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Refer to figure.
A twin engined turbojet is being operated for a Commercial Air Transport flight. Given the following information, if the decision point moves from DP1 to DP2, what will happen with the amount of Contingency Fuel required?

TAS: 400 kt
Wind: zero
Fuel consumption: 2000 kg/h
Additional Fuel: not required
Extra Fuel: not required

  • A
    It will decrease by 100 kg.
  • B
    It will remain unchanged.
  • C
    It will increase by 500 kg.
  • D
    It will increase by 150 kg.

Refer to figure.
Note: For both scenarios (DP over DP1 or DP2), taxi, alternate, final reserve and additional fuel will remain the same => Therefore, we only really need to compare trip and contingency fuel.
Wind Calm => TAS = GS

Regulation (EU) No 965/2012
AMC1 CAT.OP.MPA.150(b) Fuel policy
PLANNING CRITERIA — AEROPLANES
(b) Reduced contingency fuel (RCF) procedure
If the operator’s fuel policy includes pre-flight planning to a destination 1 aerodrome (commercial destination) with an RCF procedure using a decision point along the route and a destination 2 aerodrome (optional refuel destination), the amount of usable fuel, on board for departure, should be the greater of (b)(1) or (b)(2):

FIRST SCENARIO (DECISION POINT OVER C):
(1) The sum of:

(i) taxi fuel; N/A

(ii) trip fuel to the destination 1 aerodrome, via the decision point;

Distance DEP-DP1-DES: 2000 NM + 400 NM + 400 NM = 2 800 NM
Flight Time = 2 800 NM / 400 kt = 7 h
FF: 2 000 kg/h

  • Therefore, Trip Fuel = 7 h x 2000 kg/h = 14 000 kg


(iii) contingency fuel equal to not less than 5 % of the estimated fuel consumption from the decision point to the destination 1 aerodrome;

Distance DP1-DES: 400 NM + 400 NM = 800 NM
Flight time: 800 NM / 400 kt = 2 h
2 h x 2000 kg/h = 4000 kg

  • Contingency = 5% x 4000 kg = 200 kg


(iv) alternate fuel or no alternate fuel if the decision point is at less than 6 hours from the destination 1 aerodrome and the requirements of CAT.OP.MPA.180(b)(2), are fulfilled; N/A
(v) final reserve fuel; N/A
(vi) additional fuel; and N/A
(vii) extra fuel if required by the commander. N/A

FOR (b)(1) – we have a value of 14 000 kg + 200 kg = 14 200 kg


(2) The sum of:

(i) taxi fuel; N/A
(ii) trip fuel to the destination 2 aerodrome, via the decision point;

Distance DEP-DP1-EA: 2000 NM + 200 NM = 2200 NM
Flight time: 2200 NM / 400 kt = 5.5 h
5.5 h x 2000 kg/h = 11 000 kg


(iii) contingency fuel equal to not less than the amount calculated in accordance with (a)(3)(*) above from departure aerodrome to the destination 2 aerodrome;

11 000 kg x 5% = 550 kg


(iv) alternate fuel, if a destination 2 alternate aerodrome is required; N/A
(v) final reserve fuel; N/A
(vi) additional fuel; and N/A
(vii) extra fuel if required by the commander. N/A

FOR (b)(2) – we have a value of 11 000 kg + 550 kg = 11 550 kg


=> (b)(1) > (b)(2) => 14 200 kg > 11 550 kg => So our contingency fuel will be 200 kg in the first scenario.

SECOND SCENARIO (DECISION POINT OVER D):
(1) The sum of:

(ii) trip fuel to the destination 1 aerodrome, via the decision point;

Distance DEP-DP2-DES: 2000 NM + 400 NM + 400 NM = 2 800 NM

Flight Time = 2 800 NM / 400 kt = 7 h
FF: 2 000 kg/h

  • Therefore, Trip Fuel = 7 h x 2000 kg/h = 14 000 kg


(iii) contingency fuel equal to not less than 5 % of the estimated fuel consumption from the decision point to the destination 1 aerodrome;

Distance DP2-DES: 400 NM
Flight time: 400 NM / 400 kt = 1 h
1 h x 2000 kg/h = 2000 kg

  • Contingency = 5% x 4000 kg = 100 kg


(...)

FOR (b)(1) – we have a value of 14 000 kg + 100 kg = 14 100 kg


(2) The sum of:

(i) taxi fuel; N/A
(ii) trip fuel to the destination 2 aerodrome, via the decision point;

Distance DEST-DP2-EA: 2000 NM + 400NM + 400 NM = 2800 NM
Flight time: 2800 NM / 400 kt = 7 h
FF: 2 000 kg/h

  • Therefore, Trip Fuel = 7 h x 2000 kg/h = 14 000 kg


(iii) contingency fuel equal to not less than the amount calculated in accordance with (a)(3)(*) above from departure aerodrome to the destination 2 aerodrome;

14 000 kg x 5% = 700 kg


(...)

FOR (b)(2) – we have a value of 14 000 + 700 kg = 14 700 kg


=> (b)(2) > (b)(1) => 14 700 kg > 14 100 kg => So our contingency fuel will be 700 kg in the second scenario.

  • We can conclude that Contingency will increase from 200 kg (From 1st Scenario, (b)(1)) to 700 kg (From 2nd Scenario, (b)(2)) => Total increase of 500 kg.

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