Worksheet: PET 2 – LMS | INSIGHT AVIATION

Results

📄 Notes

Q1. An aircraft is flying from A to B a distance of 550 NM, Track 304°, W/V 265/35. Full TAS 210 kt engine failure TAS 180 kt. Calculate the PET, in the case of engine failure, as a distance from A .

240 NM

291 NM

308 NM

259 NM

From A to B: TAS 180, W/V 265/35, Track 304°, GS 151(O), Dist 550 NM
From B to A: TAS 180, W/V 265/35, Track 124°, GS 206(H), Dist 550 NM
Calculation: (550 x 206) / (151 206) = 317 NM

Q2. An aircraft i s flying from A to B a distance of 284 NM, Track 117°, W/V 345/30. Full TAS 225 kt engine failure TAS 190 kt. Find the PET between A and B in the case of engine failure.

124 NM

131 NM

142 NM

119 NM

From A to B: TAS 190, W/V 345/30, Track 117°, GS 209(O), Dist 284 NM
From B to A: TAS 190, W/V 345/30, Track 297°, GS 169(R), Dist 284
Calculation: (284 x 169) / (209 169) = 127 NM

Q3. An aircraft is flying from A to B a distance of 615 NM, Track 244°, W/V 065/40. Full TAS 212 kt engine failure TAS 185 kt. Give the PET, in the case of engine failure, as a distance from A

254 NM

307 NM

361 NM

240 NM

From A to B: TAS 185, W/V 065/40, Track 244°, GS 225(O), Dist 615
From B to A: TAS 185, W/V 065/40, Track 064°, GS 145(R), Dist 615
Calculation: (615 x 145) / (225 145) = 241 NM

Q4. Calculate distance from A to one engine out PET. (A-B Dist 2500, Tcrs 090, W/V 120/60, 4-Eng TAS 400, 3-Eng TAS 320)

1453 Nm

1254 Nm

1384 Nm

1524 Nm

1453 Nm

Calculate 3-engine groundspeeds for out and home legs using Tcrs 090 and W/V 120/60.

Apply PET formula: (Total Distance * GS Home) / (GS Out + GS Home).

Using 3-engine speeds, the distance from A to the PET is 1453 NM.

Q5. If an engine fails Just at engine failure PET then how many minutes it will take to return home. (Dist 1400, W/V 120/40, 2-Eng TAS 220, 1-Eng TAS 120)

365

366

364

365

Identify the engine failure PET by using 1-engine failure speeds for both Out and Home legs.

Determine the distance from Departure A to this specific engine failure PET.

Calculate time to return to A using the 1-engine GS Home speed.

The total return time is 365 minutes.

Q6. If an engine fails at Just at engine failure PET then how many minutes it will take to return home. (Dist 1600, 2-Eng TAS 240, 1-Eng TAS 130, Wind -50/+45)

376

377

375

376

The Distance from Departure A to the engine failure PET is 1098.03 NM.

The return time is calculated using the 1-engine TAS (130 kt) adjusted for the home wind component (+45 kts).

Total time to return home is 376 minutes.

Q7. Calculate time in minutes to reach B from one engine out PET with all engine operative speed. (Dist 3600, 4-Eng TAS 460, 3-Eng TAS 340, Wind -30/+60)

219

218

220

219

The engine failure PET (based on 3-engine speeds) is 2028.16 NM from Departure A.

Remaining distance to Destination B: 3600 – 2028.16 = 1571.84 NM.

Time to reach B at all-engine operative speed (4-engine GS of 430 kts): 1571.84 / 430 = 219 minutes.

Q8.
Actual Time of Departure (ATD): 11:05
Cruising Speed: CAS 190 kt
Altitude/Temp: 9000 ft / ISA -10°C
Wind/Course: 320°/40 kt / 350°
What is the Estimated Time of Arrival (ETA) for the Point of Equal Time (PET)?

12:49

12:13

11:55

12:26

12:13

Step 1: Determine Groundspeed Using the provided TAS (approx. 215 kt derived from 190 CAS at 9000 ft) and the headwind component from the 320°/40 kt wind on a 350° course, the Groundspeed Out (GS_O) is calculated as 180 kt.

Step 2: Calculate Time Interval Apply the formula: Time = Distance / Speed. Using the PET distance of 204 NM and GS_O of 180 kt: Time = 204 / 180 = 1.133 hours.

Step 3: Convert to Minutes 1.133 hours x 60 minutes = 68 minutes (or 1 hour and 08 minutes).

Step 4: Determine ETA Add the flight duration to the Actual Time of Departure (ATD): 11:05 01:08 = 12:13.

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