40.2 Definitions

40.2.2 Define and explain the use of the following terms in the correct context (include appropriate fuel reserves where applicable):

(a) inflight revised point of safe return (revised PSR)

(b) PNR factor

(c) equi-time point (ETP)

(d) diversion decision point (DDP)

Diversion Decision Point (DDP) Operations

On certain flights, the required fuel load can limit the available payload. To minimise fuel and increase the payload capacity, flights may be planned as a Diversion Decision Point (DDP) operation. A DDP plan is specifically designed for enhancing payload by allowing a portion of the contingency fuel from point A to point B to be exchanged for an equivalent weight of payload, but this is only permitted under specific conditions.

Standard flight planning accounts for Contingency Reserves Fuel, which is typically about 2% of the planned trip fuel from A to B, adjusted for Planned Departure Arrival (PDA). However, when a DDP is designated for the route and the enroute refueling airfield is forecasted to meet or exceed alternate minima during the applicable period, the Contingency Reserve Fuel can be reduced to the following: