Appendix B Term Redundancy The presence of more than one independent means for accomplishing a given function or flight operation.
Significant Transient A transient that would lead to a significant reduction in safety margins, an increase in flightcrew workload, discomfort to the flightcrew, or physical distress to passengers or cabin crew, possibly including non-fatal injuries.
Note: The flightcrew should be able to respond to any significant transient without:
• Exceptional piloting skill, alertness, or strength,
• Forces greater than those given in § 25.143(c), and
• Accelerations or attitudes in the airplane that might result in further hazard to secured or non -secured occupants.
Note: 14 CFR 25.143(d) is the appropriate paragraph of the regulation for a certification basis later than amendment 121.
System A combination of components, parts, and elements that are inter-connected to perform one or more specific functions.
Warning A flight deck indication that alerts the flightcrew to a non-normal operational or airplane system requiring immediate recognition. Immediate corrective or compensatory action by the flightcrew is required.
Definition Select The flightcrew action of requesting functionality or an end state condition.
Stability Augmentation System Automatic systems that provide or enhance stability for specific aerodynamic characteristics of an airplane (for example, yaw damper, longitudinal stability augmentation system, Mach trim).
Transient A disturbance in the control or flight path of the airplane that is not consistent with response to flightcrew inputs or environmental conditions.
AC 25.1329 1C CHG 2 B-6
App endix C APPENDIX C. ACRONYMS Table C-1. Acronyms and Definitions Acronym Definition AC Advisory Circular ADI Attitude Director Indicator AFM Airplane Flight Manual AGL Above Ground Level ARP Aerospace Recommended Practice ATC Air Traffic Control CDI Course Deviation Indicator CFR Code of Federal Regulations CG Center of Gravity CWS Control Wheel Steering DA Decision Altitude DA(H) Decision Altitude (Height) DME Distance Measuring Equipment EVS Enhanced Vision System FAA Federal Aviation Administration FCOM Flightcrew Operations Manual FD F light Director FGS Flight Guidance System FL Flight Level FMA Flight Mode Annunciator C-1
CHG 1 Appendix C C-2 Acronym Definition FMS Flight Management System GBAS Ground-Based Augmentation System GLS GBAS Landing System GPWS Ground Proximity Warning System HDD Head Down Display HUD Head Up Display ICAO International Civil Aviation Organization ILS Instrument Landing System IMA Integrated Modular Avionics IMC Instrument Meteorological Conditions LNAV Lateral Navigation LOC Localizer MDA(H) Minimum Descent Altitude (Height) MSL Mean Sea Level MSP Mode Select Panel MUH Minimum Use Height (autopilot) NAV Navigation ND Navigation Display NDB Non Directional Beacon PANS-OPS Procedures for Air Navigation Services –Aircraft Operations PF Pilot Flying PFD Primary Flight Display PM Pilot Monitoring
C HG 1 Appendix C C-3 Acronym Definition RNAV Area Navigation RNP Required Navigation Performance RTO Rejected Takeoff RVSM Reduced Vertical Separation Minimum SAE Society of Automotive Engineers TCAS Traffic Alert and Collision Avoidance System TCS Touch Control Steering TERPS Terminal Instrument Procedures TOGA Takeoff/Go-Around VDF/MDF Demonstrated Flight Dive Speed/Demonstrated Flight Dive Mach VMO/MMO Maximum Operating Limit Speed/Maximum Operating Limit Mach VR Rotation Speed VSR Reference Stall Speed (see § 25.103) V2 Takeoff Safety Speed VMC Visual Meteorological Conditions VNAV Vertical Navigation VOR Very High Frequency Omnidirectional Range WAT Weight, Altitude, and Temperature xLS ILS or GLS
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