Hydraulic System Flashcards
What Should The 3 HYD Gauges Read Before Start
0 , 0 , 1250 ± 50
What Should The 3 HYD Gauges Read After Start
3000 , 0 , 3000
Until 70% Checks Then 3000 , 3000 , 3000
How Is HYD 1 And HYD 2 Powered
Separate Engine Driven Pumps Through The Accessory Gear Box
What Does HYD 1 Provide
Flight Controls, General Services
(Flaps, Slats, Speed Brakes, Landing Gear, NWS, Wheel Brakes, Hook, LBAR)
What PSI Do You Lose General Services
The Priority Valve Closes at 1,500 ± 100 PSI
It Will Re-Open If You Go Back Above
When Does The HYD Pressure Relief Valve Open
3,600 PSI
When Does The HYD Caution Illuminate
1,660 ± 110 PSI
Extinguishes when Above 2,000 PSI
What Does HYD 2 Provide
Flight Controls Only
When Will The RAT Deploy And When Will It Reset
Deploys At 1,500 ± 100
Re-Sets When The N2 Is Above 45% And HYD 2 Is Above 1,800 PSI
What Are Indications Of A Good RAT Deployment
RAT Caution Light Illuminated, HYD 2 Fluctuating Between 2,500 - 3,000 PSI
Warning: Sustained high-frequency, high amplitude control inputs during flight with
- RAT only hydraulic pressure could result in loss of aircraft control. Ejection outside the safe ejection*
- envelope may occur if control is lost during a landing attempt.*
Do You Need To Emergency Extend The Gear For A HYD 2 Fail
No
HYD 2 Is Flight Controls Only
Should You Attempt A HYD 2 Reset If The RAT Deploys
You Have 1 Attempt To Reset HYD 2 If The RAT Caution Is Illuminated And HYD 2 Is above 1,800 PSI
Why Do We Reset HYD 2 During The 70% Checks
To Reduce Engine Loading On Startup
What Are The Preflight Numbers For The HYD Accumulators
1,100 ± 50 PSI
What Do The HYD Accumulators Do
Provide Smooth Operation To The System During Periods Of High Demand
