Overview
ISO 11995:1996 - "Aircraft - Stability requirements for loading and servicing equipment" defines uniform criteria, calculation methods and test procedures to assess the stability of aircraft ground support equipment (GSE). The standard covers static and wind stability for equipment used in a static position on aircraft (e.g., container and pallet loaders, catering trucks, passenger stairs, maintenance and fueling platforms). It is intended to provide consistent safety criteria for manufacturers, airlines and ground-handling organizations without prescribing detailed design solutions.
Key topics and requirements
- Scope and applicability
- Applies to typical aircraft loading and servicing equipment (see referenced ISO standards for specific equipment types).
- Excludes forklifts, aircraft de-icers, equipment with rotating booms or equipment whose normal operation includes movement in elevated positions.
- Definitions and objectives
- Clear definitions for static stability, wind stability, tip point, pivot point, stabilizers and outriggers.
- Static stability objective: vehicle remains stable at maximum elevation when subjected to payload asymmetry and ramp slope conditions.
- Wind stability objective: vehicle remains stable at maximum elevation under steady-state wind (specific wind speeds and conditions are referenced in the standard).
- Classification of stability systems
- Describes systems in increasing effectiveness: integral chassis methods (heavy-duty springs, shock absorbers, tyre pressure, stabilizer bars, spring lockouts), stabilizer systems (self-levelling hydraulic pads), and outrigger systems (extendable feet beyond the vehicle planview).
- Calculation and test methods
- Provides formulas and test procedures for steady-state wind stability and combined static/wind checks (used to calculate overturning moments and assess tipping risk).
- Mandatory vs recommended requirements
- Uses “shall” for minimum essential criteria and “should” for recommended practices; deviations from recommendations require testing and service evaluation.
Practical applications
- Ensures safe operation of GSE during loading, servicing and servicing operations adjacent to aircraft.
- Used to evaluate equipment performance under ramp slopes and wind loads, preventing tipping and ensuring personnel safety.
- Guides development of operating rules (e.g., wind-speed limits, handling of payload asymmetry) and maintenance/test regimes.
Who uses this standard
- GSE manufacturers and designers
- Airlines and ground handling operators
- Airport safety and operations managers
- Test laboratories and certification bodies
- Maintenance and engineering teams responsible for equipment commissioning and in-service evaluation
Related standards
Keywords: ISO 11995, aircraft loading and servicing equipment, GSE stability, wind loads, stabilizers, outriggers, ground support equipment safety.
