Landing Gear And Hydraulics Flashcards
How many Hydraulic systems are there?
2
What is the minimum dispatch quantity for hydraulic fluid in each system?
1=1.5Quarts
2=3Quarts
What powers the main hydraulic pumps?
The RGB
What Items are powered by the Number 2 system?
LDG gear Outboard spoilers Nosewheel Steering Emerg brake Rudder actuator (upper)
What items are powered by the Number 1 hydraulic system?
Flaps Antiskid (toe brakes) Inboard spoilers Rudder actuator (lower) PTU
Loss of fluid in what system would affect landing distance the most?
No1
What are the 2 ways to turn on the STBY hydraulic pumps?
Select flap, maunually using the switch
What powers the SPU’s?
L/R VAC buses in opposite. number 2 system will auto switch to R VAC if L fails.
What is the normal pressure of the Hydraulic pumps
3000PSI
What is the normal pressure of SPU’s?
2900PSI
What could bring on ENG HYD PUMP?
loss of pressure (less than 2000PSI) or fluid. I.e. leak or pump failure
What is the main purpose of the PTU?
Assist the #2 SPU with gear retraction and to prevent the ARPS system activating
When will the PTU automatically turn on?
Eng oil pressure below 40psi (eng fail) AND gear is retracting.
Can the PTU help if the #2 system has lost all fluid?
No
What powers the Hydraulic quantity gauges?
26V FAC
With a total loss of both hydraulic systems, what hydraulic actuator will still be operating? How will you know that it is still operating?
2 STBY pressure with no main system pressure.
Upper rudder actuator (#2 system)
via ARPS
What colour is our hydraulic fluid and what is it called?
SKYDROL, purple
How can we transfer fluid between reserviours?
normally not possible but there is a procedure on the back of the Air NSN AIP
HYD FLUID HOT
fluid over 109degC, no actions
1/2 HYD PUMP
System pressure below 2000PSI. could be a leak or fluid loss.
Main pump output rate
9.5Gal/min
SPU output rate
1.5Gal/min
No. 2 SPU AUX PWR
Powered by R VAC bus (same side, is normally powered by L VAC)
What bus powers the number 2 SPU?
LVAC
when will the #2 SPU be on automatically?
Less than 2000PSI pressure in main system + WOW
1/2 SPU hot
Overheat of SPU (no auto off)
What pressure does the PTU run at
2750PSI
PTU flow rate
4.5USG/min
where is the PTU on signal sent from?
a pressure switch on the number 2 side
What failsafes/cutoffs does the system have?
T handle valve in feed line to main pump, a pressure relief valve in the line before the filter, and the alternate gear release door
What power sources does the ARPS system need to funtion?
18PSI bleed air, #2 SPU (L or R VAC bus)
What does ARPS stand for?
Alternate rudder power supply
When does the RSOV activate?
system pressure below ~30PSI (activated by 18PSI air)
How is the Landing gear controlled and operated?
Electronically controlled through the selection lever, hydraulically controlled
How can we test the LDG gear lights?
Advisory lights test
What do the Amber lights on the Gear panel indicate?
Gear doors open