After all communication with the outside has been cut off, the pressure shall be gradually increased, through the pipe connection through which fuel is fed to the engine, to the internal pressure specified in point 1.1.9 and this pressure shall be maintained for at least 60 seconds.
In de volledig afgedichte tank wordt de druk via de brandstoftoevoerleiding naar de motor geleidelijk opgevoerd tot de in punt 1.1.9 aangegeven inwendige druk en deze druk wordt ten minste 60 seconden lang gehandhaafd.