A newly type-rated Learjet 31A pilot raises a practical and operationally significant question that surfaces frequently among crews transitioning into turbine business jet operations: whether a general-purpose EFB platform like ForeFlight provides sufficient fidelity for performance and weight-and-balance calculations on a Part 25 certificated aircraft. The Learjet 31A, a derivative of the 35/36 series featuring winglets and an uprated Garrett TFE731-2-3B powerplant, demands rigorous performance planning due to its relatively modest climb gradient margins, sensitivity to density altitude, and the strict field-length accountability requirements that govern certificated transport-category operations. The question reflects a genuine knowledge gap that exists for many pilots completing their initial type ratings, where simulator training covers normal and emergency procedures thoroughly but may leave performance planning workflows less defined.
ForeFlight has substantially expanded its performance capabilities in recent years, most notably through the integration of its Performance Pro module, which provides airport analysis and runway-specific takeoff and landing data for a growing list of turbine aircraft. For certain airframes, ForeFlight's performance data is sourced from AFM-based algorithms and can satisfy Part 91 operational requirements when properly configured and validated against the aircraft's approved documentation. However, coverage is not universal, and the Learjet 31A — a legacy platform with a relatively small active fleet — may not be fully supported within ForeFlight's performance database to the standard required for accountable operations. Operators should verify directly with ForeFlight whether the specific variant and configuration of their aircraft is supported before relying on the platform for field performance calculations.
For Part 135 and Part 91 Subpart K operators, performance calculations typically carry a higher burden of validation. Many business aviation flight departments and charter operators running Learjet-series aircraft use dedicated runway analysis services — Aircraft Performance Group (APG) being the most widely recognized in the industry — which provide airport- and conditions-specific takeoff and landing performance data that is AFM-derived, legally defensible, and updated on a regular cycle. These services account for obstacle clearance, runway slope, contamination, and engine-inoperative climb gradient requirements in ways that a generalized EFB performance module may not fully replicate. Some operators layer both tools, using ForeFlight for situational awareness and weight-and-balance, while sourcing certified performance numbers from a dedicated analysis provider.
The weight-and-balance component of the question is more straightforward. ForeFlight's W&B module, when properly configured with the aircraft's specific loading data, can serve as a capable and FAA-acceptable tool for Part 91 operations. The critical step is ensuring the aircraft profile within ForeFlight accurately reflects the as-equipped, as-delivered configuration — including any interior modifications, avionics upgrades, or ballast changes that have altered the empty weight and CG. For aircraft operating under an approved Weight and Balance Control Program under Part 135, the operator's manual likely specifies approved methods and tools, which may or may not include third-party EFB applications.
The broader trend evident in this discussion is the increasing reliance on subscription-based EFB platforms by smaller flight departments and owner-operators who lack dedicated dispatch or performance engineering support. While platforms like ForeFlight have significantly democratized access to sophisticated aviation tools, the transition to transport-category jet operations requires crews to understand the precise limitations and certification basis of every computational tool in their workflow. A newly typed crew on a Learjet 31A operating under any certificate should treat ForeFlight as one layer of a performance verification process — not as a standalone replacement for AFM-based analysis or, where required by operations specifications, an approved runway analysis service.