scope:

INTRODUCTION

This leaflet contains recommendations for the design of facilities for open-orifice, gravity filling of tanks in amplification of Leaflet 701.

Although open-orifice refuelling is principally featured on small rotorcraft with relatively simple fuel systems, gravity-filling can provide a readily available safe back-up refuelling method for rotorcraft equipped with a closed circuit pressure refuelling system.

Access into fuel tanks through standard filler orifices also facilitates defuelling by means of a suction defuelling tube inserted into the tank. This feature of the rotorcraft can prove useful in the case of salvage activity, following a crash landing, when access to the normal suction defuelling connector and tank drains may not be possible.