In the good 'olde'days,SOP's stipulated :with a "poss'rate of climb" one could call for the 'eng fire drill'DC8/747. thence the builders(boeing) felt that too much was being done-!too low down! ergo the Industry advocated,that it was safer,to get some height prior to pushing and pulling levers,with the required 'other pilot'confirmation.The'alt'to initiate the drills vary,from 400,-800,