A320
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 250; Flight Crew Total 18000; Flight Crew Type 8000
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
During cruise; we got a Green Hyd Engine 1 low presure ECAM. All other systems were normal. We accomplished the procedure and then contacted dispatch and Maintenance Control. There appeared to be a discrepancy between the ECAM checklist and the AOM checklist that we referenced after accomplishing the ECAM. As I recall; the ECAM directed us to restore the PTU [Power Transfer Unit] in order to lower the landing gear. The AOM gave no such direction. Since our Green system quantity was almost zero; turning the PTU back on didn't seem to make sense. Maintenance Control agreed; and we left the PTU off for the rest of the flight. I briefed the Flight Attendents; declared an emergency and we landed in ZZZ. Because we had to gravity extend the landing gear; we had no nose wheel steering or normal brakes but backup systems worked as advertised. We did; however; have to wait for approximately 20 minutes to get towed off the runway.
When the flight crew of an A320 attempted to resolve a Green Hyd System 1 low pressure ECAM; they discovered a discrepancy between the ECAM Checklist and the more complete procedure in their Flight Manual as far as utilizing the PTU to extend the landing gear. They declared an emergency; landed safely and was towed to a gate after a 30 minute delay.