return fluid shutoff valve to the cooler
B. T o open the reservoir interconnect to equalize temperatures
C. T o illuminate the HYDRAULIC caution light at 88C
D. Both A and C

Answer 13

C. T o illuminate the HYDRAULIC caution light at 88C

Question 14

Which flight control hydraulic servo is operated by only the No. 1 hydraulic system?
A. Right cyclic
B. Left cyclic
C. Collective
D. Antitorque

Answer 14

C. Collective

Question 15

When should the rotor brake be used?
A. At any NR rpm but only after engine shutdown
B. During engine starting in very high winds
C. Only at or below 40% NR after engine shutdown
D. Both B and C

Answer 15

C. Only at or below 40% NR after engine shutdown

Question 16

How should the rotor brake be applied?
A. Fully on until the rotor is almost stopped
B. Fully on until 15% NR rpm and then fully off
C. Intermittent pumping until fully stopped
D. Any of the above

Answer 16

A. Fully on until the rotor is almost stopped

Question 17

What condition illuminates the ROTOR BRAKE caution panel lights?
A. Moving the rotor brake handle out of the OFF detent
B. Rotor brake system pressure reaching 600 psi
C. Movement of the brake pads out of the retracted position
D. Loss of hydraulic pressure in the rotor brake system

Answer 17

C. Movement of the brake pads out of the retracted position

Question 18

What action should the pilot take if a ROTOR BRAKE caution panel light illuminates in flight?
A. Check that the actuating handle is in the fully off detent
B. Pull the RTR BRAKE circuit breaker.
C. Land as soon as possible if the lights remain illuminated.
D. Both A and C

Answer 18

D. Both A and C

Check that the actuating handle is in the fully off detent
Land as soon as possible if the lights remain illuminated.

Question 19

What device allows the servos of a failed hydraulic system to function without interfering with the operating servos?
A. The pressure-operated shutoff valve
B. The failed system's servo valves
C. The failed system's bypass valves
D. The servo's spring-link assemblies

Answer 19

C. The failed system’s bypass valves