19 ms·
> Or at least, as long as the bearings don’t fail. If the bearings fail, counteracting torque is the least of your worries - you should land immediately before
by daniel-thompson 6y ago
> Or at least, as long as the bearings don’t fail.
If the bearings fail, counteracting torque is the least of your worries - you should land immediately before the rotor shits itself and you turn into a flaming lawn dart. From the UH-60 operator's manual:
> 9.22.10 Main Transmission Failure.
> WARNING
> If % RPM R decreases from 100% to below 96% with an increase in torque during steady flight with no engine malfunction, the main transmission planetary carrier may have failed. During a main transmission planetary carrier failure, it may be impossible to maintain % RPM R at 100%.
> NOTE
> Decreasing % RPM R may be accompanied by a drop in transmission oil pressure of 10 psi or more, and possible unusual helicopter vibrations.
> PROCEDURE
> 1. Collective - Adjust only enough to begin a descent with power remaining applied to the main transmission throughout the descent and landing.
> 2. LAND AS SOON AS POSSIBLE.
- hinkley 6y agoI like to keep people guessing by alternating between ironic understatement and hyperbole. Too much BBC perhaps. I know in low rpm devices, especially with radial forces (wheels) a bearing or race can start to go without destroying the whole assembly. To the point that bicyclists can bring in a wheel that's so far gone that the labor to fix it is twice the cost of a new wheel (I can fix this or we can get you a new pair of wheels for the same price, installed). How long do you have between the first chip and game over on a rotor? Some how, even though "LAND AS SOON AS POSSIBLE" is in all caps, I doubt it entirely captures the urgency. If anything involved with keeping the blades attached fails, sounds like a case of any other plans you had are over and you need to be on the ground RFN while it's still a choice.