LD handle / DN LOCK REL question
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With no power to the airplane the LD handle can be moved from down to up by holding the DN LOCK REL button which mechanically allows it. The handle should then get locked in the up position, right? Reading the -1 it sounds like it takes positive electrical power to unstick the handle from the up position but it doesn’t take power to get into it. I’m pretty confident of that but please correct me if I’m wrong.
OK the power is out and the handle is locked up and there’s no electrical way to get the handle down again… would pressing the DN LOCK REL button again allow the handle to go from up to down? From reading -1 the handle lock is referred to in the singular, i.e. sounds like there is only one handle lock which works for the up and down position only they have different electrical release criteria. The DN LOCK REL button says it mechanically releases “the” handle lock which sounds like it will allow the handle to be unstuck from the locked up position, yes?
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Do not worry, ED team have all the best SMEs they need … the same who said that some airframe “are”/“can be” wired for HARM on Stat 4/6 …
The same way some C-130 can fire AGM-114.
About the LG LOCK, let them search a little bit.
Normally, they have all they need. Few times I tried to gave them few clues. I earned penalties because I simply written : " TO 1F-16CM-34-1-1 " accused to make advertisements for another Sim.….
For recollection,
"TO 1F-16CM-34-1-1 " is the official (real) US F-16 avionic manual reference.
Do not confuse with "TO GR1F-16CJ-34-1-1 " which is the Greek one.
And mostly, not confuse with "TO BMS1F-16-34-1 " Which is indeed a “fake” manual for another “video game”. -
The handle is locked from transitioning from one end position to the other by a mechanical lock. A solenoid can retract the lock to let the lever move. The DN LOCK REL achieves the same task by acting (mechanically) directly where the solenoid does.
When the a/c takes off, the solenoid is energized on WOW off and you can move the LG up. To move the LG down you have to press the permission button.So, in both cases electrical power “unsticks” the handle, it’s just that to go up power is applied by the squat switch (WOW) going off but to go down you have to press the button yourself.
The handle activates switches on the DC Bus No 2. So, if there’s no power on the bus, moving the handle achieves nothing. The permission button, however, is powered by DC bus No. 1. So, if there power on DC bus 2 and not on 1, the permission button doesn’t work but if you use the DN LOCK REL and move the handle, the LG will move.
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Would an unpowered handle “click” into locked position (e.g. from middle to up or middle to down) or would the lock fail to engage without power? Dash-1 description sounds like it might click and lock from mid-to-down or mid-to-up but the mechanical override would get you out of either extreme.
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The lock is spring loaded so yes, it would “click”. But how would you get in the middle position in the first place? You lost power during the 0.1sec it takes to move the handle?
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From the pictures I’ve seen of RL Landing Gear boxes taken apart, it looks like the only “locking” of the handle is in the full up/full down position. All of the rest of the travel action is simply spring/cam/tension related. But once the internal solenoid releases the handle it’s free to move - which is why they lock it.
The real “problem” with the Landing Gear after losing power isn’t really the control box handle - it’s the possible loss of electrical power to operate the switching of valves that actually control moving the Landing Gear itself, and/or the proximity switches that provide feedback of the gear position.
It’s these prox switches in conjunction with the handle lock which also prevent the gear from coming up if weight is on wheels…unless you override them. And/or pull a few other tricks…which I know how to do for a few airplanes, for Maintenance reasons…but in the case of the Viper the pilot actually has an override button for the handle. Shudder…
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Guyz Guyz Guyz,
Ask LEECH.
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The lock is spring loaded so yes, it would “click”. But how would you get in the middle position in the first place? You lost power during the 0.1sec it takes to move the handle?
You get the handle in the mid position by the dnlockrel button.