What the profile screens for
A sustained difference between left and right propulsion parameters appears during taxi movement.
Why it matters
The pattern may be deliberate steering technique, system behaviour, or a propulsion asymmetry that needs context and validation.
Build the event around relationships—not one number.
Define the operating context
Identify the taxi state, aircraft configuration, location, and any required external data before applying logic.
Screen the signal relationship
Use validated combinations of left engine thrust, right engine thrust, steering angle; avoid treating one isolated value as the whole event.
Confirm it is a genuine event
Check polarity, units, source, recording rate, dropouts, air/ground logic, persistence, and false-positive mechanisms.
Connect data to the safety question
Review procedures, reports, weather, airport and traffic context, exposure, recurrence, and the strength of the related barriers.
Recorded signals that may help explain the event.
Questions before conclusions
- Q1
Are left engine thrust, right engine thrust, steering angle valid, correctly decoded, time-aligned, and sampled well enough for this event?
- Q2
What changed immediately before, during, and after the asymmetric thrust during taxi indication?
- Q3
How do aircraft configuration, weather, airport geometry, automation state, and crew reports change the interpretation?
- Q4
Which current flight manual, SOP, maintenance, or operator event definition controls the final conclusion?
Safety topics that broaden the event review.
Runway confusion
Misidentification of runway, taxiway, intersection, direction, or airport geometry before a takeoff, landing, crossing, or line-up action.
Open topic profile ↗SAT-006 · Runway safetyRunway condition code
Use and cross-checking of runway condition assessment codes, contaminant descriptions, temperature, and reported braking information.
Open topic profile ↗SAT-007 · Runway safetyRunway occupancy
Time and movement patterns while entering, crossing, lining up, landing, vacating, or otherwise occupying an active runway.
Open topic profile ↗SAT-008 · Runway safetyRunway lighting and markings
The role, condition, interpretation, and operational limitations of runway, taxiway, stop-bar, centreline, and approach visual aids.
Open topic profile ↗SAT-009 · Runway safetyRunway hotspots
Airport locations with complex geometry or a history of confusion, incursion, excursion, or surface-navigation difficulty requiring heightened awareness.
Open topic profile ↗SAT-092 · Ground operations & maintenanceAircraft towing
Control of route, speed, clearance, steering, braking, communication, lighting, wing walkers, and equipment during aircraft towing.
Open topic profile ↗SAT-093 · Ground operations & maintenanceRamp collision
Contact risk among aircraft, vehicles, equipment, structures, or people in congested ramp and stand environments.
Open topic profile ↗SAT-094 · Ground operations & maintenanceGround damage
Aircraft damage during parking, movement, servicing, loading, maintenance, or weather exposure, including detection and reporting barriers.
Open topic profile ↗SAT-095 · Ground operations & maintenanceForeign object debris
Objects on operational surfaces or in work areas that can damage aircraft, engines, tyres, systems, vehicles, or people.
Open topic profile ↗SAT-096 · Ground operations & maintenanceAircraft de-icing
Inspection, fluid selection and application, holdover assessment, contamination checks, communication, sequencing, and clean-aircraft assurance.
Open topic profile ↗SAT-097 · Ground operations & maintenanceAircraft fueling
Fuel type, quantity, quality, bonding, pressure, spill, fire, communication, passenger, and vehicle risk during aircraft refueling or defueling.
Open topic profile ↗SAT-099 · Ground operations & maintenanceMaintenance error
Unintended maintenance action or omission shaped by task design, data, tools, access, handover, pressure, supervision, and verification.
Open topic profile ↗Runway Excursion
Explore overruns and veer-offs as the combined result of approach energy, runway condition, touchdown, deceleration, and directional control.
Open topic brief ↗Flight OperationsRejected Takeoff
Understand the time-critical stop decision through speed, failure recognition, runway remaining, braking, spoilers, and reverse thrust.
Open topic brief ↗12 useful starting points
Terminology and topic relationships select these links; the publisher source remains authoritative.
Annual Safety Review 2025
EASA's review uses occurrence and accident information to describe performance across aviation domains and to support the European safety-risk-management process.
Open official sourceStatistical Summary of Commercial Jet Airplane Accidents, 1959–2024
Boeing's 56th annual statistical summary organizes commercial-jet accident data using stated definitions and the CAST/ICAO occurrence taxonomy.
Open official sourceIATA Annual Safety Report — 2024
IATA's 61st annual report provides an interactive, method-defined view of commercial aviation accident performance and contributing-factor classifications.
Open official sourceAC 91-79B — Aircraft Landing Performance and Runway Excursion Mitigation
This FAA circular brings together landing-performance planning, time-of-arrival assessment, RCAM information, and operational practices for reducing runway-excursion risk.
Open official sourceSAFO 18009 — SAFO 18009, Risk of Runway Number Transposition Leading to a possible "Runway Overrun" During Takeoff at San Francisco International Airport ( SFO )
Official U.S. Federal Aviation Administration material indexed for approach and landing and takeoff. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08003 — Guidance Material for Contaminated Runway Landing Operations
Official U.S. Federal Aviation Administration material indexed for approach and landing and runway safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 06010 — Preventing accidents following rejected takeoff ( RTO ): Pilot Guide
Official U.S. Federal Aviation Administration material indexed for takeoff. Open the publisher source for the complete document, scope, and current status.
Open official sourceA320 – Runway overrun
Official Airbus Safety First material indexed for approach and landing and runway safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceFurther Preventing Runway Overrun
Official Airbus Safety First material indexed for approach and landing and runway safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceIs it a Loss of Braking?
Official Airbus Safety First material indexed for runway safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceLateral runway excursions upon landing
Official Airbus Safety First material indexed for approach and landing and runway safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceLow Speed Rejected Take-Off upon Engine Failure
Official Airbus Safety First material indexed for takeoff and powerplant. Open the publisher source for the complete document, scope, and current status.
Open official source