<< contaminated runway | contingency fuel | contingency rating >>
Back to: "C"
contingency fuel
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Flight planning and fuel management manual. Montrea137l, 2012. (Doc. 9976).
- Nota adicional1
- Contingency fuel (5% of the planned trip fuel or of the fuel required from the point of in-flight re-planning based on the consumption rate used to plan the trip but not less than the amount required to fly for five minutes at holding speed at 450 m (1,500 ft) above the destination aerodrome in standard conditions).
- Contexto
- Coverage is the percentage of flights that burn less than their contingency fuel. A coverage value of 95%, for example, means that 95% of flights should arrive with all their alternate fuel (if applicable) and final reserve fuel intact. As the coverage value increases so does the required fuel, albeit disproportionately as the difference between 95% and 99% coverage is not 4% fuel, but an amount, which depends on the variability of the fuel consumption on a specific route. 100% coverage implies that there is a low probability of consuming all contingency fuel. The choice of coverage values is crucial to the successful implementation of SCF, and the operator should have an approved process to determine which coverage (values ranging from 85% and 99% have been used) should be used depending on the type of flight and the actual conditions.
- An aeroplane arrives in the vicinity of the destination aerodrome (MMAB) at 1500 UTC with flight planned fuel on board. The aeroplane is asked to hold with an EFC time of 1510 UTC due to traffic congestion. This is acceptable to the PIC as sufficient contingency fuel was uplifted for unanticipated delays. Time passes and it becomes apparent that 10 minutes of holding will be insufficient to ease the congestion. The PIC requests delay information from ATC and is informed to expect an additional 15 minute delay and is subsequently issued a new EFC time of 1525 UTC. The PIC checks the fuel state and informs ATC that he cannot hold any longer than the original 10 minutes and requests a clearance to his alternate aerodrome (MMXZ). The PIC receives a new clearance and proceeds to MMXZ which now becomes the committed aerodrome of intended landing as he has consumed most of his contingency fuel and is concerned that he may begin burning into required reserves.
- Português
- combustível de contingência