Multi-engine Piston Aeroplane (MEP)

Introduction

Data sheets are provided for a multi-engine aircraft (MEP1). This is a monoplane with two reciprocating engines, twin counter-rotating constant speed propellers and a retractable undercarriage; similar to a Piper Seneca.

The Power Settings of 75%, 65% and 45% equate to High Speed Cruise, Economy Cruise and Long Range Cruise. You will note that there is a fourth power setting of 55% which has no cruise description.

The data sheets are used in a similar manner to those for SEP1. The following paragraphs explain the use of the data sheets.

NB. In the Flight Planning exam you will be issued with a workbook instead of the CAP 697 in which will be the necessary pages for that particular paper.

MEP 1-Fuel, Time and Distance to Climb Data

There are separate reference lines for time, distance and fuel to climb, but only one combined scale.

Climb Examples

1.Refer to CAP 697 Figure 3.1 Given: Airfield at MSL OAT +20°C Climb to FL120 OAT -10°C

What is the fuel, time and distance covered in the climb?

F T D

With a 35 kt tailwind; what is the ground distance covered in the climb?

2.Refer to CAP 697 Figure 3.1 Given: Airfield at 4000 ft OAT +0°C Climb to FL140 OAT -20°C

What is the fuel, time and distance covered in the climb?

F T D

FL140

4000 ft Difference

With a 40 kt headwind; what is the ground distance covered in the climb?

Multi-engine Piston Aeroplane (MEP) 5

(MEP) Aeroplane Piston engine-Multi 5

Answers to Climb Examples

1.Refer to CAP 697 Figure 3.1 Given: Airfield at MSL OAT +20°C Climb to FL120 OAT -10°C

What is the fuel, time and distance covered in the climb?

With a 35 kt tailwind; what is the ground distance covered in the climb?

45 NGM

2.Refer to CAP 697 Figure 3.1

Given: Airfield at 4,000 ft OAT +0°C Climb to FL140 OAT -20°C

What is the fuel, time and distance covered in the climb?

With a 40 kt headwind; what is the ground distance covered in the climb?

17 NGM

MEP 1-Range at Standard Temperatures

(CAP 697 Figure 3.2)

Two values of air range can be extracted, with either 45 MIN. RESERVE FUEL AT 45% POWER (left-hand side of graph) or WITH NO RESERVE (right-hand side of graph).

NB. On the top right side of the graph is a power phrase to percentage translation. Eg. Economy power is 65%.

You also should correct the air range in accordance with the notes at the top left-hand side of the graph. The corrections are to add 1 NM for every degree above ISA and subtract 1 NM for every degree below ISA.

Remember range is affected by wind so you might have to convert NAMs into NGMs. If this occurs you will be given a TAS and a Wind Component to apply the NAM/NGM = TAS/GS formula.