Ground check and pre-take off Flashcards
Why do we do this check?
2 reasons:
Check engines
Prepare acft for takeoff
THIS IS A MEMORY CHECKLIST
When is it necessary to say it?
Once we arrive at the holding point of the rwy in use
Should we turn the acft?
Yes, into the wind, with an angle no more than 45º
Must always do this if the wind is greater than 10 kts
In any other case:
Orient acft so that we have the final approach in sight
How many steps are there in this check?
16
1
Parking brake: SET
2
Taxi light: OFF
3
Engine parameters within normal limits (we should not begin check until engine oil temperature is in the green arc)
4
Mixture: FULL RICH
5
Throttles: 1900 RPM
6
Check smooth operation of the engine with the left and right magnetos:
Maximum drop of RPM in each case should not be more than 150 RPM,
Maximum difference between magnetos should not be more than 50 RPM
7
Propeller COARSE - PITCH - FWD
Maximum drop of 300 RPM when checking the props, at least three times to allow a correct oil mixture in the governor.
Use three movements to check:
- feathering of the propeller:
- RPM's drop,
- MAP of the engine rises
- Slight indication of a drop in oil pressure and that no oil has been lost by the governor unit of the engine
Then move propeller control lever back to its initial position
Repeat this with the second engine
7
Check alternate air of the engines. This verifies engine do not suffer because of bypassing the air filter.
- Select the alternate air level of each engine in the ON position for a few seconds - Return them to the OFF position before takeoff
8
Check correct operation of alternators and ammeters
- Disconnect one of the alternators and check that the ammeter fails to indicate a drop in the same alternator you are checking, and that the other alternator is taking the load (max 60 Amps)
- Check annunciator warning panel lights of GEN or ALT are on, then reconnect the alternator and check the power consumption and that the warning light goes out.
- Repeat this process with the other alternator.
What do you do in order to not damage the alternators?
the first flight of the day we will check the ammeter by increasing the eletrical charge:
- turning on the landing lights and pitot heat, check how the increased indications affect the ammeters
9
Vacuum pressure within limits:
4-5 and 5 2 ‘’ of Hg and that neither of the red lights appear and that the two pumps work correctly
10
Check that the engine parameters are within their normal limits
- EGT
- Oil pressure
- Oil temperature and fuel flow
11
Adjust throttles on both engines to 1000 RPM
12
Check correct movement of the propeller:
- Move level back to the rearmost position (into the feather area)
- Wait a few moments to check that the revolutions drop below 800 RPM’s (do not let the revolutions drop more than 300 RPM and then return to level to the “FULL FORWARD”.
- If you need to help to advance the propeller, add a bit of power
