Next, specify the stable approach height (SAH) below which the airplane must be within these parameters. Until recently, most airlines and corporate jet operators have used 1,000 feet above threshold elevation for instrument conditions and 500 feet when visual. However, based on the preliminary findings of this study, some operators are now specifying a stable approach is required below 1,000 feet whether on instruments or visual. It is important to set deviation criteria and stable approach heights that are realistic for your type of aircraft and flight operation. While it is obviously dangerous to specify a very low altitude as the SAH or to allow too great a deviation before requiring a callout, it is also counterproductive to set too high an altitude or excessively restrictive criteria because pilots will not follow unrealistic SOPs. In a flight operation with multiple pilots, it would be good to get input from the pilots as to what they think should be used. This will result in a stable approach SOP that is realistic for that flight operation, and pilots who have been asked for their input are more likely to adhere to the resulting SOP, even if it is not exactly what they recommended.