I noticed this question here on aviation stackexchange, and I was wondering if there is a way to deduce the minimum IFR altitude (either 1000ft or 2000ft above obstacles, depending on whether or not the aircraft flies over mountainous areas) based solely on the information provided on a SID plate? Take, for example, La Guardia Five Departure (here is its textual description and here its take-off minimums).

Could someone point me in the right direction?


I understand that it is not required for a pilot to be aware of the minimum IFR altitude if he is following a SID. Perhaps I am overthinking it, but I am asking because I would like to know if, theoretically, an aircraft would have the right to climb with a climb gradient less than the standard (200 FPNM) while following a SID, if

A: There is not any other minimum climb gradient assigned

B: He is above 1000ft or 2000 ft (the aforementioned "minimum IFR altitude")

  • 1
    I'm not sure if I understand the question: if you're following an instrument procedure - or an airway - then you fly whatever altitude it requires. Or whatever ATC tells you to fly, of course. The 1000/2000 thing is a 'default' if you aren't following an explicit procedure or instruction (see 91.177). So I don't really know what the "minimum IFR altitude" would even mean to an aircraft following a SID. If you can clarify that, someone may be able to help. – Pondlife Aug 10 at 15:10
  • @Pondlife thank you for your comment. I will edit my question in order to make it clearer. – Vector Zita Aug 10 at 17:49

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