Accueil       Fonctionnalités       Plan du site      English

Arrow
Arrow
Slider

Seat-Back Failure Causes Loss of Control


Seat attachment


Failure point

 

The Cessna 310 was observed in a cruise configuration low pass over the private strip. As the aircraft reached the end of the runway, the pilot pulled the aircraft into a steep climb. The aircraft continued to climb steeply until it stalled and entered a flat spin. It hit the ground with no forward speed. The pilot and his passenger died. The aircraft was destroyed in the ensuing fire.

The TSB (A95O0078) concluded that, when the pilot initiated the abrupt pull up, his weight overloaded the design specifications of the seat back, causing it to fail rearward. With the sudden G loading, the pilot fell backward when the seat failed, pulling the control column fully aft. Hanging back from the yoke, he was physically unable to recover from the low altitude stall/spin.

The TSB Engineering Laboratory confirmed that the seat met the design specifications set out in Technical Standard Order TSO 25a. The TSO requires that the seat support a 190 lb. pilot throughout all normal flight manoeuvres (maximum manoeuvring load of 2G). If the 380 lb. pilot (at double the weight in the certification standard) pulled the aircraft nose up to 45° in a smooth 2G manoeuvre, his weight on the back of the seat would have greatly exceeded the ultimate load limit. The Lab found that the seat back had failed in overload.

Non-survivable

Recognizing that people today are bigger, TSO-25a was changed in 1969 and again in 1983. However, there are still a lot of older aircraft built to the old design standards. Creative solutions might see periodic dye-penetrant testing or the x raying of seat fittings, medical restrictions on pilots' weight or a placard on the aircraft seat with a weight restriction on the pilots who fly these older birds.

Originally Published: 2/1997
Original Article: Seat-Back Failure Causes Loss of Control

Self-Paced Recency
Aviation Safety Newsletter
Emergency Operations
Smart Pilot Seminars
Features
Drones
General Aviation Safety
AOPA Flight Training
Ask ATS
Winter Flying
Fuel Management
Float Planes
Upset Training
Fit to Fly
ELTs
SAR

Ressource pilote

Ask ATS

Demandez à ATS

Avez-vous des questions portant sur le service ATS ? En collaboration avec NAV CANADA, PiloteAverti.ca a des réponses !

Allez-y !

Weather

Météo

Avez-vous les conditions météo nécessaires pour voler? Consultez les prévisions locales et nationales.

Allez-y !

TSB

BST

PiloteAverti.ca vous offre des résumés pertinents et succints des enquêtes du BST et un accès direct à son site Internet.

Allez-y!

Interactive

Contenu interactif

Jetez un coup d’oeil à notre formation en ligne et notre contenu interactif sur PiloteAverti.ca.

Allez-y !

NOTAMs

NOTAM

NOTAM fournis par NAV Canada.

Allez-y !

ASI

Institut de sécurité aérienne

Obtenez un accès au contenu et aux cours interactifs en ligne offerts par l'Institut de sécurité aérienne de l'AOPA !

Allez-y !

ELTs

ELT

Les Radiobalises de repérage d'urgence (ELT) à la fine pointe en matière de Recherche et sauvetage.

Allez-y !

ASL

Sécurité aérienne – Nouvelles

Les articles incluent la sécurité de l’aviation, les informations en matière de sécurité issues d’accidents et incidents, les informations de sécurité.

Alley-z !

En association avec l’:

aopa logocopa logo

sar logo

Nous tenons à souligner le soutien financier du gouvernement du Canada tout particulièrement le Fonds des nouvelles initiatives en Recherche et sauvetage (FNI RS)