DQ-128

Question 1

• In flight with the Backup Hydraulic Pump switch OFF, which caution/advisories will cause the pump to operate?
• On the ground?

Answer 1

In flight:

• # 1 HYD PUMP, #1 TAIL RTR SERVO, #1 RSVR LOW
• # 2 HYD PUMP
• APU ACCUM LOW

(Three ones, One two and the APU)

On the ground:

• APU ACCUM LOW

Question 2

Which hydraulic pumps have a depressurizing valve and what is its purpose?

Answer 2

• An internal depressurizing valve in the backup pump module reduces the output pressure of the pump upon startup of the electric motor.
• This valve unloads the electric motor by reducing torque requirement at low RPM. After about 0.5 second when main generator is operating, or 4 seconds when operating from APU generator or external power, the valve is closed and 3000 psi pressure is supplied to the hydraulic system.

Question 3

Is it acceptable for the hydraulic fluid level to be in the over fill zone?

Answer 3

After flight, fluid in hydraulic systems will be hot. Piston movement of up to 3⁄8 inch into the blue (black on some pumps) (overfill) zone is acceptable.

Question 4

Dentify the following Master Warning Panel caution and warnings and what causes each to appear?

Answer 4

A. MASTER CAUTION PRESS TO RESET

• Indicates a caution on the caution panel has been actuated by failed system.

B. #1 ENG OUT

• No. 1 engine Ng SPEED is below 55%.

C. #2 ENG OUT

• No. 2 engine Ng SPEED is below 55%.

D. FIRE

• Indicates a fire detector has actuated a fire warning circuit.

E. LOW ROTOR RPM

• Rotor speed is below about 96% RPM R.

Question 5

Given these departure conditions, what is the minimum single engine airspeed (without stores) and how is it calculated?

• Temp
 40 degrees
• PA
 2000’
• ETF’s
 1.0 / .92
• Aircraft Gross Weight 20000 lbs.

Answer 5

Use Cruise chart (7A-55) and low ETF:

48 KIAS

Question 6

In the context of Risk Management, “Develop Controls” normally fall into one of what three categories?

Answer 6

 Educational (Awareness) controls.

• Effective educational controls are implemented through individual and collective training that ensures performance to standard.

 Physical controls.

• Barriers and guards or signs to warn individuals, units, or organizations that a hazard exists.

 Hazard elimination controls.

• Positive actions to prevent exposure through substantial reduction or the total elimination of the hazard. Three methods:
  • Engineering.
  • Administrative.
  • Personal protective equipment (PPE).