So, as an example, on a flight from SIN to LHR on a 747-400 with a trip fuel of say 144.0 tonnes, and reserves plus alternate of 7.6 you would have to take 14.4 tonnes of contingency and therefore Planned Remaining of 22.0 tonnes?
" to fly for a period of 10
percent of the total time required to
fly from the airport of departure to,
and land at, the airport to which it was
released"