Approach configuration incomplete at gate — FDM event profile

01 · Monitoring purpose

What the profile screens for

Gear, flap, slat, spoiler-arm, or other required landing configuration is incomplete at a validated approach gate.

Why it matters

Late configuration can increase workload, drag changes, checklist compression, speed instability, and go-around risk.

Flight-phase contextApproach

Risk lensesRunway excursion / abnormal runway contactTerrain collision / CFITOperational procedure deviation

02 · Candidate logic frame

Build the event around relationships—not one number.

01 · Gate

Define the operating context

Identify the approach state, aircraft configuration, location, and any required external data before applying logic.

02 · Detect

Screen the signal relationship

Use validated combinations of gear position, flap position, slat position; avoid treating one isolated value as the whole event.

03 · Validate

Confirm it is a genuine event

Check polarity, units, source, recording rate, dropouts, air/ground logic, persistence, and false-positive mechanisms.

04 · Contextualise

Connect data to the safety question

Review procedures, reports, weather, airport and traffic context, exposure, recurrence, and the strength of the related barriers.

03 · Signal constellation

Recorded signals that may help explain the event.

gear positionflap positionslat positionspoiler armedradio altitude

Radio altitude

Height derived from radio altimetry, normally representing the distance from the aircraft to terrain directly below within the system's operating range.

Open parameter guide ↗deg or discrete

Ground spoiler position

Position or deployment state of panels used to reduce lift and increase wheel loading after touchdown.

Open parameter guide ↗discrete

Landing gear status

Command, position, lock, and ground-sensing states associated with the landing gear; these are separate signals with different meanings.

Open parameter guide ↗

04 · Validation and analysis

Questions before conclusions

Q1
Are gear position, flap position, slat position valid, correctly decoded, time-aligned, and sampled well enough for this event?
Q2
What changed immediately before, during, and after the approach configuration incomplete at gate 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?

05 · Connected intelligence briefs

Safety topics that broaden the event review.

Topic atlas11 operational connections

SAT-015 · Approach & landing

Non-precision approach

Approach risk where continuous vertical guidance is unavailable or not used, emphasizing descent planning, step-down constraints, minima, and path monitoring.

Open topic profile ↗SAT-033 · Aircraft control & automation

Manual flying proficiency

The knowledge, practice, sensory cues, monitoring, and aircraft-handling skills needed when automation is reduced, inappropriate, or unavailable.

Open topic profile ↗SAT-035 · Aircraft control & automation

Autothrottle management

Awareness and control of automatic thrust state, mode, limits, disconnection, wake-up behavior, and relationship to speed and energy.

Open topic profile ↗SAT-036 · Aircraft control & automation

Trim system events

Normal, abnormal, runaway, mistrim, or unexpected trim behavior and its effect on control forces, attitude, speed, and system response.

Open topic profile ↗SAT-071 · Human performance & CRM

Fatigue risk

Sleep loss, circadian disruption, workload, duty timing, recovery, commuting, and health factors that can reduce alertness and performance.

Open topic profile ↗SAT-073 · Human performance & CRM

Aeronautical decision-making

Framing choices, evaluating risk, managing uncertainty and bias, selecting action, and revising a plan when evidence changes.

Open topic profile ↗SAT-075 · Human performance & CRM

Startle and surprise

Immediate physiological and cognitive response to an unexpected event, and the processes that support stabilization, diagnosis, and recovery.

Open topic profile ↗SAT-076 · Human performance & CRM

Operational communication

Clear, timely, understood exchange of clearances, intentions, threats, decisions, status, and handovers across aviation teams.

Open topic profile ↗SAT-078 · Human performance & CRM

Authority gradient

How rank, culture, expertise, confidence, and team climate affect challenge, speaking up, listening, and shared decisions.

Open topic profile ↗SAT-079 · Human performance & CRM

Distraction and interruption

Loss or redirection of attention during a task, including interruption management, task resumption, sterile-flight-deck discipline, and error traps.

Open topic profile ↗SAT-080 · Human performance & CRM

Fitness for duty

Physical and psychological readiness for safety-critical work, including illness, medication, stress, impairment, fatigue, and self-reporting.

Open topic profile ↗

Deep briefs3 detailed research guides

Flight Operations

Unstable Approach

Recognize when path, speed, configuration, power, or crew readiness has moved outside applicable stabilized-approach criteria.

Open topic brief ↗Flight Operations

Go-Around Decision and Execution

Treat the go-around as both a normal safety decision and a manoeuvre whose mode, thrust, configuration, path, and workload must be monitored.

Open topic brief ↗Flight Operations

Landing Performance

Connect approved landing-distance data with current wind, runway condition, aircraft state, touchdown point, and deceleration technique.

Open topic brief ↗

06 · Related official-source reading

12 useful starting points

Terminology and topic relationships select these links; the publisher source remains authoritative.

No copied report filesSearch all related records →

U.S. Federal Aviation AdministrationRelated safety-topic match

AC 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 source

U.S. National Transportation Safety BoardRelated safety-topic match

Safety Alert SA-077 — Stabilized Approaches Lead to Safe Landings

The NTSB alert highlights the need to establish and maintain a stabilized approach and to go around when an approach falls outside applicable criteria.

Open official source

Flight Safety FoundationRelated safety-topic match

Go-Around Decision-Making and Execution Project — Final Report

The Flight Safety Foundation project examines go-around policy compliance, decision biases, operational pressures, and the risks that also need to be managed during go-around execution.

Open official source

U.S. Federal Aviation AdministrationRelated safety-topic match

SAFO 21006 — SAFO 21006, Boeing Model 757 and 767 Airplane Inadvertent Pilot Activation of Go-Around Mode

Official U.S. Federal Aviation Administration material indexed for aviation safety. Open the publisher source for the complete document, scope, and current status.

Open official source

U.S. Federal Aviation AdministrationRelated safety-topic match

SAFO 15004 — SAFO 15004, Scenario-Based Go-Around Training

Official U.S. Federal Aviation Administration material indexed for human factors. Open the publisher source for the complete document, scope, and current status.

Open official source

U.S. Federal Aviation AdministrationRelated safety-topic match

SAFO 10005 — Go-Around Callout and Immediate Response

Official U.S. Federal Aviation Administration material indexed for aviation safety. Open the publisher source for the complete document, scope, and current status.

Open official source