Hydraulics
Joined: Jul 2007
Posts: 350
Likes: 0
From: ***
not a fixed amount, depends on flight time, height and so on, like fuel
It gets serviced, refilled to a limit and so on. It is not dependent on the variables above and in no way like fuel...
Nic
Joined: Jan 2006
Posts: 454
Likes: 3
From: Georgia, USA
Max fill for an A319.
Green 14.5L, Yellow 12.5L & Blue 6.5L.
Green 14.5L, Yellow 12.5L & Blue 6.5L.
It only reflects the amount in the resevoir, the system contains alot more.
100 liters (26 gallons) in the Green system.
75 liters (20 gallons) in the Yellow system.
60 liters (16 gallons) in the Blue system.
Joined: May 2001
Posts: 10,804
Likes: 1
Thanks for that I did wonder about hyd fluid as a consumable.
Thanks for the data. Do Boeing types use more of the stuff for a similar sized aircraft?
And for the orginal OP on my type the hyd temp warning comes on at 90 deg C.
And large earnthmovers/diggers the operators have been known to cook chickens on the hyd tanks.
Thanks for the data. Do Boeing types use more of the stuff for a similar sized aircraft?
And for the orginal OP on my type the hyd temp warning comes on at 90 deg C.
And large earnthmovers/diggers the operators have been known to cook chickens on the hyd tanks.
Joined: Mar 2000
Posts: 8,571
Likes: 3
From: Arizona USA
Complete bull!
It gets serviced, refilled to a limit and so on. It is not dependent on the variables above and in no way like fuel...
It gets serviced, refilled to a limit and so on. It is not dependent on the variables above and in no way like fuel...
As for total quantity, seem to remember 48 USGallons total hydraulic fluid capacity on the L1011.
Joined: May 2005
Posts: 187
Likes: 0
From: Standing at P37
From the 747 Maintenance Manual;
CAUTION:
DURING OPERATIONS INVOLVING HYDRAULIC SYSTEMS PRESSURIZATION, RELATED INSTRUMENTS AND INDICATING LIGHTS IN THE FLIGHT COMPARTMENT SHOULD BE CLOSELY MONITORED TO ASSURE SATISFACTORY OPERATION OF SYSTEM. IF HYDRAULIC FLUID OVERHEAT CONDITION OCCURS, SYSTEM OPERATION SHOULD BE DISCONTINUED.
DO NOT OPERATE TRAILING EDGE FLAPS MORE THAN TWO CYCLES IN A 15 MINUTE PERIOD. SYSTEM LOADING CONDITIONS CAN OVERHEAT HYDRAULIC FLUID.
Check for a minimum of 300 gallons (2000 pounds; 900 kilograms) of fuel in each No. 1 and 4 main fuel tanks, and 805 gallons (5400 pounds, 2450 kilograms) in each No. 2 and 3 main fuel tanks.
NOTE: If the applicable tank has the minimum amount of fuel, there is no time limit on the operation of the hydraulic pump. If there is less fuel than the minimum amount, the hydraulic pump operation is limited to 15 minutes.
CAUTION: TO PREVENT HYDRAULIC FLUID OVERHEAT, DO NOT OPERATE PUMPS AFTER OVERHEAT LIGHT COMES ON OR LONGER THAN 15 MINUTES WITHOUT MINIMUM QUANTITIES OF FUEL IN TANKS. ALLOW 20-MINUTE COOLING PERIOD AFTER 15-MINUTE OPERATION OR AFTER OVERHEAT LIGHT GOES OUT. WHEN AMBIENT TEMPERATURE EXCEEDS 100¡F, OPEN NACELLE STRUT FAIRING DOORS. EXTREME TEMPERATURES AND LOAD CONDITIONS CAN OVERHEAT HYDRAULIC FLUID.
The above outlines operations in the Maintenance environment and it would be extremely unlikely to encounter a hydraulic overheat and near to impossible in a "Flight" condition. But like anything in aviation, "It's possible"
.
CAUTION:
DURING OPERATIONS INVOLVING HYDRAULIC SYSTEMS PRESSURIZATION, RELATED INSTRUMENTS AND INDICATING LIGHTS IN THE FLIGHT COMPARTMENT SHOULD BE CLOSELY MONITORED TO ASSURE SATISFACTORY OPERATION OF SYSTEM. IF HYDRAULIC FLUID OVERHEAT CONDITION OCCURS, SYSTEM OPERATION SHOULD BE DISCONTINUED.
DO NOT OPERATE TRAILING EDGE FLAPS MORE THAN TWO CYCLES IN A 15 MINUTE PERIOD. SYSTEM LOADING CONDITIONS CAN OVERHEAT HYDRAULIC FLUID.
Check for a minimum of 300 gallons (2000 pounds; 900 kilograms) of fuel in each No. 1 and 4 main fuel tanks, and 805 gallons (5400 pounds, 2450 kilograms) in each No. 2 and 3 main fuel tanks.
NOTE: If the applicable tank has the minimum amount of fuel, there is no time limit on the operation of the hydraulic pump. If there is less fuel than the minimum amount, the hydraulic pump operation is limited to 15 minutes.
CAUTION: TO PREVENT HYDRAULIC FLUID OVERHEAT, DO NOT OPERATE PUMPS AFTER OVERHEAT LIGHT COMES ON OR LONGER THAN 15 MINUTES WITHOUT MINIMUM QUANTITIES OF FUEL IN TANKS. ALLOW 20-MINUTE COOLING PERIOD AFTER 15-MINUTE OPERATION OR AFTER OVERHEAT LIGHT GOES OUT. WHEN AMBIENT TEMPERATURE EXCEEDS 100¡F, OPEN NACELLE STRUT FAIRING DOORS. EXTREME TEMPERATURES AND LOAD CONDITIONS CAN OVERHEAT HYDRAULIC FLUID.
The above outlines operations in the Maintenance environment and it would be extremely unlikely to encounter a hydraulic overheat and near to impossible in a "Flight" condition. But like anything in aviation, "It's possible"
.
Joined: Jun 2006
Posts: 94
Likes: 0
From: Canada
some aircraft have heat exchangers in the fuel tanks requiring a minimum amount of fuel for cooling
Joined: Jan 2006
Posts: 454
Likes: 3
From: Georgia, USA
Not all of the hydraulic fluid passes through the heat exchangers. Only the portion of the hydraulic fluid that circulates through the pumps for cooling and lubrication is passed through the heat exchangers.
Joined: Jun 2006
Posts: 94
Likes: 0
From: Canada
Doesn't all the hydraulic fluid pass through the pump sooner or later?
Last edited by Jetdoc; 23rd June 2010 at 18:58.
Joined: May 2001
Posts: 10,804
Likes: 1
It was that drain return which caused the incident I had with the base plate seperating from the pump body pulling the studs from the casting. A none return valve packed in and became a valve in the closed position q a whore of a lot of noise a big bang and tons of smoke. Our ginger was in the back as well when it blew. It was the most emotional and expressive I have ever seen him with a tech problem.
