Narrative:

On departure just after takeoff we received a hydraulic pressure low cass message. We lowered the landing gear anticipating a hydraulic low level light. The hydraulic volume low light came on just after the gear was lowered. We completed the check list and contacted ATC for an alternate airport due to the short length of the departure runway (5;000 ft). Departure informed us that tower could see something 'streaming' from the aircraft after takeoff and recommended ZZZ which has 12;000 ft of runway. We declared an emergency and were vectored there. We then briefed a landing using emergency breaking. We were able to exit the runway and brought the aircraft to a stop. Upon inspecting the aircraft I could see that the number 4 tire had 'locked' and blown. There was extensive hydraulic fluid all over the nose wheel compartment; leaking from the belly; and all the way down the belly of the aircraft. I then called the acp on duty and informed him that we needed a recovery; where we had diverted to; and what had happened. I then took photos and contacted maintenance. (I forwarded the photos to maintenance) the FBO was very near; so I had the aircraft towed to the ramp. (The other 3 tires appeared to me to be fine) company arranged for the passenger to be taken by ground to a recovery aircraft. I completed the maintenance write ups on the tire and the hydraulic leak. I then called the acp to insure there was no other action needed by him.

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Original NASA ASRS Text

Title: CE680 flight crew experiences a main hydraulic system failure shortly after takeoff. The landing gear is quickly lowered before all pressure is lost and the flight diverts to a nearby airport. An outboard main gear tire locked up during roll out and deflated.

Narrative: On departure just after takeoff we received a Hydraulic Pressure Low CASS message. We lowered the landing gear anticipating a Hydraulic Low Level light. The Hydraulic Volume Low light came on just after the gear was lowered. We completed the check list and contacted ATC for an alternate airport due to the short length of the departure runway (5;000 FT). Departure informed us that Tower could see something 'streaming' from the aircraft after takeoff and recommended ZZZ which has 12;000 FT of runway. We declared an emergency and were vectored there. We then briefed a landing using emergency breaking. We were able to exit the runway and brought the aircraft to a stop. Upon inspecting the aircraft I could see that the Number 4 tire had 'locked' and blown. There was extensive hydraulic fluid all over the nose wheel compartment; leaking from the belly; and all the way down the belly of the aircraft. I then called the ACP on duty and informed him that we needed a recovery; where we had diverted to; and what had happened. I then took photos and contacted Maintenance. (I forwarded the photos to Maintenance) The FBO was very near; so I had the aircraft towed to the ramp. (The other 3 tires appeared to me to be fine) Company arranged for the passenger to be taken by ground to a recovery aircraft. I completed the maintenance write ups on the tire and the hydraulic leak. I then called the ACP to insure there was no other action needed by him.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.