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Rotor brake lock startup


recoil17

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I understand the purpose of the rotor brake and the rotor brake lock but I'm having a hard time understanding a rotor brake lock startup. I understand the principals of how it works just not the reasoning to have such a system. 

 

What's the benefit to performing a rotor brake lock startup and why was it implemented in the Apache? 

"Simultaneous selection of fuel dump and afterburner during high AOA

maneuvering may cause fuel to ignite with resulting fuselage damage."

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I found (Rotorcraft Pro) a post - "

  On 9/10/2018 at 2:46 PM, Eric Hunt said:

Any damage would be uneven heating of the turbine wheels, with the hot gases only hitting a couple of parts of the wheels instead of being spread all over it. I have seen one person start a 206 and get to full throttle before he realised the blade was still tied down.

 

Yes, in the S-76 B it was accepted practice to start one engine with the brake on when the VIP passengers arrived in their car and boarded. Once they were inside, release the brake, spin up the rotor to 85%, and start the other engine.

 

//Rotor brake starts are accepted practice in the AH-64, though pretty rare for various reasons. Supposed to be a valid technique for shipboard or dusty area starts. Never heard that it was a maintenance problem as it is in ATM and therefore a normal/accepted startup procedure.///

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The purpose of a rotor brake start is to get the rotors spinning from zero to hero as quickly as possible to prevent excessive blade flapping (and possibly contacting the airframe) at low rotor speeds due to very windy/gusty conditions, such as those generally encountered during operations aboard a ship.

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