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2 Answers

Failed starting

Asked by: 1259 views Aircraft Systems

i have the failed starting procedure TB-9 aircraft like below.

1. MIXTURE--------IDLE CUT-OFF

2. THROTTLE------- FULL POWER

3. MAGNETO/START SELECTOR-------START

i think the reason we have to do this procedure is over priming or something.

what is the point of this procedure?

i don't understand why mixture should be that position.

 converserly, throttle as well.

it is driving me bananas.

 

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2 Answers



  1. Jim F. on Mar 17, 2013

    If you read the note prior to that procedure list, it states: “Failed starting may be due to excess fuel resulting from repeated injection producing black smoke and back fire.”

    So by following the recommended procedure, you’re cutting off all fuel to the engine. By continuing cranking the engine, you’re purging/burn all remaining fuel from the cylinders so you avoid possible back firing and engine damage.

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  2. John D. Collins on Mar 17, 2013

    I don’t have the POH available or know the engine, but would guess it is a procedure used when the engine is flooded and does not need priming. The reason the throttle is full open is to provide sufficient air to mix with the gas until the mixture is OK for combustion. The lean mixture setting prevents additional fuel to be added prior to starting as the engine already has too much gas. Once the engine starts, the normal procedure is to retard the throttle and push in the mixture to keep the engine running.

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