Widebody Transport
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 6855; Flight Crew Type 2502
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
General None Reported / Taken
Procedure
Flying [this leg] we are generally over the Terrain Critical Depressurization Procedure (TCDP) area of Greenland. The TCDP is simple; if west of W040 descend to FL140 and proceed to the west coast of Greenland; if east of W040 descend to FL140 and proceed to the east coast of Greenland.For my flight; the original route had an ETOPS Critical Point (CP) west of W040 with an ETOPS alternate east of W040. Thus the ETOPS solution conflicted with the TCDP. I can find no guidance that says that an ETOPS solution can ignore TCDP requirements; nor does it say that an ETOPS solution must comply with a TCDP; however since both are in the manuals and both address the same contingency; a decompression; it seems a reasonable inference that an ETOPS solution should comply with a TCDP. From a practical standpoint it also seems reasonable.
Air Carrier Captain reported the Terrain Critical Depressurization Procedure conflicts with the ETOPS Critical Point on a specific transatlantic route.