What the profile screens for
Normal or lateral acceleration exceeds an aircraft- and programme-specific monitoring condition in cruise.
Why it matters
Load excursions may indicate turbulence, manoeuvre, control response, or an airworthiness-relevant event.
Build the event around relationships—not one number.
Define the operating context
Identify the cruise state, aircraft configuration, location, and any required external data before applying logic.
Screen the signal relationship
Use validated combinations of normal acceleration, lateral acceleration, airspeed; 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.
Normal acceleration
Acceleration measured broadly along the aircraft's vertical body axis; its touchdown peak can help characterize a landing load when interpreted with other signals.
Open parameter guide ↗ktCalibrated airspeed
Indicated airspeed corrected for instrument and position error, as provided by the aircraft data system.
Open parameter guide ↗degPitch attitude
Aircraft body attitude above or below the local horizontal reference.
Open parameter guide ↗degRoll angle
Aircraft bank attitude about the longitudinal axis.
Open parameter guide ↗Questions before conclusions
- Q1
Are normal acceleration, lateral acceleration, airspeed valid, correctly decoded, time-aligned, and sampled well enough for this event?
- Q2
What changed immediately before, during, and after the cruise load-factor exceedance 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.
Bird ingestion
Engine or propulsive-system effects following bird or wildlife ingestion, from transient parameter change to damage, failure, or rejected takeoff.
Open topic profile ↗SAT-058 · Powerplant & fuelFuel contamination
Water, microbes, particulates, incorrect fuel, chemicals, or other contaminants that can affect engines, tanks, filters, sensors, and fuel delivery.
Open topic profile ↗SAT-101 · ATM, navigation & airspaceLoss of separation
Reduction below applicable aircraft separation minima, including detection, communication, maneuvering, recovery, and systemic contributors.
Open topic profile ↗Windshear and Microburst
Recognize rapid changes in wind vector and the resulting airspeed, path, thrust, and vertical-energy effects close to the ground.
Open topic brief ↗Aircraft SystemsFlight-Deck Automation
Use mode awareness, active monitoring, and aircraft-response verification to keep automation aligned with crew intent.
Open topic brief ↗Aircraft SystemsEngine Failure and Thrust Loss
Separate commanded thrust, actual engine response, system effects, and crew management across partial, asymmetric, and complete thrust-loss events.
Open topic brief ↗12 useful starting points
Terminology and topic relationships select these links; the publisher source remains authoritative.
SAFO 05007 — Announcing AC 120-88, Preventing Injuries Caused by Turbulence
Official U.S. Federal Aviation Administration material indexed for weather. Open the publisher source for the complete document, scope, and current status.
Open official sourceManaging Severe Turbulence
Official Airbus Safety First material indexed for weather. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 14002 — SAFO 14002, Global Positioning System ( GPS )/Global Navigation Satellite System ( GNSS ) Navigator/Autopilot Compatibility
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and navigation and surveillance. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 10021 — Adverse Levels of Porous Coke for All Engine and Oil Combinations
Official U.S. Federal Aviation Administration material indexed for powerplant. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08005 — Preflight of helicopter hydraulic systems to include validation of control movement smoothness and identification of adverse flight control “stick-jump.”
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and airworthiness and systems. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08015 — Preflight check of helicopter hydraulic systems to include validation of control movement smoothness and identification of adverse flight control “stick-jump”
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and airworthiness and systems. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 06017 — Equipment Training and Checking for Helicopter Operators on the SPZ-7000 or SPZ-7600 Dual Digital Automatic Flight Control Systems
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and human factors. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 05002 — Multiple full deflection, alternating flight control inputs
Official U.S. Federal Aviation Administration material indexed for flight controls and automation. Open the publisher source for the complete document, scope, and current status.
Open official sourceA380 Development of the Flight Controls
Official Airbus Safety First material indexed for aviation safety. Open the publisher source for the complete document, scope, and current status.
Open official sourceDual Side Stick Inputs
Official Airbus Safety First material indexed for flight controls and automation. Open the publisher source for the complete document, scope, and current status.
Open official sourceEngine Relight After an All-engine Flameout
Official Airbus Safety First material indexed for powerplant. Open the publisher source for the complete document, scope, and current status.
Open official sourceEngine Thrust Management – Thrust Setting at Takeoff
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