Engine Power Loss in Flight

A complete loss of power in flight is usually caused by an interruption of the fuel flow. The checklist attacks the fuel system first, then the engine gauges for a clue.

At a glance

• Trim for (power not restored)73 KIAS
• Minimum airspeed (power loss at low altitude)73 KIAS

The checklist

1. Fuel selector — SWITCH TO TANK CONTAINING FUEL

2. Electric fuel pump — ON

3. Mixture — RICH

4. Carburetor heat — ON

5. Engine gauges — CHECK for an indication of the cause

6. Primer — CHECK LOCKED

If no fuel pressure is shown, check that the tank selector is on a tank that contains fuel.

When power is restored

• Carburetor heat — OFF

• Electric fuel pump — OFF

If power is not restored, prepare for a power off landing and trim the airplane for 73 KIAS.

Low altitude

If the power loss happens at low altitude, the first job is to prepare for an emergency landing, holding at least 73 KIAS.

If time permits

• Ignition switch — L, then R, then back to BOTH.

• Throttle and mixture — try different settings.

• Fuel — try other tanks.

If water in the fuel is the cause, the fuel pressure indication will be normal. Letting the engine windmill may bring the power back.

Check yourself

• What usually causes a complete power loss in flight?

• List the six checklist items in order.

• Which two items are turned off once power returns?

• What speed do you trim for if power does not return?

• What fuel pressure indication suggests water in the fuel, and what may help?

Study aid — always fly your aircraft's current AFM/POH.