Multi-engine Piston Aeroplane (MEP) |
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Range Examples
3. |
Refer to CAP 697 Figure 3.2 Range with reserves Range no reserve |
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Given: Economy @ FL100 ISA |
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Given: LRC |
@ FL140 ISA |
Answers to Range Examples
3. |
Refer to CAP 697 Figure 3.2 |
Range with reserves |
Range no reserve |
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Given: Economy @ FL100 ISA |
760 |
850 |
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Given: LRC |
@ FL140 ISA |
930 |
1040 |
MEP 1-Cruise Power Setting and Fuel Flow
(CAP 697 Figure 3.3)
Power settings are expressed as 75% (HIGH SPEED), 65% (ECONOMY), 55% AND 45% (LONG RANGE). TAS is extracted from the SPEED POWER table, figure 3.4.
Enter the table with the required % power to obtain fuel flow in US.gal/h
For example: Economy Power (65%) has a fuel flow of 23.3 US.gal/h. Given a time let us say of 2 hours 30 minutes you can work out a trip fuel of 58.25 US.gal.
The manifold pressure is read off against pressure altitude and rpm in the correct % power column
Note that, for example, 75% power and a fuel flow of 29.0 GPH should be achieved at FL60 at:
•33.4 inHg @ 2500 rpm, or
•32.2 inHg @ 2600 rpm.
Also, that the fuel flow decreases as power decreases, thus giving greater range and endurance.
To correct for temperatures different from ISA:
For each 6°C above ISA, add 1% to tabulated manifold pressure.
For each 6°C below ISA, subtract 1% from tabulated manifold pressure.
Unlike the SEP power graphs the TAS is NOT extracted here, so a separate graph is provided for you to get your TAS.
Multi-engine Piston Aeroplane (MEP) 5
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(MEP) Aeroplane Piston engine-Multi 5
MEP 1-True Airspeed
(CAP 697 Figure 3.4)
This graph is used to obtain the TAS for the various temperature, altitude and % power setting combinations in the cruise configuration.
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Examples of extraction of TAS |
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4. |
Refer to CAP 697 Figure 3.4 |
TAS |
Given: High Speed@ FL120 ISA
Given: Economy @ FL120 ISA
Given: LRC @ FL120 ISA
Given: Economy @ FL80 OAT +20°C
Given: Economy @ FL80 OAT -20°C
Answers toTAS Extractions
4. |
Refer to CAP 697 Figure 3.4 |
TAS |
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Given: High Speed @ FL120 ISA |
183 |
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Given: Economy @ FL120 ISA |
178 |
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Given: LRC @ FL120 ISA |
146 |
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Given: Economy @ FL80 OAT +20°C |
176 |
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Given: Economy @ FL80 OAT -20°C |
166 |
MEP 1-Endurance
(CAP 697 Figure 3.5)
The endurance in hours can be obtained either with the 45 MIN. RESERVE FUEL AT 45% POWER (left-hand side of graph) or WITH NO RESERVE (right-hand side of graph)
Endurance Examples
5. Refer to CAP 697 Figure 3.5 Safe Endurance Total Endurance Given: High speed @ FL100
Given: Economy @ FL100 Given: LRC @ FL100
Answers to Endurance Examples
5. |
Refer to CAP 697 Figure 3.5 |
Safe Endurance |
Total Endurance |
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Given: High speed @ FL100 |
3.6 h (3:36) |
4.1 h (4:06) |
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Given: Economy @ FL100 |
4.5 h (4:30) |
5 h |
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Given: LRC @ FL100 |
6.4 h (6:24) |
7.2 h (7:12) |
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Multi-engine Piston Aeroplane (MEP) |
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MEP 1-Descent Fuel, Time and Distance
(CAP 697 Figure 3.6)
This table works in the same way as the climb table in that one entry will give the fuel, time and distance to descend from a pressure altitude (FL) to MSL. If the destination airfield is not at MSL, then a second entry is needed to extract data for a hypothetical descent from airfield FL to MSL. This data is subtracted from the former to give the actual descent fuel, time, distance.
Descent Example
6.Refer to CAP 697 Figure 3.6
Given: Descend from FL120 OAT -20°C To airfield at 4000 ft OAT +0°C
What is the fuel, time and distance covered in the descent?
F T D
FL120 4000 ft Difference
With a 20 kt headwind; what is the ground distance covered in the descent?
Answers to Descent Examples
6.Refer to CAP 697 Figure 3.6
Given: Descend from FL120 OAT -20°C To airfield at 4,000 ft OAT +0°C
What is the fuel, time and distance covered in the descent?
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FL120 |
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12 |
32 |
4000 ft |
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4 |
10 |
Difference |
2 |
8 |
22 |
With a 20 kt headwind; what is the ground distance covered in the descent?
19 NGM
Multi-engine Piston Aeroplane (MEP) 5
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(MEP) Aeroplane Piston engine-Multi 5
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Airfield “A” Data |
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Airfield “D” Data |
Cruise Data |
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Exercise MEP |
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Elevation MSL |
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Elevation MSL |
TOC to B - High Speed Cruise |
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Temp +15°C |
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Temp +15°C |
B to C - Economy Cruise |
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Aircraft departs “A” at 11:30 |
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C to TOD - Long Range Cruise |
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Calculate the Trip Fuel, Time En route and ETA “D” |
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FL |
OAT |
W/V |
TAS |
NGM |
TK |
HDG |
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TIME |
FUEL |
FUEL |
ETA |
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FLOW |
REQD |
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A |
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TOC |
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0°C |
120/20 |
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70 |
115 |
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TOC |
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FL100 |
- 4°C |
150/30 |
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115 |
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B |
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C |
FL120 |
- 10°C |
170/40 |
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150 |
270 |
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C |
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TOD |
FL100 |
- 6°C |
140/30 |
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305 |
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TOD |
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0°C |
120/20 |
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305 |
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TOTALS |
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300 |
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5 Questions 69
Questions 5
Answers |
5 |
70
Airfield “A” Data |
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Airfield “D” Data |
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Cruise Data |
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Elevation MSL |
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Elevation MSL |
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TOC to B - High Speed Cruise |
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Temp +15°C |
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Temp +15°C |
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B to C - Economy Cruise |
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Aircraft departs “A” at 11:30 |
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C to TOD - Long Range Cruise |
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Calculate the Trip Fuel, Time En route and ETA “D” |
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FROM |
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FL |
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OAT |
W/V |
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TAS |
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NGM |
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TK |
HDG |
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TIME |
FUEL |
FUEL |
ETA |
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FLOW |
REQD |
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A |
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TOC |
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0°C |
120/20 |
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115 |
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11:46 |
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TOC |
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FL100 |
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- 4°C |
150/30 |
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180 |
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115 |
121 |
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155 |
18 |
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8.7 |
12:04 |
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B |
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C |
FL120 |
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- 10°C |
170/40 |
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150 |
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270 |
257 |
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180 |
50 |
23.3 |
19.4 |
12:54 |
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C |
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TOD |
FL100 |
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- 6°C |
140/30 |
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305 |
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171 |
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4.8 |
13:12 |
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TOD |
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0°C |
120/20 |
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305 |
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13:22 |
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TOTALS |
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300 |
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112 |
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45.9 |
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Answers 1 Exercise MEP
Answers 5