Hydraulics

Question 1

Question: What items will not work at all with failure of Left Hydraulic system?

Answer 1

Answer: Refer to Checklist System Impacts

• Spoilers (Mid-board): Not available
• Thrust Reverser (left): Not available

Question 2

Question: The Left Hydraulic pump failed 2 hour after takeoff. Is there anything you must do?

Answer 2

Answer: Limit speed to 285 KCAS / 0.90M

Answer: Refer to Checklist Failure LESS than 1 hour after takeoff –Airplane ……………………………………………………………………………….. Land within 1.5 hours Altitude ………………………………………………………………………………… 27,000 feet maximum Failure MORE than 1 hour after takeoff –Airplane ………………………………………………………………………………….. Land within 9 hours

Question 3

Question: What would cause the Auxiliary Hydraulic pump to operate automatically?

Answer 3

Answer: Closing the MED without left hydraulic pressure available

Answer: Inboard brake accumulator pressure < 1500 PSI weight on wheels

Answer: With the AUX Pump ARMED: Disagreement between flap handle and flaps or gear handle and gear and less than 1500 PSI in left hydraulic system.

Question 4

Question: Will the aux hydraulic pump retract the landing gear?

Answer 4

Answer: Yes, but very slowly.

Question 5

Question: While in FLIGHT, the checklist instructs the pilot to turn ON the Auxiliary Hydraulic Pump. How long will it operate?

Answer 5

Answer: 2 Minutes while in-flight

Question 6

Question: Is there any limitation associated with a hydraulic failure?

Answer 6

Answer: AFM, Limitations Airspeed Limitations:

If ANY primary flight control surface or spoiler panel is failed, caused by either a component malfunction(s) or a hydraulic system failure, do not exceed 285 KCAS / 0.90M.

Question 7

Question: What is the purpose of the PTU?

Answer 7

Answer: Provides operational redundancy to the LEFT system.

Question 8

Question: What are the requirements for PTU operation once it’s been ARMED?

Answer 8

Left system pressure < 2400 psi; Fluid in the left system; Right system not hot.

Question 9

Question: If the Aux pump shuts OFF because of the 2 minute limitation. How do you get it back ON?

Answer 9

Answer: Cycle the Aux pump switch to OFF then back to ON.

Question 10

Question: What effect does loss of ONE hydraulic system have on the aircraft?

Answer 10

Left system:

Left Thrust Reverser Inoperative; Mid Spoiler panels Inoperative.

Right system:

Right Thrust Reverser Inoperative; Inboard Spoiler panels Inoperative; PTU Inoperative; Right brake accumulator.

Question 11

Question: If an engine fails in flight and the engine is windmilling (spinning) will the windmilling engine produce HYDRAULIC pressure as long as engine is failed

Answer 11

No

Question 12

Question: What is the purpose of the hydraulic heat exchangers and where are they located?

Answer 12

Answer: They are located in the Hoppers and allow the cooler fuel to cool the hotter hydraulic fluid.