PPRuNe Forums - View Single Post - Bell 412 start and performance questions

17th Sep 2010, 14:37

#25 (permalink)

Troglodita

Join Date: Apr 2008

Location: Out of Africa

Age: 70

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The ******* Way

Engine starts

Bell Helicopters Textron has devised an alternate Engine Starting technique which has been adopted on all ******* operations. During the start procedure at 12%N1 with Engine Oil Pressure indicating, roll the throttle to slightly below the Flight Idle position (approx. 20 degrees - NG of ENGINE uppermost). If the ITT should rise rapidly during the start, control or "modulate" the temperature with the throttle. At approximately 45% N1, the throttle will need to be advanced slightly to increase the N1 to 61%.
This technique allows a pilot to abort a start at anytime with a simple "off" movement of the throttle to the cut-off position, even if electrical power fails.
Pilots must ensure correct internal battery or external power limitations prior to start.

Trog.

P.S Helibuoy - why would you worry about the WAT graphs for the FM Category A Runway (Part C) profile? you wouldn't ever consider using those - would you?

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