What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N892PH a SK-92 helcopter departed Galveston at 0651 for and IFR flight to AC857 with 17 passengers and 3 crew members. At approximately 0745 the crew transmitted a call to phi communicatons center and a mayday call o houston center that they had lost hydraulic pressure to the #2 system and were making an emergency desent to a platform EB110. It was discovered that the #2 heat exchanger failed due a rupture caused by over-pressurization. Inspection determined the quick disconnect coupling associated with the #2 hdraulic pump return line quick isconnect was approximately 1/2 turn from beng completely seated. Sikorsky aircraft determined the orfice of the quick disconnect coupling could possibly be restricted by 28% at 1/2 turnfrom the seated position which could lead to an over-pressurization situation.
As the FAA filed it
N892PH A SK-92 HELCOPTER DEPARTED GALVESTON AT 0651 FOR AND IFR FLIGHT TO AC857 WITH 17 PASSENGERS AND 3 CREW MEMBERS. AT APPROXIMATELY 0745 THE CREW TRANSMITTED A CALL TO PHI COMMUNICATONS CENTER AND A MAYDAY CALL O HOUSTON CENTER THAT THEY HAD LOST HYDRAULIC PRESSURE TO THE #2 SYSTEM AND WERE MAKING AN EMERGENCY DESENT TO A PLATFORM EB110. IT WAS DISCOVERED THAT THE #2 HEAT EXCHANGER FAILED DUE A RUPTURE CAUSED BY OVER-PRESSURIZATION. INSPECTION DETERMINED THE QUICK DISCONNECT COUPLING ASSOCIATED WITH THE #2 HDRAULIC PUMP RETURN LINE QUICK ISCONNECT WAS APPROXIMATELY 1/2 TURN FROM BENG COMPLETELY SEATED. SIKORSKY AIRCRAFT DETERMINED THE ORFICE OF THE QUICK DISCONNECT COUPLING COULD POSSIBLY BE RESTRICTED BY 28% AT 1/2 TURNFROM THE SEATED POSITION WHICH COULD LEAD TO AN OVER-PRESSURIZATION SITUATION.