Hydraulics

Question 1

Minimum dispatch hydraulic fluid quantity levels are:

• No. 1 system- 3.0 US gallons (11.34 litres); No. 2 system- 1.5 US gallons (5.67 litres).
• No. 1 system- 3.0 US quarts (2.83 litres); No. 2 system- 1.5 US quarts (1.41 litres).
• No. 1 system- 1.5 US quarts (1.41 litres); No. 2 system- 3.0 US quarts (2.83 litres).
• No. 1 system- 1.5 US gallons (5.67 litres); No. 2 system- 3.0 US gallons (11.34 litres).

Answer 1

• No. 1 system- 1.5 US quarts (1.41 litres); No. 2 system- 3.0 US quarts (2.83 litres).

Question 2

The standby hydraulic pumps:

• Are gear-type, constant-volume pumps.
• Provide backup pressure for the No. 1 and No. 2 systems.
• Operate continuously.
• Operate only for alternate landing gear extension.

Answer 2

• Provide backup pressure for the No. 1 and No. 2 systems.

Question 3

The purpose of the PTU is to:
-Retract the gear in the event of a #1 engine failure.
-Retract the gear in the event of a #2 engine failure.
-To power the #2 hydraulic system in the event of fluid loss from the #2
system.
-Transfer hydraulic fluid from #1 hydraulic system to #2 hydraulic system in the event of a fluid loss.

Answer 3

• Retract the gear in the event of a #2 engine failure.

Question 4

The subsystems actuated by the No. 1 hydraulic system are:
- Landing gear, nosewheel steering, outboard roll spoilers, and upper rudder actuator.
- Flaps, brakes and antiskid, inboard roll spoilers, lower rudder actuator, and the power transfer unit.
- Flaps, landing gear, brakes and antiskid, and ground spoilers.
- Power transfer unit, alternate gear extension, and outboard and inboard
roll spoilers.

Answer 4

• Flaps, brakes and antiskid, inboard roll spoilers, lower rudder actuator, and the power transfer unit.

Question 5

Illumination of a STBY HYD PUMP HOT caution light indicates:
- Fluid over temperature in the standby system.
- Over temperature of the windings in the electric motor driving the standby
pump.
- The engine driven pump is overheating
- The standby pump is hot.

Answer 5

• Over temperature of the windings in the electric motor driving the standby
  pump.

Question 6

The main system reservoirs are pressurized by:

• Cabin pressure
• A spring in the reservoir
• Engine bleed air
• System pressure applied to a differential piston

Answer 6

• System pressure applied to a differential piston

Question 7

The ENG HYD PUMP caution light illuminates when:

• EDP output pressure drops below 2,750 psi.
• EDP output pressure drops below 2,000 psi
• EDP output pressure drops below 3,000 psi.
• The power transfer unit is activated.

Answer 7

• EDP output pressure drops below 2,000 psi

Question 8

The main source of pressure for the No. 1 and No. 2 hydraulic systems is:

• Electrically driven standby pumps.
• Battery powered pump.
• Engine-driven pumps.
• The power transfer unit.

Answer 8

• Engine-driven pumps.

Question 9

The number of hydraulic systems on the Dash 8 aircraft is:

• Three
• Four
• One
• Two

Answer 9

• Three