Descent Table

(Refer CAP 697 MRJT1 Figure 4.5.4a & 4.5.4b)

Time, fuel and distance (NAM) for a flight idle thrust descent are tabulated for:

•M 0.74/250 KIAS, which approximates to an economy descent, and

•M 0.70/280 KIAS, turbulent air penetration descent.

Allowances are included for a straight in approach with undercarriage down.

Increase fuel during the descent by 50 kg for engine anti-ice.

Example 5

Given a landing weight of 54 900 kg and a mean descent wind component of 50 kt head calculate the time, fuel and ground distance for a M 0.74 descent from FL330.

Example 6

An aircraft with an estimated landing weight of 48 500 kg descends from FL310 to fly a straight in approach, through turbulent air with the engine anti-ice on; the wind component is 45 kt tail. Calculate the fuel burn, time and ground distance

Answers to Examples 5 and 6 are on page 104

Medium Range Jet Transport (MRJT) Detailed Flight Planning 7

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INTEGRATED FLIGHT PLAN - EXERCISE 1

Exercise 1

Complete the Integrated Flight Plan from the following data:

Long Range Cruise flight at FL370 from A to E with a nominated alternate airfield. Airfield elevation at A is 3000 ft;

Mean sea level at E and the Alternate.

The gross take-off weight(mass) at A is 56 000 kg.

The estimated landing weights at E and the alternate are 46 000 kg and 43 000 kg.

Use 47 000 kg as the start weight for the hold.

When the plan is completed answer the following:

a.Assuming that the contingency and holding fuel are unused, what is the estimated landing weight at the Alternate?

b.At a cruise weight of 56 000 kg what is the optimum LRC/M 0.74 level?

c.The aircraft’s track is 180°(T) and variation 10°E. The lowest optimum IFR cruise level is?

d.If the variation was 10°W what is the amended lowest optimum IFR level?

e.If the gross brake release weight is 46 000 kg, trip distance 150 NAM and temperature ISA +10°C, what is the short distance cruise?

Questions 7

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