Casualties unknown

GPIAAF Publishes Safety Study on General Aviation Approach, Landing and Take-Off Events (CS-ASQ)

Cascais, PT

On August 20, 2011, a Cessna 152 (registration CS-ASQ) operated by Private was involved in an aviation accident near Cascais, PT. This summary draws on records from the Portuguese Office for the Prevention and Investigation of Accidents in Civil Aviation and Rail (GPIAAF); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Portuguese Office for the Prevention and Investigation of Accidents in Civil Aviation and Rail (GPIAAF)Primary reportUpdated 2026-10-18Data APIEditorial standards

The GPIAAF has released a safety study examining general aviation approach, landing, and take-off accidents and incidents in Portugal from 2011 to 2021, aiming to assist in prevention activities.

Study Overview

The Gabinete de Prevenção e Investigação de Acidentes com Aeronaves e de Acidentes Ferroviários (GPIAAF) published Safety Study ALTO (Approach, Landing and Take-Off Accidents) covering the period 2011 to 2021. The study, identified as document 2021-SS-01, focuses on general aviation events in Portugal.

Purpose and Scope

According to the study's notes, the safety study aims to present information to assist in the prevention of accidents and incidents in national general and light sport aviation. It is specifically centered on events classified as approach, landing, and take-off occurrences.

Structure and Content

The study includes a foreword describing GPIAAF's mission to investigate civil aviation and rail occurrences to identify causes and produce reports. A glossary defines terms such as ALTO (Approach, Landing and Take-Off events), runway excursion, abnormal runway contact, and others relevant to the analysis.

The document is organized into sections covering the safety study framework, a national perspective, selected events, latent conditions, the decision-making process, consequences, and main conclusions. Annex I lists selected ALTO events with their identifiers, including occurrences involving aircraft CS-DIN, CS-ASQ, CS-AHW, CS-ADF, CS-UQD, CS-USR, G-AWXR, and CS-XAB, among others.

Publication Details

The study was published on November 5, 2021, in both Portuguese and English, with the Portuguese text prevailing in case of discrepancies. It is available from GPIAAF, based in Lisbon, Portugal.

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Frequently asked questions

What happened in the 20 Aug 2011 Cessna 152 accident near Cascais, PT?

The GPIAAF has released a safety study examining general aviation approach, landing, and take-off accidents and incidents in Portugal from 2011 to 2021, aiming to assist in prevention activities.

What aircraft was involved and where did it happen?

The accident on 20 Aug 2011 involved a Cessna 152, registration CS-ASQ, operated by Private, at Cascais, PT.