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Startup - DLC check


Golo

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DLC check can not be performed during startup checklist, because it will not actuate.

 

From NATOPS 01-F14AAP-1 checklists:

27. EMERGENCY WING SWEEP handle — 20°

28. MASTER RESET push button — Depress

29. External lights — Check

30. Flaps and slats — DN

31. Flight controls — Cycle

32. DLC — Check (Unable, can not actuate inboard spoilers with DLC button, interestingly enough horizontal tails do shift with DLC input if DLC was 

                                activated, its just the spoilers that wont pop up)

33. ANTI SKID SPOILER BK switch — SPOILER BK

34. Spoilers and throttles — Check (if DLC was not engaged moving throttles from idle will retract all spoilers, if DLC was engaged which we can not see now moving throttles from idle will retract outboard spoilers, inboard ones will remain in 17° up position - can be cleared by actuating DLC again or by advancing throttles to mil)

 

 

Note: Also as a side note, if you have flaps up and spoiler brake switch in position other than OFF, inboard spoilers will pop up (correct), but moving stick lateraly will not actuate outboard spoilers, which it should regardless of spoiler brake switch and/or flaps position, at least to my knowledge.  

OK scratch that, that is correct.


Edited by Golo
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  • Golo changed the title to Startup - DLC check
1 hour ago, Golo said:

And your point is?

That on DLC check you should indeed verify only horizontal tail shift with DLC input. Which you did confirm so I see no bug here.

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44 minutes ago, draconus said:

That on DLC check you should indeed verify only horizontal tail shift with DLC input. Which you did confirm so I see no bug here.

Yes I did check the tail movement, but inboard spoilers are supposed to pop up on pressing the DLC button on the stick so you can actually verify that they are working, not just the tail movement.

What would be the point of tail movement if the spoilers are not actuating with DLC imput, I would reject that plane after that kind of check, cos I would be unsure if it would operate during landing.

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Gents, we might have been a bit premature. 

 

The DLC does work if you select Gear Down and Spoiler Brk on (Both or Anti-skid), then bump the thrust off idle slightly to check Spoiler Brk operation, hold the slight thrust, now DLC on ground works and can be checked. 

 

Not sure if this is exactly as intended, but it satisfies my OCD for the moment. Could be an intentional and realistic change.

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The spoiler brakes should close if the throttle is advanced, so this is backwards of the correct behavior.

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3 hours ago, mattag08 said:

The spoiler brakes should close if the throttle is advanced, so this is backwards of the correct behavior.

Yeah they should, and still do. The spoiler brake operation is still correct. 
 

it’s just that the only way to check DLC operation on ground is now with a small off-idle thrust applied. Still don’t know if this is correct. 

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Its incorrect. Nowhere in NATOPS its says that DLC only works with "antiskid spoiler brakes" switch engaged. In fact its specifically says in pre-land descend checklist for CV landing that "antiskid spoiler brake" has to be OFF, and it also says to use DLC on CV landing.

 

 

This is the only requirement for DLC to work:

2.22.6 Direct Lift Control. During landing approaches, the spoilers and horizontal stabilizers can be controlled simultaneously to provide vertical glidepath
correction without changing engine power setting or angle of attack. Only the inboard spoilers are used for DLC.

 

Before DLC can be engaged, the following conditions are required:
1. Flaps down greater than 25°.
2. Throttles less than MIL power.
3. Inboard spoilers operational.
4. Pitch B and Yaw B computer segregations operational.
5. Operable combined hydraulic pump.

 

Edit: Any word from HB? I really hope it will get sorted out for that coming hotfix.


Edited by Golo
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The spoiler brk logic was mostly fixed now as far as I can tell but the DLC still doesnt operate on the ground. It's pretty minor and no one really "checks" that but it used to work in the past. Guess someway down the road HB received some false/confusing information which made them change the whole spoiler/DLC operation logic on the ground.

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Just ran some tests. The spoiler brake logic is correct now, DLC seems to work on the ground too but only with flaps full and power not in idle. This might be correct if you look at some field and carrier landings. With the spoiler brk. active DLC will only be active with power not in idle. 

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6 hours ago, Skysurfer said:

Just ran some tests. The spoiler brake logic is correct now, DLC seems to work on the ground too but only with flaps full and power not in idle. This might be correct if you look at some field and carrier landings. With the spoiler brk. active DLC will only be active with power not in idle. 

Thats not in conditions that are required for DLC operation, so I still consider it bug.

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  • 5 weeks later...
On 1/23/2021 at 6:28 AM, fat creason said:

This one should be fixed in the next patch.

Thx for the fix, I have one more issue/question about spoilers operation.

Right now if you are landing with flaps down, DLC engaged, and antiskid spoiler brake switch in position other than OFF (field landing), after touchdown (power - IDLE) DLC stays active (priority) and spoilers wont pop up until DLC is manually disengaged. I cant find any direct info about this, but I dont think that is correct.

 

I think if you have antiskid spoiler brake switch in other than OFF position, with WOW, it should have priority over DLC. Im not exactly sure of this but logically it makes sense to me. Other than that spoilers now function correctly as far as I can tell.

 

 


Edited by Golo
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22 minutes ago, Golo said:

Thx for the fix, I have one more issue/question about spoilers operation.

Right now if you are landing with flaps down, DLC engaged, and antiskid spoiler brake switch in position other than OFF (field landing), after touchdown (power - IDLE) DLC stays active (priority) and spoilers wont pop up until DLC is manually disengaged. I cant find any direct info about this, but I dont think that is correct.

 

I think if you have antiskid spoiler brake switch in other than OFF position, with WOW, it should have priority over DLC. Im not exactly sure of this but logically it makes sense to me. Other than that spoilers now function correctly as far as I can tell.

 

 

 

 

Yep, that is a new issue now, DLC on the gound overrides the spoiler brake, which it clearly shouldn't. 

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