I chose to depart from Innsbruck but noticed that visibility is only 400 meters. Runway 26 goes off the list immediately because of the IMC and the initial departure procedure for runway 8 states that minimum of 4.8% climb gradient is required. I started wondering, is NG (particularly interested in -800) allowed to depart in such conditions? It's obvious that I can't land here in case of an engine failure during take off and I'd have to divert to Munich or Salzburg, but can I get out of the mountains with one engine in the first place in IMC? I searched through manuals but couldn't find any information on ROC for single engine take-off operations. I understand that PMDG probably couldn't publish that information but is there any other way to calculate if you can meet minimum climb gradient requirements for certain weights?

Engine failure on takeoff is addressed separately and independently of the IFR departure procedure (.e.g. SID) climb requirement. For a complete discussion on the subject, I recommend you view a new training video located on the NBAA website:

 

http://www.nbaa.org/ops/safety/climb-performance/videos/planning-for-takeoff-obstacle-clearance.php

 

The operator is required to independently determine the takeoff weight limit with respect to one-engine-inoperative obstacle clearance.

 

With detailed obstacle information, a program like TOPCAT can produce a takeoff weight limit that ensures obstacle clearance along the SIDs lateral path, but it is based in a process other than meeting SID's climb gradinet based on single engine climb performance.

 

My guess, though, is that if the engine fails at V1 and the pilot continues the takeoff, a special engine failure procedure is used instead of the SID.

 

Hope this helps,

 

Rich Boll

Hi,

as suggested by Rich special engine out sid procedures are necessary in some airport due to particular orography. E..O. SID are published for every airport in the SID CHARTS i.e. if you look at the departures charts of Zurich airport (LSZH) you can find also engine out specific procedures (there necessary due to the sourronding Alps..very close to the airport...)

 

Best Regards and Merry Xmas!

 

Andrea Buono